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20 June 2016, Volume 35 Issue 3 Previous Issue    Next Issue
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Bridge & Tunnel Engineering
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Bridge & Tunnel Engineering

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Alignment Adjustment Method of Concrete Filled Steel Tubular Arch Bridge in Arch Rib Hoisting HAO Niebing, GU Anbang 2016, 35(3): 1-5.  DOI: 10.3969/j.issn.1674-0696.2016.03.01 Abstract ( )   PDF (1204KB) ( )   In order to solve the linear alignment adjustment of concrete filled steel tubular (CFST) arch bridge in arch rib hoisting process, the calculation method of real linear alignment and linear deviation adjustment of arch rib was studied. Through the analysis on the influence factors for arch rib alignment errors, the calculation function of real linear alignment was put forward. On the foundation of current research, according to alignment adjustment value, a feasible and optimal solution calculation method was proposed and the arch rib alignment adjustment value was calculated. The proposed method was applied to Bosideng Bridge, whose alignment error after adjustment was in allowable range of regulation. References | Related Articles | Metrics

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Stress Modification of Bridge Construction Based on the In-situ Experiment of Bridge XIANG Zhongfu, RAN Xu, LAI Li 2016, 35(3): 6-10.  DOI: 10.3969/j.issn.1674-0696.2016.03.02 Abstract ( )   PDF (2200KB) ( )   In view of the identification demand of structure real stress in the process of concrete bridge construction, no-stress sensor components were embedded in the bridge through the field test and in-situ test. And the temperature and shrinkage creep effects in concrete strain increments measured by string vibration sensor were modified effectively. A method to take off the temperature free strain and shrinkage creep of concrete was researched. Finally, the relationship between strain increments and concrete stress-strain was found out to develop a practical method to monitor the real stress in construction process of concrete bridge and to guide the modification of the stress measured by string vibration sensor. References | Related Articles | Metrics

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Modal Parameter Identification of Bridge Structure Based on Adaptive EEMD and Blind Identification Algorithm CHEN Yonggao 2016, 35(3): 11-16.  DOI: 10.3969/j.issn.1674-0696.2016.03.03 Abstract ( )   PDF (1837KB) ( )   Due to the defects of ensemble empirical mode decomposition (EEMD) in signal pretreatment, a blind source separation algorithm based on adaptive EEMD decomposition was proposed, that was: firstly, the amplitude standard deviation and integration times of the added white noise were confirmed according to the characteristics of the original signal, and then a EEMD decomposition was carried out; secondly, a fuzzy comprehensive evaluation on the obtained IMF components was carried out to select out the effective components of the IMF, and then IMF component matrix was established; finally, blind source separation algorithm was used for blind identification, and the signal decomposition and reconstruction was completed. The proposed algorithm was verified by analog signal and measuring vibration signal of bridges respectively. The results show that the proposed algorithm is feasible and can be applied to the signal preprocessing of actual structure. References | Related Articles | Metrics

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Disease Cause of Severe Deviation of Transfer Piers of Continuous Beam Bridge TIAN Shiqing, WANG Junxin, SHI Qingfan 2016, 35(3): 17-21.  DOI: 10.3969/j.issn.1674-0696.2016.03.04 Abstract ( )   PDF (1954KB) ( )   According to the investigation results of the installation defects of basin rubber support and deviation disease of transfer piers, the causes of severe deviation disease of transfer piers of continuous beam bridge were revealed by the analysis on the data of 39 bridges, 130 bridge piers and 1 268 supports at the construction site and the anatomy analysis on some damaged supports. The analysis indicates that the deviation damage is easy to occur at transfer piers of the continuous beam bridge in such cases, the un-horizontal installation of bearing support surface, the large deviation of the installation of the support roof and support center and under the combined action of the force of the beam expansion under the temperature difference. References | Related Articles | Metrics

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Engineering Application Effect of FRP Sidewalk Railing in the Bridge CUI Xuechang, ZHANG Xixiang, WU Zulie 2016, 35(3): 22-26.  DOI: 10.3969/j.issn.1674-0696.2016.03.05 Abstract ( )   PDF (2795KB) ( )   The novel study results of engineering application effect for a new type of fiber reinforced polymer (FRP) sidewalk railings in the bridge were introduced, which was based on the structure form design, structure stressing calculation, structure model experiment and engineering application test of the real railing in the bridge. The structure form of this new type of FRP railing was a fenced one made of FRP pultrusion standard components within a tenon riveting joint process. The proposed railing had advantageous structure effect, such as simple structure form, the reduced self-weight, the improved security in the case of overloading, as well as the free and unmarked deformation under temperature variation. It had advantageous function effect of beautiful appearance, excellent corrosion resistance and cleaning performance. It also had advantageous construction effect of highly industrialized process and strong controllability of quality and duration; meanwhile, it had advantageous economic effect of reasonable engineering cost and economized maintenance and conservation cost in the service time. This new type of railing is of both significant technological and economic advantages, especially for those bridges in corrosive medium environment and with difficulties or higher costs in the post maintenance and conservation. References | Related Articles | Metrics

Highway & Railway Engineering

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3D Finite Element Analysis of Temperature Field and Temperature Stress of Semi-rigid Asphalt Pavement Structure in Gansu Province GUO Yinchuan,WANG Ligen, SHEN Aiqin, GU Pinpin, WAN Chenguang 2016, 35(3): 27-32.  DOI: 10.3969/j.issn.1674-0696.2016.03.06 Abstract ( )   PDF (2455KB) ( )   Based on the semi-rigid base asphalt pavement with serious transverse crack in Gansu province, the temperature field and temperature stress of semi-rigid base asphalt pavement in this area were analyzed. With the help of ANSYS finite element software, the three-dimensional finite element model of semi-rigid asphalt pavement structure in Gansu was established and the heat loadings, such as the temperature and solar radiation, were applied. The variation rule of temperature field and temperature stress of semi-rigid asphalt pavement in Gansu was obtained by the solution, which provided some referential opinions to the designation of semi-rigid base asphalt pavement structure in Gansu. The results show that the change of the asphalt layer thickness has a great influence on the temperature stress and temperature field; the difference of temperature between the top and bottom of asphalt layer is increased with the increase of asphalt layer thickness, while the gradient of temperature distribution in the asphalt layer decreases with the increase of asphalt layer thickness; the asphalt surface layer is thicker, the faster the temperature stress of the upper half of asphalt layer diffuses, and the more slowly the temperature stress of the bottom half of asphalt layer diffuses. References | Related Articles | Metrics

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Interlayer Mechanical Strength of Base-Surface Layer of Semi-Rigid Base Asphalt Paiement TANG Yu, WU Guoxiong, CHEN Qiang, LI Qingjie 2016, 35(3): 33-37.  DOI: 10.3969/j.issn.1674-0696.2016.03.07 Abstract ( )   PDF (2164KB) ( )   In the semi-rigid base asphalt pavement, the performance of semi-rigid base and asphalt mixture layer are very different, so the interlayer connection between base layer and surface layer is crucial. The stress of base-surface layer was analyzed through BISAR software, and the law of interlayer shear and normal stress influenced by the change of the modulus and thickness of base layer and surface layer was acquired. Then a self-made fixture was used to carry out the base-surface layer shear test. The relationship between interlayer shear stress of base-surface layer and shear rate and test temperature change was researched. It is indicated by regression that the interlayer shear stress of pavement structure has good correlation with shear rate and test temperature. References | Related Articles | Metrics

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Deformation Properties of MSWI Mixed Soil under Cyclic Dynamic Loading GU Huanda, LI Cui , XUE Guoqiang 2016, 35(3): 38-42.  DOI: 10.3969/j.issn.1674-0696.2016.03.08 Abstract ( )   PDF (2092KB) ( )   Based on the effective utilization of MSWI in road base course, a series of cyclic dynamic loading tests in laboratory were carried out in order to evaluate the deformation properties of MSWI mixed soil. It is indicated by test results that: MSWI mixed soil does well in reducing the accumulative plastic deformation and elastic deformation of under cyclic dynamic loading with reasonable mixing ratio of MSWI, comparing with cement treated soil or compacted soil. Thereby, MSWI mixed soil can be expected to improve the performance of resistant ability in fatigue damage or the durability of road. References | Related Articles | Metrics

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Graphic Design Method for the Non-Standard Rapid Exit Taxiway LI Mingjie, 2016, 35(3): 43-46.  DOI: 10.3969/j.issn.1674-0696.2016.03.09 Abstract ( )   PDF (1113KB) ( )   A non-standard rapid exit taxiway design method was proposed to solve the problem of the airport when the horizontal spacing between the parallel taxiway and runway did not meet the standard rapid exit taxiway design requirements. Firstly, the design of non-standard rapid exit taxiway from the runway to the parallel taxiway was divided into three parts, named as taxing in section, tangent section and turnoff section. Secondly, the non-standard rapid exit taxiway configuration schematic was drawn,and the calculation method of key parameter at each section was given, with the comprehensive consideration of both the safety and efficiency of aircraft operations. Finally, taking the 120 m spacing between the runway and the parallel taxiway of acertain airport for example, the coordinate values of the key points were calculated and the feasibility of the proposed method was verified, which provided some referential value for the airport graphic design. References | Related Articles | Metrics

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Research and Application of Multi-point Interrelated Movement Model of Highway Settlement HUANG Guobin 2016, 35(3): 47-49.  DOI: 10.3969/j.issn.1674-0696.2016.03.10 Abstract ( )   PDF (1863KB) ( )   According to the interrelated characteristics of the settlement of different measuring points and the basic principle of the grey system theory, the multi-point interrelated movement model of highway settlement was studied by taking advantage of the grey relational analysis and modeling of the “poor information”. The model was used to analyze the interaction of different settlement points, inspect the quality of settlement monitoring results and describe the settlement variation rule of the whole roadbed, and it could also be used to forecast the settlement of measuring points. In the light of settlement monitoring data of a certain highway, the multi-point interrelated movement model of settlement was established. The calculation results prove that the settlement variation of different measuring points has consistency and correlation, and the multi-point interrelated movement variation of highway settlement is reflected sufficiently. References | Related Articles | Metrics

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Urban Road Lighting Effect on Clear and Rainy Days HAN Shuai, LU Xi, DING Yifeng 2016, 35(3): 50-53.  DOI: 10.3969/j.issn.1674-0696.2016.03.11 Abstract ( )   PDF (1177KB) ( )   To study how different weather and light sources affected the actual road lighting effect, the field measurements on two adjacent arterial roads which located in center region of a city but used different light sources were carried out on clear and rainy days. Indicators, such as average luminance, luminance uniformity, average brightness, brightness uniformity and surround ratio were compared with Chinese national standard and analyzed. Finally, combined with the surround environment of roads, some suggestions on the lighting facilities of the two roads were proposed to meet the user’s visual effect and realize the target of energy conservation and emission reduction. References | Related Articles | Metrics

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An Estimation Method of Engineering Cost Based on Adaboost and Variable Selection with LSSVM HUANG Wentao, ZHOU Ping, CHENG Jinxiang 2016, 35(3): 54-57.  DOI: 10.3969/j.issn.1674-0696.2016.03.12 Abstract ( )   PDF (2013KB) ( )   To realize the fast and accurate prediction of construction engineering cost by using less engineering information, a novel estimation method of engineering cost based on Adaboost-VIP was proposed. Firstly, variable importance in projection (VIP) method was used to extract the multiple factors affecting the engineering cost, and then least squares support vector machine (LSSVM) was used as a nonlinear approximation to establish the estimation model of engineering cost. In order to further improve the estimation precision of the model, Adaboost method was combined with VIP. Some weak predictors were integrated by Adaboost and then a strong predictor was obtained. Meanwhile, the method was applied to the case study of construction. The results indicate that: variable importance in projection method can effectively choose the key influence factors and simplify the structure of the model; compared with the single engineering cost estimation model, the Adaboost-VIP model has higher estimation performance. References | Related Articles | Metrics

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Influence of Seasonal Rainfall Changes on Subgrade Settlement during Operation of High-Speed Railway in the Yangtze River Delta CUI Shuzhe, ZHOU Jinguo 2016, 35(3): 58-60.  DOI: 10.3969/j.issn.1674-0696.2016.03.13 Abstract ( )   PDF (2029KB) ( )   Firstly, the influence factors of the inhomogeneous subgrade settlement of high-speed railway were listed and analyzed. With the monitoring data of typical subgrade settlement of high-speed railway in the Yangtze River Delta and the time variation data of seasonal rainfall at the correspondingly monitoring region, the internal relation between the inhomogeneous subgrade settlement of high speed railway and the changes of subgrade moisture content and seasonal rainfall was analyzed. The studies show that seasonal rainfall results in the water content increase of embankment and subgrade in monitoring area, which changes the internal mechanical properties and causes the settlement. Therefore, the settlement during operation of high-speed railway subgrade in monitoring area presents seasonal characteristics with the annual rainfall variation. The above conclusion provides a useful reference for railway subgrade treatment and other rail maintenance. References | Related Articles | Metrics

Port & Waterway · Hydraulic & Hydroelectric · Resources & Environment

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Potential Channel Dimensions Improvement of Dongxikou Channel in Yangtze River Upstream CHEN Jian 2016, 35(3): 61-65.  DOI: 10.3969/j.issn.1674-0696.2016.03.14 Abstract ( )   PDF (2317KB) ( )   Taking typical Dongxikou channel in Chongqing-Yibin reach as an example, the problem of potential improvement of channel was analyzed through analyzing the field data of Dongxikou channel. The possibility of improving the class of Dongxikou channel was analyzed through the estimation of its channel potentiality, the study on the mathematical model of preliminary renovation project and the analysis of external construction conditions. The research shows that the stable depth of Dongxikou channel can reach 4.39 m; heightening and lengthening the moraine tail dam of Miaojiaoqi and opening the north branch of Dongxikou is recommended program; and the most negative flow index for upper reach is 1.45‰*3.10m/s. The regulation results show that the waterway regulation project has no significant impact on the environment, water sources, the related facilities and other aspects, which is feasible to be implemented. References | Related Articles | Metrics

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Flow Pattern Characteristics Analysis and Water Quality Simulation of River with Ecological Concrete Revetment JIANG Bin, WU Yifeng, HUANG Fumin, ZHU Jianguo, ZHONG Zhaoping 2016, 35(3): 66-70.  DOI: 10.3969/j.issn.1674-0696.2016.03.15 Abstract ( )   PDF (1155KB) ( )   A contrasted experiment was conducted in two river models, which were respectively built by common concrete and ecological concrete. The experiment results indicate that roughness coefficient of ecological concrete revetment is greater than that of hard revetment. When ecological concrete is adopted in the design of river ecological restoration project, the appropriate roughness coefficients for the design should be more than 0.088. The pollutant characteristic factors, such as NH3-N and TP, can be well simulated in the biological and ecological water quality comprehensive model of the river with ecological concrete revetment. Removal efficiencies for different pollutants can be effectively identified by using different simulation parameters. References | Related Articles | Metrics

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Experimental Study on Protection Effect of Flow-Altering Countermeasures against Clear Water Scour at Bridge Piers FANG Shilong, CHEN Hong, SHI Xiaofei 2016, 35(3): 71-77.  DOI: 10.3969/j.issn.1674-0696.2016.03.16 Abstract ( )   PDF (1659KB) ( )   The flow-altering countermeasures can effectively curb the bed sediment erosion by changing the hydrodynamic conditions around the piers, which has a good protective effect and application value. However, there has not been systematic study on its scour protection effects and characteristics yet. Therefore, the classic flow-altering countermeasures such as the horizontal collar, bridge piers slot, footing caisson, sacrificial piles, embedded sill and embedded vanes were systematically studied by means of the indoor variable slope flume test. The influence rule of geometric layout parameters of the flow-altering countermeasures on the reduction efficiency of the equilibrium maximum scour depth was also studied. The protection effect and protection characteristics of these classical flow-altering countermeasures against the clear water scour were deeply analyzed from the mechanism. The research results can offer some references for the choice and optimal design of the flow-altering countermeasures. References | Related Articles | Metrics

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Stability of Bedding Rock Slopes Based on Improved Water Pressure Distribution LIU Mingwei, GAO Pan, YU Jie 2016, 35(3): 78-81.  DOI: 10.3969/j.issn.1674-0696.2016.03.17 Abstract ( )   PDF (1980KB) ( )   Based on the assumption of different water pressure distribution, the concept of weight was introduced, and the calculation formulas of hydrostatic pressure were derived in three cases that the outflow seam of bedding rock slope was blocked or un-blocked, or in a state between the blocked and the un-blocked. Considering the influences of hydrostatic pressure, hydrodynamic pressure, anchoring effect and seismic loading, the calculation formula of stability factor of typical bedding rock slopes was derived by using limit equilibrium method. A typical bedding rock slope was selected to carry out the case study. The results show that: the stability of bedding rock slopes decreases with the increase of total underground water level under the effect of waterpower; the stability of bedding rock slopes with blocked outflow seam is significantly less than the one with un-blocked outflow seam, and the stability of bedding rock slopes decreases with the increase of weight. References | Related Articles | Metrics

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Stability of High Fill Slope of an Airport in Southwest Mountainous Area HOU Junwei, TANG Qiuyuan, LI Yangqiu, MA Xinyan 2016, 35(3): 82-88.  DOI: 10.3969/j.issn.1674-0696.2016.03.18 Abstract ( )   PDF (2593KB) ( )   The stability of high fill slope which filled with sand-shale gravelly soil was studied based on a practical case of an airport high fill slope in southwest China. Rock and soil mass shear strength indexes were obtained through large direct shear strength tests in the field of the test section. At the same time, the deformation instability mechanism was simulated by strength reduction FEM. The result indicates that the silty clay layer is the weak interlayer of high fill slope foundation, and it will significantly reduce the stability of the high fill slope without treatment. Along with the fine grain material of sand-shale gravelly soil infiltration, the aquitard is formed with certain thickness between filling-up soil and stable basement, and the shear strength of this layer is obviously lower than the filling-up soil. The distribution of the aquitard on slippery surface can be changed by setting steps in basement excavation. The range of slope slippery surface through the aquitard decreases with the increase of steps height, and the slope stability coefficient increases. Possibility of slope global instability can be reduced by selecting appropriate slope shape. References | Related Articles | Metrics

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Formation Mechanism of Shashucao Landslide in Hubei Province YI Wu, HUANG Pengcheng 2016, 35(3): 89-93.  DOI: 10.3969/j.issn.1674-0696.2016.03.19 Abstract ( )   PDF (2517KB) ( )   There are plenty of landslides in Three Gorges reservoir area and Shashucao landslide is a typical bedding rock landslide. Through follow-up investigation after the landslide occurrence, the geographical location, the surrounding geology and basic geological characteristics of landslide were introduced. And the topography and geomorphy as well as geological characteristics before and after landslide were contrasted, which intuitively indicated the process of landslide occurrence, development and motion. Eventually, the influence factors and formation mechanism of Shashucao landslide in Hubei province were discussed. It is discovered that the vulnerable stratum structure and unfavorable geomorphologic shape are the internal causes of landslide occurrence, and rainfall is the key external factor to induce landslide. Shashucao landslide is a typical elapse precipitation type of bedding rock landslide. References | Related Articles | Metrics

Traffic & Transportation Engineering

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Vehicle Routing Problem Based on Hybrid Ant Colony Algorithm LIANG Chengji, CUI Jiacheng, DING Yi 2016, 35(3): 94-99.  DOI: 10.3969/j.issn.1674-0696.2016.03.20 Abstract ( )   PDF (1195KB) ( )   In order to solve the vehicle routing problem (VRP), a new ant colony algorithm based on C-W saving algorithm and local search algorithm was proposed. The hybrid algorithm solved the problem of the standard ant colony algorithm to search for a long time and easy to fall into the local optimal solution. Firstly, C-W saving algorithm was introduced to improve the quality of the initial solution, which made the ant algorithm search in a better way, so it could converge to the optimal solution more effectively. And then, the pheromone of path was controlled by using max-min ant system (MMAS), which avoided the local optimal solution of the algorithm. Finally, the sub-path of optimal solution for a certain stage was optimized by using local search algorithm. The proposed hybrid ant colony algorithm was used to calculate the examples in VRPLIB database, and achieved the satisfactory results. References | Related Articles | Metrics

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Model of Evacuation Route Choice in Emergency Traffic Based on Prospect Theory REN Qiliang, ZENG Ke, WANG Kun 2016, 35(3): 100-104.  DOI: 10.3969/j.issn.1674-0696.2016.03.21 Abstract ( )   PDF (1038KB) ( )   In order to better reflect the true response of evacuees’ decision in emergency evacuation, “bounded rationality” in prospect theory was used to describe the evacuation behavior of the person under uncertain risk. The emergency evacuation routing which had the maximum prospect value was determined by redefining the concept of “effective alternative path” and calculating the prospect values of various effective alternative paths. Through an example of emergency evacuation, it is indicated that the result of the above route choice is more in line with the route choice behavior in the real road network under the uncertain conditions of emergency traffic evacuation. The research result is of certain referential value for the decision makers under emergency circumstances to make scientific and effective evacuation decision. References | Related Articles | Metrics

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A Short-Term Traffic Flow Prediction Model Based on Spatio-Temporal Characteristics Analysis TIAN Baohui, GUO Bin 2016, 35(3): 105-109.  DOI: 10.3969/j.issn.1674-0696.2016.03.22 Abstract ( )   PDF (2342KB) ( )   The real-time and accuracy of traffic flow prediction directly affect the efficiency of traffic flow guidance system, which is a hot issue of intelligent transportation system research. In order to improve the accuracy of short-term traffic flow forecasting further, a short-term traffic flow prediction model based on spatio-temporal characteristics analysis was proposed. On the basis of spatio-temporal correlativity analysis of section, the parameters of support vector machine (SVM) were optimized by using the genetic algorithm improved by cloud model. At last, the optimal SVM model was obtained, and it realized the short-term traffic flow prediction. Based on the measured data of local road network in Changchun city, the feasibility and effectiveness of the proposed model were verified. References | Related Articles | Metrics

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Organization Optimization for Micro-circulation Transportation of Urban Traffic CHEN Qun, ZHAO Yu’nan, PAN Shuangli 2016, 35(3): 110-114.  DOI: 10.3969/j.issn.1674-0696.2016.03.23 Abstract ( )   PDF (1089KB) ( )   The impedance functions for left-turning and going-straight vehicle flows at each entrance lane of the branch road intersections of micro-circulation transportation were defined, which were related to the amount of left-turning and going-straight vehicle flows at the intersection of each entrance lane. With the objective to minimize the total travel time of vehicles, the bi-level programming model was established for micro-circulation traffic organization optimization, considering the capacity constraint of branch roads and route choices of drivers under a given traffic organization optimization scheme. The solution scheme using genetic algorithm was introduced. In a numerical example, the traffic flow organization optimization scheme was obtained, and the effectiveness of the proposed model and algorithm was verified. References | Related Articles | Metrics

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Classification Method of Urban Public Traffic Hub Station Based on Matter Element Analysis and Statistical Analysis ZHAN Guohui, QI Yan, TAN Xianlin, CAO Jia, ZHANG Yi 2016, 35(3): 115-120.  DOI: 10.3969/j.issn.1674-0696.2016.03.24 Abstract ( )   PDF (1994KB) ( )   On the base of analysis on the current classification methods of urban public traffic hub station, a classification method of urban public traffic hub station based on the theory of matter element analysis and statistical analysis was proposed. Firstly, according to the classification purposes and requirements, the evaluation index system of urban public traffic hub station was established with a set of alternative classification indexes. Secondly, the matter element analysis model of classification was formulated to determine the optimal classification indexes. Thirdly, through statistical analysis, the classification threshold was determined by using cumulative frequency method. Finally, the feasibility of the proposed system was discussed by the case study of the classification of public bus and trolleybus terminal. The result shows that the proposed classification method of urban public traffic hub station on basis of matter element analysis and statistical analysis is reasonable and practical. References | Related Articles | Metrics

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Evaluation on Public Transport Network Scheme Based on Set Pair and Entropy Analysis LIU Peng, WEN Huiying 2016, 35(3): 121-124.  DOI: 10.3969/j.issn.1674-0696.2016.03.25 Abstract ( )   PDF (1867KB) ( )   Due to the disadvantages that many current public transport network optimization evaluation methods were difficult to portray different types of uncertainty at the same time, the public transport network optimization scheme based on set pair and entropy analysis was proposed. The research system in the proposed method was divided into two local components, same and opposite, to describe the relationship degree with different types between two things. Comprehensively considering the above two local components, the accuracy of the system overall analysis was enhanced and the uncertainty was reduced; at the same time, the entropy theory was introduced to determine the objective weight of index, which reduced the uncertainty, such as the disturbance of subjective factors. The case analysis shows that the model can analyze the system of internal relations from the overall and partial aspect, and its computational process is simple and easy to use. References | Related Articles | Metrics

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Control Technique of Congested Traffic of Freeway Bottlenecks from the Perspective of Energy Conservation and Emission Reduction CUI Hongjun, LI Hainan, ZHANG Zhilei, ZHU Minqing 2016, 35(3): 125-128.  DOI: 10.3969/j.issn.1674-0696.2016.03.26 Abstract ( )   PDF (1082KB) ( )   For the questions of vehicles crowded and postponed, frequent start-stop and a sharp increase of fuel which often occurred at the bottlenecks of traffic capability sections, such as construction section and toll station on the freeway, an energy conservation and emission reduction control system of vehicles crowded and postponed was established, which was based on full investigation about the traffic flow characteristics and combined with traffic control technology and sensor detection technology. The case study indicates that the control system significantly reduces the number of vehicle start-stops and fuel consumption on the premise that the time of vehicle passing is not increased. References | Related Articles | Metrics

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Modeling on Choice Behavior of Short-Distance Intercity Travel Mode XIANG Hongyan, REN Xiaocong, CHEN Jian 2016, 35(3): 129-133.  DOI: 10.3969/j.issn.1674-0696.2016.03.27 Abstract ( )   PDF (1077KB) ( )   The residents’ intercity travels were divided into two phases: travel within city and travel between cities. Combined with transport network, the whole process of intercity travel was firstly analyzed, and then based on the theory of utility maximization, Nested Logit model for two phases of choice behavior of intercity travel was established: level 1 was for choice of travel within city mode; level 2 was choice of for travel between cities mode. Finally, the above model was calibrated and tested by TransCAD according to SP and RP survey data. It is concluded by analyzing the model calibration results that: the value of coefficient λ is 0.654, which indicates the influence of level 1 on level 2. And λ has passed the T-test, which shows the utility of travelling within city stage has a significant impact on travelers’ choice behavior of inter-city travel mode. Compared with ML model which doesn’t consider the travel within city, the superior degree ratio of NL model with the consideration of the travel within city has raised 0.07, which means NL model has higher accuracy. References | Related Articles | Metrics

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Pattern Recognition of Traffic Condition of Urban Rail Transit Pedestrian Passage CHEN Hong, WEI Lingxiang, LI Gaofeng, CAI Zhili, SHAO Haipeng 2016, 35(3): 134-140.  DOI: 10.3969/j.issn.1674-0696.2016.03.28 Abstract ( )   PDF (1249KB) ( )   A method based on support vector machine (SVM) was proposed, which used the pedestrian’s traffic flow parameters to realize the pattern recognition of traffic condition of urban rail transit pedestrian passage. Clustering analysis and definition of four kinds of pedestrian traffic status was realized by FCM algorithm, and multiple SVM traffic status identification model was established. Linear and nonlinear SVM classifiers were adopted respectively, and polynomial kernel function, radically Gaussian kernel function and sigmoid kernel function were also adopted in the pattern recognition of pedestrian passage traffic condition. Furthermore, the comparison analysis on the effectiveness was carried out through the actually collected data collection. The results indicate that the proposed algorithm has good recognition performance. With the comparison of overall recognition performance, RBF kernel function SVM model is the best one and its correct rate is over 85%, which indicates that the pedestrian traffic parameters are well linearly separable in the high-dimensional space of the kernel function conversion. Linear separability has relatively best performance in smooth state recognition, and the correct rate is 98%. Polynomial kernel function has relatively best performance in steady state recognition, and the correct rate is 93%. With the comparison of overall recognition performance, sigmoid kernel function is relatively most stable one, and the correct rate ranges from 85% to 92%. References | Related Articles | Metrics

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Model of Team Orienteering Problem with Two-Dimensional Loading Constraint and Its Optimization Algorithm PENG Yong, SONG Qiqin 2016, 35(3): 141-146.  DOI: 10.3969/j.issn.1674-0696.2016.03.29 Abstract ( )   PDF (2240KB) ( )   Taking the limited vehicle service resources, special goods loading requirements and other factors into account, a special logistic problem to maximize the profit — a team orienteering problem with two-dimensional loading constraint was studied. On the base of clear definition of the above problem, a corresponding mathematic model was established. Aiming at the model characteristics, a heuristic algorithm was designed, which took the genetic algorithm as a framework and made use of BLF algorithm to ensure two-dimensional loading constraint model. Numerical studies verify the effectiveness of the proposed algorithm. References | Related Articles | Metrics

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Contradistinction between Spoke Allocation Models in Hub-Spoke Network with Multistage Capacitated YANG Bin, YIN Yuqi, HU Zhihua 2016, 35(3): 147-154.  DOI: 10.3969/j.issn.1674-0696.2016.03.30 Abstract ( )   PDF (2137KB) ( )   In order to find the practical differences between single allocation and multi-allocation of spokes in hub-spoke network (HSN), the problem of the contradistinction between spokes’ allocation patterns in HSN under multi-stage capacitated was proposed, and the characteristics of two allocation patterns with uncertain demand were studied. Based on the basic model of HSN design, the mixed integer programming models of two kinds of distribution modes were established, which took the operating costs of HSN with multistage capacitated into consideration. According to the predicted demand scenes and their probability distribution, the optimal expected costs of the two network models were solved to design the hub and spoke network. Through setting three HSN design experiments, that is the optimal network design, the pre-specified number of hubs to locate and the changes in total demand, the network cost, the hub configuration and utilization rate of single allocation and multi-allocation models of spokes in the above experiments were contrasted. It is discovered that the multi-allocation network has the advantages of lower network cost, less number of hubs and higher utilization rate of the hub. References | Related Articles | Metrics

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Quay Crane Scheduling Optimization Considering Operation Balance at Container Terminal LE Meilong, XU Genlong, WEN Hongrui 2016, 35(3): 155-161.  DOI: 10.3969/j.issn.1674-0696.2016.03.31 Abstract ( )   PDF (1290KB) ( )   In order to improve the balance of resources allocation at container terminal, and then to improve the balance of the operators’ assigned tasks and the utilization rate of the quay crane resources, a quay crane allocation optimization problem, considering operation balance between quay cranes at container terminal, was proposed. A quay crane scheduling optimization model based on the quay crane operation balance at container terminal was established, in order to balance the quantities of the containers and the operational time of quay crane operation. And a genetic algorithm was designed to solve the model. By comparing the results of three different goals, it is concluded that considering the operation balance in the quay crane scheduling process is helpful to improve the utilization rate of quay crane and reduce the quay crane invalid operation time, so as to improve the whole operation capability of the container terminal. References | Related Articles | Metrics

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Collision Locations of Pedestrian-Vehicle Accident in Road Traffic Accident YANG Jianjun, DONG Dawei, HUANG Haibo, LI Pingfei, ZHANG Zhiyong, ZHANG Shibo, 2016, 35(3): 162-166.  DOI: 10.3969/j.issn.1674-0696.2016.03.32 Abstract ( )   PDF (1244KB) ( )   In the accident reconstruction and division of accident responsibilities of pedestrian-vehicle collision, the importance of identifying the collision location was described. The difference between the use of conventional method and PC-Crash analysis software was compared and analyzed, and it was proposed that using software for accident reconstruction should be combined with the traditional method to carry out the auxiliary verification. Based on this, two analysis methods were discussed by the case study of a pedestrian-vehicle collision. The results show that the above two methods have consistency in determining the speed and locations of collision. Through the combination of traditional method, the use of computer simulation can achieve the determination of pedestrian-vehicle collision location, which has a more intuitive visibility of accident reconstruction, and therefore it can be used for accident reconstruction and forensic needs of traffic accidents. References | Related Articles | Metrics

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Design of Public Bicycle Query System Based on Predictive Information CHEN Lingjuan, DAI Jiong, HU Sheng, WANG Dianhai 2016, 35(3): 167-172.  DOI: 10.3969/j.issn.1674-0696.2016.03.33 Abstract ( )   PDF (1732KB) ( )   In order to ease the difficulty of public bicycles’ borrowing and returning, a query system of public bicycles with WeChat interface was designed, which used WeChat platform to obtain data and used cloud platform to process data. Firstly, travel input was obtained by WeChat and the users’ travel demand for each period of time was fitted according to historical data. And then, according to the travel input, the information of around sites was extracted by the cloud platform, and the fitting data was used to predict the remained vehicles available to borrow when users arrived at the around sites; meanwhile, a sorting algorithm was provided to system users for site selection in order to guide users’ reasonable travel. Finally, taking a public bicycle network in Wuhan as an example, a query system of public bicycles was designed, whose functions included the site bicycle number query and route recommendation. And the improvement of forecasting information and traditional information on the problem was comprised. References | Related Articles | Metrics

Vehicle & Electromechanical Engineering

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Design of Intelligent Reconnaissance Vehicle Based on LabVIEW DENG Tao, LI Junying 2016, 35(3): 173-183.  DOI: 10.3969/j.issn.1674-0696.2016.03.34 Abstract ( )   PDF (2205KB) ( )   Based on LabVIEW software and taking Freescale K60 chip as the core, the hardware, software, circuits and host computer design of intelligent reconnaissance vehicle was carried out; furthermore, the real car was manufactured. The hardware design included the design of IP camera, DC motor, stepper motor, wireless video acquisition card, wireless module, steering gear, ultrasonic module, searchlight, MQ-2 combustible gas sensor and so on. The software design included the design of overall control program and complier program. The circuits design contained Freescale K60 chip circuit, ASM1117 regulating circuit, the DC motor BTS7960 driving circuit, ultrasonic transmitting/receiving circuit and the whole circuit board design. The host computer program design adopted the virtual instrument, used LabVIEW to program, and developed the control and information display panels, ultrasonic ranging and combustible gas detection panels of the intelligent reconnaissance vehicle. References | Related Articles | Metrics

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Strengthening Mechanism and Compound Strengthening Model of Carbon Fiber and Engineering Vehicle Retreaded Tire WANG Qiang, QI Xiaojie, WANG Yunlong, WANG Guotian 2016, 35(3): 178-182.  DOI: 10.3969/j.issn.1674-0696.2016.03.35 Abstract ( )   PDF (1443KB) ( )   In order to improve the quality of the retreaded tires of engineering vehicle, mixing physical model and distributed physical model of carbon fiber and tread rubber compound enhancement were established, which took the carbon fiber as the reinforcement and the engineering retreaded tire tread as the basic body. Through the design of formulation, adhesive system and mixing technology of composite material, the effect of modified carbon fiber on the basic mechanical properties of tread rubber was analyzed. And the bonding state and bonding mechanism of carbon fiber and tread rubber were analyzed, which provided a theoretical foundation to obtain the carbon fiber reinforced engineering retreaded tire with high performance. References | Related Articles | Metrics