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15 December 2014, Volume 33 Issue 6 Previous Issue    Next Issue

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Full Aeroelastic Model Design of Long-Span Suspension Bridge with Streamlined Steel Box Girder Zhou Jian, Xiong Long, Wang Qi, Meng Lingliang, Li Yuanbo 2014, 33(6): 1-4.  DOI: 10.3969/j.issn.1674-0696.2014.06.01 Abstract ( )   PDF (1190KB) ( )   The design，fabrication，installation and debugging of full aeroelastic model of Maputo bridge(main span 680 m were elaborated. Firstly, the required similarities and consistency conditions of design for the full aeroelastic model were introduced. Then, the design and manufacture technique of structural components such as girder，main cables，sling，pylons were expounded. In the end, the model debugging approach and testing results of the model under completion state and four typical construction states were presented. The results of testing dynamic characteristics show that the design and manufacture method are feasible for the full aeroelastic model of Maputo bridge. The model is satisfied for the experimental requirements, and the research can provide reference for wind resistance studies of other similar bridges. References | Related Articles | Metrics

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Simplified Calculation Method of Unstressed Length of Cable-Stayed Bridge with Separate Twin-Decks Zhao Lei, Jia Shaomin, Gu Xiang 2014, 33(6): 5-8.  DOI: 10.3969/j.issn.1674-0696.2014.06.02 Abstract ( )   PDF (842KB) ( )   Steel cable-stayed bridge with multi-tower, separate twin-decks and asymmetrical cable plane is a typical spatial structure. The number of cable is large, so it’s difficult to determine unstressed length of each cable directly. Taken Jiashao Bridge with six-towers, double decks and four space cable planes as the research subject, firstly based on the principle of equivalent stiffness, the main bridge structure was simplified as a planar structure, to determine its reasonable equivalent cable force; secondly a principle of distribution cable force was put forward, and the flat equivalent cable force was transformed into space cable force; finally unstessed length of each cable was calculated based on catenary equation. The method can quickly and accurately determine unstressed length of each cable. References | Related Articles | Metrics

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Simulation on Balanced Reinforced Concrete Beam Without Preset Crack Zhu Guangfu, Xu Bing 2014, 33(6): 9-12.  DOI: 10.3969/j.issn.1674-0696.2014.06.03 Abstract ( )   PDF (1102KB) ( )   A crack-free reinforced concrete beam under four-point bending was designed. The simulation calculation was carried out by both nonlinear and XFEM method, which were proved to be effective. Firstly, the stress-displacement relation of nonlinear results conformed with the material constitutive relation. Secondly, the calculation of XFEM was closer to reality. It was simulated for no preset cracks in reinforced concrete beam. Both the number and the location were random when cracks appeared under criterion of fracture mechanics, and the growth of cracks conformed to the truth. All the tensile and compressive rebar reached the material limit, which met the designing requirement of the balanced-reinforced concrete beam. References | Related Articles | Metrics

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Fatigue Analysis of Single Cracked RC Beam Strengthened with FRP Liu Feng, Chen Deliang 2014, 33(6): 13-17.  DOI: 10.3969/j.issn.1674-0696.2014.06.04 Abstract ( )   PDF (838KB) ( )   The crack influence factor was introduced to describe the stress concentration phenomenon near the crack. The displacement response of reinforced beam under simple harmonic load was calculated by using the Hamilton energy principle. The stress intensity factor and the fatigue life of crack propagation were obtained by using displacement response of the reinforced beam combined with Paris formula.The results of theoretical calculation were contrasted with the results of finite element analysis. The results show that the crack stress intensity factor and fatigue crack propagation life are sensitive to load, and the results of theoretical method have good agreement with the results of finite element simulation. References | Related Articles | Metrics

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Optimum Design of Load Test Vehicle Layout Based on Complex Method Wang Xiaosong,Yang Meiyun, Chen Bin 2014, 33(6): 18-21.  DOI: 10.3969/j.issn.1674-0696.2014.06.05 Abstract ( )   PDF (701KB) ( )   The determination of the vehicle location layout process for bridge static test was seen as a constrained optimization problem of vehicle location, vehicle direction, vehicle type, occupying lane number as design variables. The efficiency of non-load-sectional is not excessive which was taken as the constraint conditions. The efficiency of loading section and total number of vehicles was taken as the objective function. The discrete variables were dealt with continuous processing by rounding method. The complex method was used for the optimization calculations. It is demonstrated that the method is suitable for bridge static test in the determination of vehicle position and the efficiency of non-load-sectional is not excessive. References | Related Articles | Metrics

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Study on Shear Behavior of Glued Joint Structure in Segmental Precast Concrete Beam Yuan Aimin, He Yu, Cheng Leike, Qian Shoulong 2014, 33(6): 22-26.  DOI: 10.3969/j.issn.1674-0696.2014.06.06 Abstract ( )   PDF (1225KB) ( )   The joint is a key structure as well as the weak link of the precast segmental construction bridge. In order to do research on shear behavior of glued joint structure in segmental precast concrete beam under the direct shear, experimental research on shear behavior of glued joint structure was conducted which took depth and space of shear key as the influences factors.The analysis of the influence to the shear capacity caused by the two factors was based on the comparation of vertical displacement and failure load. The results show that vertical deformation of each test specimen could be divided into linear deformation and interface slippage, and their deformation curves are similar. Shear capacity has direct ratio relation with the area of shear breakage, and has no correlation with depth and space of shear key. The specimen reaches its failure load soon after the appearance of the cracks, and there is no obvious and stable yield stage, so it belongs to brittle failure. References | Related Articles | Metrics

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Temperature Effect Analysis of Steel-Box Concrete Composite Arched Bridge in Construction Process Han Hui, Lv Na, Zhou Zhixiang, Zhang Jin 2014, 33(6): 27-33.  DOI: 10.3969/j.issn.1674-0696.2014.06.07 Abstract ( )   PDF (1630KB) ( )   In the construction process, the stress and deformation effects of steel-box concrete composite arched bridge under the overall temperature change and sunlight temperature change cannot be neglected. Taken the Sunxi River bridge in Jiangjin as a study object, construction steel box stress, structural deformation and temperature distribution under the overall temperature change and sunlight temperature change were in-depth studied. The results show that the overall effect of temperature change under stress and deformation increases with temperature. At the empty steel box stage the most unfavorable position locates at the foot arch, and the maximum stress increments up to 40 MPa. At the main arch forming stage the most unfavorable position is at the main arch 3/8L, and the maximum stress increments up to 25 MPa. Under the influence of sunshine, due to internal heat conduction concrete, the temperature and stress of steel-box and concrete relatively uniform; the steel tank temperature substantially equals on both sides; the top and bottom edge of the steel box have a certain temperature difference. References | Related Articles | Metrics

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Optimization of Urban Interchange Bridge Construction Method Based on AHP-FIE Huang Haidong，Liu Tao 2014, 33(6): 34-39.  DOI: 10.3969/j.issn.1674-0696.2014.06.08 Abstract ( )   PDF (1012KB) ( )   Taking the complicated condition of urban interchange-Chongqing Huangjuewan as a research project, the comprehensive evaluation system of AHP-FIE was applied to the construction method of optimal selection in the bridge superstructure. An index set model of five aspects which includes economy, risk, technology, application and the limited time was established to make the combination of quantitative and qualitative analysis. The Bailey beam door support was proved to be the best, and the most optimal scheme in the Huangjuewan interchange construction. The evaluation value is 0.396. References | Related Articles | Metrics

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Research on Measures of Reducing Crossflow Between Road Tunnel Portals Xu Pai, Jiang Shuping, Xing Rongjun, Chen Jianzhong 2014, 33(6): 40-44.  DOI: 10.3969/j.issn.1674-0696.2014.06.09 Abstract ( )   PDF (922KB) ( )   The phenomenon of crossflow and its nature were analyzed in detail, and the engineering measures for solving the problem of crossflow were proposed. Meanwhile, the effective degree was quantitatively analyzed and the concept of crossflow measures efficiency was put forward. The measures about setting ventilation horizontal hole or skylight were set into four categories: fresh air supply in upstream tunnel, polluting gases exhaust in upstream tunnel, fresh air supply in downstream tunnel, polluting gases exhaust in downstream tunnel. The correctness of the quantitative analysis was verified by an instance of simulation using fluent software. The conclusion shows that the effective degree of fresh air supply in downstream tunnel is much better than that of the other three. References | Related Articles | Metrics

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Research on Precast Block Pavement Structure Design of Flexible Base Wang Huoming, Ling Tianqing, Zhou Gang, Wang Xiu, Li Rukai 2014, 33(6): 45-49.  DOI: 10.3969/j.issn.1674-0696.2014.06.10 Abstract ( )   PDF (701KB) ( )   Because of having a lot of discontinuous seams, the force and deformation of precast block pavement are quite different from conventional cement pavement and asphalt pavement. Based on indoor loading plate test and circular track test results, it can be concluded that the structure design indicator of precast block pavement is rut depth. The axle load conversion method was established on the principle of the same rut depth. And the allowing rut depth range of precast block pavement was put forward. Furthermore, a structural design methodology about flexible base of precast block pavement which based on mechanics was established. References | Related Articles | Metrics

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Research on Abrasion Resistance of Manufactured Sand-Recycled Concrete Liu Tangzhi, Rui Jie, Wang Bing, Liu Yifeng 2014, 33(6): 50-53.  DOI: 10.3969/j.issn.1674-0696.2014.06.11 Abstract ( )   PDF (613KB) ( )   Low abrasion resistance of recycled coarse aggregate concrete is one of the main reasons which limit its application in pavement. The abrasion resistance of manufactured sand concrete is better than natural sand concrete. In order to study the abrasion resistance and factors of manufactured sand recycled concrete, different proportions were designed to test abrasion resistance. The results show that, with the increase of recycled aggregate replacement rate the concrete weight loss increases; the abrasion resistance of manufactured sand recycled concrete is better than natural sand recycled concrete; the stone powder of the manufactured sand can improve the abrasion resistance, and in a certain range, the abrasion resistance of concrete decreases with the increase of stone powder. References | Related Articles | Metrics

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Influence of Polymer Composite Additive Morphological Parameters on the Mixing Process and the Technical Performance of Asphalt Mixture Yang Qian, Hao Peiwen 2014, 33(6): 54-58.  DOI: 10.3969/j.issn.1674-0696.2014.06.12 Abstract ( )   PDF (800KB) ( )   Through the specific use of the environment of the polymer composite additive in asphalt mixes dry process and IPP image processing software, the area change exonuclease ellipse than the maximum radius, minimum radius, radius changes than five indicators were selected to analyze the three composite additive thermal aggregate before and after the different morphological changes. Through comparative analysis of the time at 120 ~ 180 ℃ and mixing 180 s, matrix asphalt, SBS modified asphalt materials and add A, B, C three different polymer composite additives asphalt mixture workability, the polymerization correlation between substance and compound additives melt index of deformation parameters and technical performance of asphalt mixture were established . Studies have shown that: melt index of the polymer composite additives have an important impact on the deformation parameter, and road asphalt modification effect is closely related with the performance. References | Related Articles | Metrics

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Broken Stone Gradation Research Under Maximum Shear Strength Xing Xinkui,Teng Detao, Zhang Jiawen, Liu Jing, Sun Guanxiao 2014, 33(6): 59-62.  DOI: 10.3969/j.issn.1674-0696.2014.06.13 Abstract ( )   PDF (758KB) ( )   By the graded broken stone gradation theory, the gradation design method was proposed based on the greatest shearing strength. The self-made large direct shear apparatus was applied to carry out the shearing strength experiment to the design gradation. The relations of the shearing strength, the crushed stone allocated proportion and compactness were analyzed, and compared with standard design grading. The test results show that the designed gradation can improve aggregate's performance. The graded broken stone scope of present standard could be supplemented in order to design and control construction conveniently, and to enhance the graded broken stone operational performance. References | Related Articles | Metrics

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omparative Experiment on Vibrating Compaction and Modified Proctor Compaction of Silt Cement-Stabilized Gravel Aggregate Hong Liang，Liu Tao，Yang Sanqiang 2014, 33(6): 63-67.  DOI: 10.3969/j.issn.1674-0696.2014.06.14 Abstract ( )   PDF (755KB) ( )   In order to contrast vibrating compaction method (VCM and the relationship between the modified proctor compaction method(MPCM, three types of graded gravel aggregate and two kinds of cement dosage performance were compared. The results show that the optimum moisture content of VCM is reduced by 10%~20% than that of MPCM, and the maximum dry density is 1.01~1.02 times.The damage of MPCM to gravel gradation is larger than that of VCM. In the same cement dosage of case, the unconfined compressive strength of vibrating compaction sample 7 days is better than the isostatic pressing one. References | Related Articles | Metrics

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Job-Mix Formula Gradation Matrix Model and Parameter Study on Asphalt Batching Plant with Vibrating Screens Liu Ke 2014, 33(6): 68-78.  DOI: 10.3969/j.issn.1674-0696.2014.06.15 Abstract ( )   PDF (1495KB) ( )   he gradation of asphalt mixture is variable and its dynamic analysis should be based on mechanism model. Aggregate is synthesized，winnowing separated， sieved and synthesized in asphalt plant. Gradation of twice separation products has not been calculated for complexity of mechanism. The gradation was represented by pass rate vector. The dust gradation and quantity study was carried out in asphalt plants，which was used to calculate the hot material gradation in elevator. Hot aggregate gradation was modeling based on two hypothesis of vibrating screens, and its model parameter was studied and selected based on hot aggregate gradation statistics. The results show that ratio of dust and raw material is 7.6%~13.5%，which is independent of dust gradation. Screening efficiency of upper screens is higher than lower screens. The larger the aggregate size is, the lower the screening efficiency and is; the smaller the particle size is ,the much the dust is.The construction gradation obtained by matrix model has little difference with two existing methods. Matrix model is suitable for gradation analysis based on varied parameter. References | Related Articles | Metrics

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Automatic Routing Method Based on AIS Tracks and Douglas-Peucker Zhang Shukai, Yang Jiaxuan, Cai Yao, Shi Guoyou 2014, 33(6): 79-82.  DOI: 10.3969/j.issn.1674-0696.2014.06.16 Abstract ( )   PDF (1279KB) ( )   An automatic creating algorithm of route based on AIS historical data after cleaning was put forward. The route was created by using Douglas-Peucker algorithm to compress track data according to a specific user-defined threshold and extract critical turning point. The route was generated by compressing real track point so it can shorten the distance and improve the economic benefit. The route was detected by using the abundant information of electronic chart and the route was adjusted when some parts of route were close to obstacles to make sure that there were no obstacles on the planned route. Study results show that the route generated by the algorithm is safe and economical because of keeping away from dangerous obstacles. It can be an important reference for the mariners. References | Related Articles | Metrics

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Experimental Study on Approach Channel Layout of Navigation and Hydropower Project Shi Xufang, Zhang Jianmin, Hu Xiaoyu, Yu Fei, Li Shuai 2014, 33(6): 83-88.  DOI: 10.3969/j.issn.1674-0696.2014.06.17 Abstract ( )   PDF (3676KB) ( )   Model experiments of hierarchical permeable structure of upstream approach channel and different length of downstream approach channel of a large navigation and hydropower project in “S” shaped river were conducted. The influence of the layout position and structure of upstream and downstream partition wall on navigable flow conditions was analyzed. The results show the reflux flow rate can be improved by the application of the hierarchical permeable structure of upstream approach channel, but the permeable flow discharge need to be controlled, in case that excessive permeable flow causes unfavorable lateral flow rate at parked segments. The reasonable position and angle are more effective than simply increasing the length to improve navigable flow condition of downstream approach channel. References | Related Articles | Metrics

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Influence of Sand-Gravel Extraction on Degan Dam Reach in the Yangtze River Shen Ling, Ling Xiao, Chen Yan 2014, 33(6): 89-92.  DOI: 10.3969/j.issn.1674-0696.2014.06.18 Abstract ( )   PDF (925KB) ( )   Through the generalized model experiment of sand-gravel extraction of Degan dam in the Yangtze river, the erosion process of each level of flow was simulated, and the influence of sand mining on Degan dam river was also analyzed. The test results indicate that the navigation ability variation of the river bed, the regime and the channel caused by mining in the mountainous river is lesser, and the sand mining pit is also difficult to cause the traceability of the scour. The river course engineering is of almost no effect, so it is suitable for the establishment of sand mining point to extract sand. But the mining pit backfill quantity is far less than its yield, so the mining amount and mode should be scientifically planned, which will guide the regime to develop in the stable direction. References | Related Articles | Metrics

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Research on Xiangjiang Shiplock Capacity Shu Xiaohong 2014, 33(6): 93-95.  DOI: 10.3969/j.issn.1674-0696.2014.06.19 Abstract ( )   PDF (619KB) ( )   By the analysis of the Xiangjiang shiplock capacity status and the research of lock capacity effect factors, the bottlenecks which limited of the shiplock capacity was found out, and the maximum lock passing capacity was fully dug. Thus a feasible method for improving the Xiangjiang River lock capacity and to solve the lag of navigation was available. References | Related Articles | Metrics

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Study of Centrifuge Model Test on Embankment Filled with Sand Tube Bag Qiao Xiaoli, Zuo Dianjun, Zhang Yuting, Ma Xilei 2014, 33(6): 96-99.  DOI: 10.3969/j.issn.1674-0696.2014.06.20 Abstract ( )   PDF (2018KB) ( )   Centrifuge modeling test was adopted to study the seawall engineering stability basing on the sea wall moving outwards practical engineering in Hangu district, Tianjin city. The modeling technology, modeling method and the operate method were presented in detail in the centrifuge modeling test which can provide a certain reference. Test results show that under the condition of 2 m scour depth, the toe and gear shift of thesea dike construction is small. One year later the vertical displacement were 58 mm and 28 mm seperately. The results show that the influence of display scour depth of the sea outside on the safety and stability is little. References | Related Articles | Metrics

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Stability Study of Multi-Step Slope Based on Strength Reduction Method Chen Yinchun, Hu Wenliang 2014, 33(6): 100-103.  DOI: 10.3969/j.issn.1674-0696.2014.06.21 Abstract ( )   PDF (1263KB) ( )   The step number, ratio and platform width which influenced the stability of multi-step slope were analyzed by using the strength reduction finite element method. The effect laws of each factor on slope stability were concluded; and the maximum shear strain region of slopes was analyzed when the critical slope was unstable. The results show the essential impact of each factor on slopes stability was changing the shear zone of slopes to change the sliding resistance force. References | Related Articles | Metrics

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Research on Object-Oriented Land Cover Information Extraction Mu Fengyun,Luo Dan,Guan Dongjie,Wu Xiaochun 2014, 33(6): 104-108.  DOI: 10.3969/j.issn.1674-0696.2014.06.22 Abstract ( )   PDF (1932KB) ( )   Taken Landsat-5 TM image in Shenyang city, Liaoning province as a data source, ERDAS software was used for supervised classification and eCognition software for object-oriented classification. Multi-scale segmentation method in object-oriented classification and the nearest neighbor classification were selected to classify. After classification, the error matrix of supervised classification was calculated to obtain overall accuracy, kappa coefficient, producer accuracy and user accuracy. The best classification result and classification stability method were selected to assess accuracy in eCognition software. The results were (supervised classification/object-oriented classification): settlement 91.14%/93.50%, farmland 86.91%/93.80%, forest 91.73%/ 96.70%, grassland 84.44%/91.36%,water 98.16%/96.18%. The result of object-oriented classification method improves the efficiency and accuracy of classification compared to traditional supervised classification method. References | Related Articles | Metrics

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Lowry Model Dynamic Improvement Based on City Regional Development Wang Lisheng, Shuai Bin 2014, 33(6): 109-113.  DOI: 10.3969/j.issn.1674-0696.2014.06.23 Abstract ( )   PDF (760KB) ( )   To use Lowry Model to study the dynamic distribution of population and employment in the urbanization progress, the basic assumptions and some insufficient of Lowry Model and other improved models were analyzed, then the curve of population was appplied to simulate the evolution of basic-industry. On base of that, a new improved model was proposed to combine with constraints such as population and land-use. It obtained a dynamic increasing matrix to reflect the different developing speed in different areas among a city. Finally, an example was given to test this model, the result shows that its boundary value converges to constraints above. References | Related Articles | Metrics

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Research on GPS Route Decisions with Adaptive Cost Function Li Zhonghua, Yang Jin, Ni Mingtao，Wang Hui 2014, 33(6): 114-117.  DOI: 10.3969/j.issn.1674-0696.2014.06.24 Abstract ( )   PDF (589KB) ( )   The most important function of Car GPS (Global Position System) system is traffic analysis and path selection. In view of the complexities of the city transport networks, the approach of deciding the best path was proposed based on traffic conditions and user needs. Taking the traffic information as road network value, and the user needs as minimum cost function, to determine the best path algorithm of GPS combined with the complex network theory and DIJKSTRA algorithm, and realize the best path strategy of GPS with adaptive cost function. Simulation results demonstrate the effectiveness of the method. References | Related Articles | Metrics

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Transportation Demand Management Strategies of Suburban Commuting Shen Yingjie, Han Baorui, Ma Jianxiao 2014, 33(6): 118-121.  DOI: 10.3969/j.issn.1674-0696.2014.06.25 Abstract ( )   PDF (961KB) ( )   The spatial relationship of jobs and housing is evolving over time along with the city spreading to the suburban areas; and then the long-distance commuting from the suburb to the city central intensifies the problems of urban transportation. Through the qualitative analysis of suburban commuting traffic characteristics and problems in Nanjing Suburb: Dong-Shan and Mo-Ling, the adapted comprehensive transportation demand management(TDM)from land use, diverse modes of transportation and vehicle management was put forward, in order to optimize the traffic structure and improve the quality of commuting travel. Meanwhile, it provides a reference for the further implementation of transportation demand management. References | Related Articles | Metrics

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Determination of Freeway Weight Toll Rate Based on Network Characteristics Wei Lianyu，Li Zhuang 2014, 33(6): 122-126.  DOI: 10.3969/j.issn.1674-0696.2014.06.26 Abstract ( )   PDF (849KB) ( )   Based on the analysis of the regional network system characteristics, and the comprehensive consideration of government’s policy, road structure, goals of freeway exploitation corporations and overloaded truck operators, a game model that the upper maximum the total charges, the lower minimum of overall generalized cost was established with the idea “maximum the comprehensive benefits of the regional network, charging by model and overload phase”. Genetic algorithm was adopted in the concrete optimization course for solution.Through an example of calculation the correctness and feasibility of the model to determine the toll rate were verified, and the improvement suggestions for implementation of weight toll were put forward. References | Related Articles | Metrics

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Study on Vehicle Routing Choice Under Congestion Pricing Based on Variable-Weight Analytical Hierarchy Process Hu Yiwei, Li Zhenggang, Hu Wanxin, LiuYan 2014, 33(6): 127-130.  DOI: 10.3969/j.issn.1674-0696.2014.06.27 Abstract ( )   PDF (801KB) ( )   Traveler route choice decisions were analyzed by using variable-weight analytical hierarchy process, and the overall structure of the index system was divided into four levels, target A, criteria C, criteria D and measures P. The logit model was selected as the incentives (penalties) variable weights of the standard layer. And taking into account the influence of cost, travel time, travel distance and route infrastructure conditions on the target evaluation value, the price charged was adjusted until each path combination weight equals to the ratio of its capacity. Then, travelers can select the path according to the priority vectors. Finally, an example was given to illustrate how the government formulates a charging strategy to improve network utilization and guide people to make reasonable choices. References | Related Articles | Metrics

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Optimization of Empty Liner Containers Allocation Considering In-Transit Inventory Cost Yang Hualong, Zhang Xindi, Wang Ruijuan, Zhang Yan 2014, 33(6): 131-135.  DOI: 10.3969/j.issn.1674-0696.2014.06.28 Abstract ( )   PDF (736KB) ( )   In view of the allocation optimization problem of empty containers in short-sea service for liner carriers, the composition of total empty container allocation cost in liner service was analyzed. The idea of global optimization of empty container allocation with rolling multi-voyage was pointed out based on the features of cycle multi-port call route in short sea liner service, as well as the characteristics of its unbalanced container cargo direction and demand. The rolling multi-voyage empty containers allocation optimization model of multi-port call in short sea liner service was established with the objective of minimizing the total cost of empty containers allocation on the premise that both the customers’ requirements of empty containers and loaded containers were satisfied. The results of an empirical study verify the feasibility and efficiency of this model. References | Related Articles | Metrics

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Research on Diverting and Guiding Traffic Flows Layer-by-Layer in Urban Road Construction Affected Zones Liu Wei, Wang Liliang, Lin Ying, Ouyang Lei 2014, 33(6): 136-141.  DOI: 10.3969/j.issn.1674-0696.2014.06.29 Abstract ( )   PDF (895KB) ( )   According to OD traffic volume of the peripheral node of the construction area, with the method of distribution of capacity constraint, we can calculate the surrounding traffic volume after the occupation. Referring to the threshold values of traffic impact degree classification, we can determine the degree and scope of surrounding roads by presence construction. In the construction-influencing zone, based on the status quo of traffic and road conditions, with constrain on the reliabilities of the path travel time, we can calculate the minimum dredging traffic and surplus bearing capacity of road. We can expand the scope of guidance from the construction section step by step until meeting the constraints of travel time reliability. At last the traffic flow of the construction roads can be controlled in the acceptable range. This can reduce influence on the presence construction to traffic. References | Related Articles | Metrics

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Gray Relation Analysis of Time Domain Index and Driving Fatigue of Prairie Highway Drivers Qin Wei，Zhu Shoulin，Pei Zhiyong，Qin Yan 2014, 33(6): 142-145.  DOI: 10.3969/j.issn.1674-0696.2014.06.30 Abstract ( )   PDF (585KB) ( )   The characteristics of grassland highway are long straight line, slight grade, and monotonous landscape. Drivers are liable to become tired when they travel on this kind of road. Drivers’ heart rate variability(HRV) data were collected when they travelled along grassland highway at free speed in the field. And after quantificationally analyzing these data, it is concluded that drivers always begin to become tired after they continuously drive 120 minutes. Using gray scale analysis theory, the relationship between time domain indicators of drivers and driving fatigue were studied, and the degree of correlation of them was found. References | Related Articles | Metrics

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Multi-Degree Vibration Damping Performance Analysis of Suspension Spring of Bridge-Detection Vehicle Li Qingtong , Xu Yangjiao , Li Jun , Zhou Zhixiang 2014, 33(6): 146-149.  DOI: 10.3969/j.issn.1674-0696.2014.06.31 Abstract ( )   PDF (537KB) ( )   According to the characteristics of nonlinear suspension system, the working principle and stiffness characteristics of 3-degree rigidity spiral spring vibration attenuation system were analyzed. Taking one certain bridge-detection vehicle as research object, the matching design of 3-degree rigidity spiral spring vibration attenuation system was done, and the elastic characteristic, frequency of vibration and damping characteristic of the vibration attenuation system were analyzed. The results show that multi-degree vibration attenuation system has a more ideal elastic stiffness characteristic curve comparing with single stiffness system, and it can meet the demands of multiple load case. Multi-degree vibration attenuation system can reduce vibration of the vehicle, and improve automobile’s smoothness and comfort. References | Related Articles | Metrics

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Study on Effective Volume Utilization Rate of Air Spring Auxiliary Chamber Zhang Weilong, Chen Liao 2014, 33(6): 150-154.  DOI: 10.3969/j.issn.1674-0696.2014.06.32 Abstract ( )   PDF (1182KB) ( )   To research on stiffness characteristics of air spring with adjustable auxiliary chamber, test system was built, and corresponding mathematical model was established. Test and simulation were carried out, and the results show that: the increase of vibration frequency and amplitude could increase spring dynamic stiffness, however, auxiliary chamber volume increase could reduce the dynamic stiffness. But when auxiliary chamber volume reaches about the same volume of main chamber, its further volume increase has little influence on dynamic stiffness. Expression of auxiliary chamber effective utilization rate was deduced, and different influence factors were researched. The increase of vibration frequency and amplitude can reduce volume effective utilization rate of auxiliary chamber while the initial pressure has no effect on it. The experimental and simulation results are consisstent. References | Related Articles | Metrics

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Development of Evaluation and Test System for Regenerative Braking Huang Xuan, Zhang Shupei, Wang Guolin, He Changyuan 2014, 33(6): 155-160.  DOI: 10.3969/j.issn.1674-0696.2014.06.33 Abstract ( )   PDF (1231KB) ( )   In order to assess regenerative braking system of the electric vehicle and hybrid electric vehicle, a set of evaluation and test system for regenerative braking was developed. It includes evaluation index and detection system. Regenerative braking system can be evaluated comprehensively by the evaluation index, and detection system was a set of thorough detection platform which includes hardware part and software part. Through real vehicle detection test of regenerative braking, the reliability and effectiveness of the evaluation and test system were verified. References | Related Articles | Metrics

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Out Value Algorithm of Tractor Semitrailer Combinations Duan Bin, Shan Yingchun, Liu Xiandong, Zhang Hongwei, Dong Jinsong 2014, 33(6): 161-166.  DOI: 10.3969/j.issn.1674-0696.2014.06.34 Abstract ( )   PDF (1123KB) ( )   According to the definition, limits and test methods of out value in GB 1589—1589 and GB/T 12540—2009, the numerical computation method about out value of the tractor semi-trailer combinations was studied. This algorithm referenced the mapping method of a tractor semi-trailer combination’s turning process within turning clearance circle. Firstly, the quantitative analysis method of turning process based on the inertial coordinate system and joint coordinate system was studied. An algorithm about out value of the tractor semi-trailer combinations was deduced and the out value of a specific tractor semi-trailer combinations was calculated. In addition, the effects of some geometrical parameters of tractor and semi-trailer were analyzed. At last, the correctness of the algorithm was verified by using the TruckSim simulation and real tests. The results prove that the algorithm is concise, effective and intuitive and provides theoretical guidance for the design and matching of this kind of vehicle. References | Related Articles | Metrics

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Used Car Evaluation Method Based on DHGF Model Xu Lei, Peng Jinshuan, Shao Yiming 2014, 33(6): 167-170.  DOI: 10.3969/j.issn.1674-0696.2014.06.35 Abstract ( )   PDF (617KB) ( )   In order to explore the scientific and effective evaluation methods of the used cars, the evaluation index system of used vehicles was constructed from the view of service life, power performance, fuel economy, braking performance and so on. DHGF model was established based on the theory of Delphi, analytic hierarchy process, gray prediction and fuzzy evaluation, then these methods were tried to be applied in the evaluation process of the used vehicles. The evaluated value was close to its market price. Results show that DHGF model draws the advantages of its sub methods and avoids the inherent defects at the same time, which could be widely applied in the used vehicles’ evaluation, so as to ensure the scientific nature and reliability of the evaluation process. References | Related Articles | Metrics