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15 August 2010, Volume 29 Issue 4 Previous Issue    Next Issue

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Impact of Auxiliary Pier's Position on Structure of Partially Cable-Supported Girder Bridge CHENG Yupeng, WANG Fumin, SHANG Junnian 2010, 29(4): 497-500.  Abstract ( )   PDF (319KB) ( )   A three-dimensional finite element calculation model was established for the main bridge of the Dongshuimen Yangtze River Bridge in Chongqing by using software MIDAS Civil. It was obtained that different positions of the auxiliary pier exerted influence on the main tower, the bottom chord on the bracket, thema in girder in the bridge completion state of the new partially cable-supported girder bridge. The calculation results demonstrated that increase of auxiliary piers would lead to bend ingmoment of the lower main tower, vertical displacement of upper tower, smaller axial stress and deflection of themain girder central span and greater bending moment of bottom chord on the bracket References | Related Articles | Metrics

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Calculation Model and Dynamic Response of Continuous Rigid Frame Bridge in Collision with Ship LUO Qi-zhi, HE Yun-yong, XU Zhong-shan 2010, 29(4): 501-505.  Abstract ( )   PDF (369KB) ( )   Based on collision theory and boundary principle, the calculation model of collision between bridge piers, with continuous rigid frame bridge as a case and ships was studied. According to Timoshenko shearing strain theory and Hamilton energy variation principle as well as the bending, shearing and impact of superstructure deflection of bridges, transient vibration equation of bridge piers was deduced. Based on integral transform method, differen tial equation of the collision system and transform ation of boundary conditions with Laplace, the wave so lution in frequency domain was acquired. With Crump inverting transform ation and Matlab programming, the impact forces and various dynamic responses in time domain was obtained. References | Related Articles | Metrics

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Research on Buffer Effect and Energy Absorption Capacity of Buffers under Impact Loading XU Qi, ZHANG Nan 2010, 29(4): 506-509.  Abstract ( )   PDF (327KB) ( )   Installing buffer on pier surface could be employed to increase the anti-vehicle-crash capacity of viaduct bridge and overpass bridge. The buffer effect and energy absorption capacity were ana lyzed based on lateral impact test of reinforced concrete pier specimen. The influence of buffer on dynamic performance of pier was also analyzed. The test results have proven that impact force and dynamic performance of pier can be greatly reduced by installing buffers for proper design can lead to favorable buffe reffect and energy absorption capatity. In this way, impact load can be decreased by 49%, the peak strain of tensile bar in the middle section, 63%, and the peak displacement in the middle section, 75. 6% . References | Related Articles | Metrics

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Numerical Simulation and Analysis of Flood Assessment of the Qingbaijiang Railway Bridge JIN Rui, ZHANG Xu-jin, PENG Yong-qin 2010, 29(4): 510-513.  Abstract ( )   PDF (265KB) ( )   Two-dimensiona lmathem atical model of water flow was used to conduct feasibility study on the Qingbaijiang railway bridge. By comparing water condition changes before and after the bridge construction, the scouring im pact of velocity around bridge piers and change of water surface line on piers was investigated. The feasibility of railway bridge provided technical support for the implem entation of the project References | Related Articles | Metrics

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Research on Anti-Cracking Performance of RC Circular Pier under Lateral Load FAN Wen-cai, ZHANG Nan, QUE Shu i-jie 2010, 29(4): 514-517.  Abstract ( )   PDF (313KB) ( )   Based on analysis of anti-cracking performance on RC structure by material mechanics, contrastive study of the calculation formula and data of the plastic influence coefficient of concrete under bending moment??was conducted. Taking the impact of section height during cracking on plastic parament??into conside ration, the calculation formula about cracking load of RC circular bridge pier pressure-bending model under lateral load was obtained based on balance principle of force and moment on circular section. Dynamic crack resistance model of piers and cracking load calcu lation were gained based on dynamic constitutive relationship of materials under impact load. The abovem ethod and calculation formula were verified by test of RC circular bridge pier model under lateral load and the impact of axial load on crack resistance property of RC circular section was discussed. References | Related Articles | Metrics

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Prediction Research of Long-term Creep for Bridge Concrete Based on Short-term Test XU Hang, PENG Xiao-ming , ZOU Li-qun 2010, 29(4): 518-520.  Abstract ( )   PDF (208KB) ( )   With the concept of BP-KX model for creep, a modified formula for computing creep coefficient of concrete bridge was obtained form short-term test data through linear regression approach. Comparisons among the regression analysis, test results and commonly-used prediction models for concrete creep in specifications showed that the predicted value by regression fitted in well with the test results References | Related Articles | Metrics

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Research on Stress,Deflection and Crack Monitoring System of Long-Span Continuous Rigid-Frame Bridge ZHANG Kai-hong, YAN Guo, ZHANG Ben-niu, ZHOU Zhi-xiang, XU Yong 2010, 29(4): 521-524.  Abstract ( )   PDF (439KB) ( )   Deflection of m id span and crack of box girder is the common disease among long-span continuous rigid-frame bridges. Methods and health monitoring system of the said bridge was studied due to its disease characteristics and causes. Them onitoring system was applied in Taipingzhuang Bridge to conduct a case study. Result showed that the system could monitor actual damage of bridges; it was sensitive and reliable, therefore it could be widely used in bridgem onitoring. References | Related Articles | Metrics

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Study on Crack Propagation of Ultra-thin Deck Pavement Based on Fatigue and Fracture Mechanics ZHUANG Yue-ming, YANG Yong-mei 2010, 29(4): 525-528.  Abstract ( )   PDF (300KB) ( )   Based on fracture mechanics, the crack propagation model was established with the finite element method. When bridge deck pavement repaving was conducted, the effect of pavement cracks on the over lay was analyzed in terms of stress intensity factor. The influence of cracks of different widths and different overlay thickness on the over lay crack propagation under the load and temperature stress was studied. Through the study, it was indicated that low temperaturew as the majo r factor for crack propagation. The thicker the overlay, the smaller the stress intensity factor of crack tip. A higher crack re??sistance was in need for ultra-thin bridge deck pavements References | Related Articles | Metrics

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Test and Analysis of Ventilation of Zhongliangshan Road Tunnel LIU Hong, WANG Xiao-wen, CHEN Jian-zhong 2010, 29(4): 529-532.  Abstract ( )   PDF (328KB) ( )   Zhongliangshan Tunnel,designed in the 1980s and the first extraordinarily long road tunnel in China, has been running for more than fifteen years. At present, the amount of traffic which passed the tunnel was two times of the designed one. Therefore whether the ventilation system became outdated with the aging of the tunnel needs investigating. Based on test of the amount of carbon monoxide, somke visibility and wind velocity, and analysis of the data, it was concluded that the right tunnel ventilation mode could meet the current demand for transport; while the left tunnel needed improving due to its unqualified smoke visibility and poorope ration environment. Technical suggestions for better operation of tunnels were made. References | Related Articles | Metrics

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Analysis of Expressway Construction Organization with Tunnel Group SHEN Qi-ming, WAN Xian-jin 2010, 29(4): 533-535.  Abstract ( )   PDF (170KB) ( )   A detailed study of main factors of expressway with tunnel group was conducted: transport routes, temporary engineering, temporary layout of facilities, water, electricity, telecommunications, networks, spoil site setting, geology, climate, hydrological conditions, avoiding overlapping sub-contract segment, favorable external coordination, etc. In order to avoid overlapping and enhance favorable external coordination, several main means of dividing contract section were obtained: single subtype, middle subtype, left and right segmented type, and hybrid type; difficulties of construction organization in expresshway with the tunnel group, namely difficulty of time organization and difficulty of space organization were discussed. References | Related Articles | Metrics

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Study on Lab Simulation Test on Capability of Reflective Cracking Resistance of Composite Pavement with Interlayer Layer LING Tian-qing, LI Xiu-lei, ZHANG Jian, ZHOU Qi-wei, ZHANG Shu-guang, ZHENG Zhi-neng 2010, 29(4): 536-539.  Abstract ( )   PDF (197KB) ( )   In order to explore the effect of different interlayermaterials on retarding reflective cracking of asphalt overlays on old cement concrete pavement, wheel tracking apparatus, closer to the actual situation, were employed to carry out simulation tests in the lab on the basis of lab simulation tests of anti-reflective cracking. Contrastive study was conducted on the effect of paving warp fiberg lass grating, FHGS high??strength fiberg lass composite geogrid ( hereinafter referred to as FHGS grid), fiberglass-polyester, rubber stress-absorbing layer and direct paving asphalt overlay. When cracks initially occurred, the number of rutting load of rubber stress-absorbing layer interlayers increased by 2.65 times, 2.26 times, 2.04 times and 1.61 times respectively. At the final cracking, the figures increased by 4.34 tim es, 3.97 times, 3.31 times and 2.61 times respectively. Taking the effect of size into account, it was suggested that priority should be given to FHGS in rigid-flexible pavement projects. References | Related Articles | Metrics

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Temperature Stress Analysis of Composite Roller Compacted Concrete Pavement HE Zhao-yi,ZHANG Pei-jia 2010, 29(4): 540-543.  Abstract ( )   PDF (343KB) ( )   3D pavement model of double-layer board on elastic foundation was establishd by using ANSYS finite element analysis software; in the case of curve temperature field, the influence of temperature warp stress, curve temperature field, different time, contact condition betweem layers, surface thickness, thermal expansion coefficient, modulus and plane size on thermal stress was studied. Analysis indicated that temperature stress was lower under nonlinear temperature field than that under linear temperature field; the thicker the plate, the later maximum thermal stress appeared; contact state exerted little influence on thermal stress while the impact of thickness, thermal expansion coefficient and modulus on thermal stress was significant References | Related Articles | Metrics

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Effect of Varied Tyre-pavement Interface on the Mechanical Behavior of Asphalt Pavement YIN Li-w en, DING Jing-sheng 2010, 29(4): 544-547.  Abstract ( )   PDF (232KB) ( )   When analyzing mechanical property of asphalt pavement, vehicle loading is considered to be transferred through tyres to the pavement and the interface between the tyres and pavement is assumed to be in regular geometric shapes to facilitate calculation. Three-dimentional finite element method was adopted to evaluate the response of asphalt pavement subjected to vehicle loading with variedtyre??pavement interfaces, including round, square, rectangular, elliptical,rectangular plus two semi-rounds, respectively. The results indicated that load ing through rectangular plus two semi-round interface imposed greatest effect on vertical displacement and shear stress of the whole pavement, as well as the tensile stress at the bottom of the surface upper layer. Loading through rectangular interface exerted greater influence on the tensile stress of the surface bottom layer than that of rectangular plus two semi-round in terface. Loading through round interface exhibited least effect on mechanical behavior of the pavement, though comparatively larger than square interface. References | Related Articles | Metrics

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Effect of Urban Heat Island on Temperature Fields and Performance of Asphalt Concrete Pavement GUO Yi-nan, ZHANG Hong-chao, WANG Jian, LU He-wei 2010, 29(4): 548-551.  Abstract ( )   PDF (354KB) ( )   The performance of asphalt concrete pavement is closely related to the temperature. The urban heat island, a local high temperature field, would lead to temperature difference between the city and the suburbs. Changes of mechanical properties caused by temperature difference would make urban asphalt pavement more fragile than the suburban one. In order to verify the case, the heat island intensity of the asphalt pavement structure in summer was measured, the influence of the intensity on resistance of deformation, selection of asphalt and standard of dynamic stability was studied through acceler?? ated pavement test and rutting test References | Related Articles | Metrics

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Impact of Steel Fibre Dosage on Mechanical Properties of Concrete under High Temperature CHEN Hui-guo, LIU Ying-feng, SUN Bo, WANG Min, CHENG Pei-jiang 2010, 29(4): 552-554.  Abstract ( )   PDF (333KB) ( )   With ISO-834, International Standard Fire Curve, steel-fiber reinforced concrete (SFRC) under high temperature was studied. The change rule of compressive and tensile strength of SFRC under high temperature and mechanical properties of SFRC were investigated. The test showed that the more steel fiber it contained, the better the concrete performed under high temperature. The test also indicated that steel fiber could promote the tensile strength of concrete considerably in any temperature and it could help improve the compressive strength only if the tempera ture was over 500?? . References | Related Articles | Metrics

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Test Study on Dynamic Modulus of Asphalt Mixture HE Chang-xuan, FAN Ying-hua, ZHENG Xiao-guang 2010, 29(4): 555-558.  Abstract ( )   PDF (540KB) ( )   Four types dynamic moduli of asphalt mixtures at different temperatures and frequencies were tested by Superpave Simple Performance Tester (SPT). According to time-temperature superpo sition principle, dynamic modulus master curves under different temperatures, frequencies and confining pressures were determined through nonlinear least square regression. High temperature stability was analyzed by the value of E* / sin . Contrastive study on compressive resilient modulus was conducted. The study indicated that types of mixtures, filler-bitumen ratio and confining pressure could exert great influence on high temperature stability of mixtures. Dynamic moduli could be impacted by types of mixtures, confining pressure and temperature. References | Related Articles | Metrics

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Study on Fatigue-Dissipated Energy Model of AC-13 Asphalt Mixture YAN Heng, ZHU Hong-zhou, TANG Bo-ming, GAO Shuang 2010, 29(4): 559-562.  Abstract ( )   PDF (267KB) ( )   By carrying out fatigue test under different conditions of AC- 13 asphalt mixture, the relation between dissipated energy per load and loading times was analyzed. The impact of test conditions on accumulated dissipated energy and fatigue life was studied through statistical methods. The result indicated that the relationship between accumulated dissipated energy and fatigue life was relevant to load mode while it had nothing to do with test temperature and loading frequency. References | Related Articles | Metrics

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Water Damage Property of AC Hot Asphalt Mixture by Various Factors LU Xue-yuan 2010, 29(4): 563-567.  Abstract ( )   PDF (417KB) ( )   A ccording to orthogonal experimental design, factors influencing freezing-thawing splitting strength of AC- 13 and AC－20 modified asphalt mixture as well as their relativiy were studied. Through the test, it was demonstrated that the gradation composition played a desicive role in determining the AC－13 asphalt mixture freezing-thawing splitting strength, while it exerted little influence on the OAC; VV and sand equivalent value were crucial factors forAC- 20 asphalt mixture freezing-thawing splitting strength; there was a good linear relationship between freezing-thawing splitting strength and Marshall performance index. Suggestions for improving construction quality were made. References | Related Articles | Metrics

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Experimental Analysis of Highway Deicers in the Application of Alpine Areas in Southwest China GAO Jian-ping, YAN Nan, LIHai-ying, SHAO Dong, CHE Yong 2010, 29(4): 568-570.  Abstract ( )   PDF (307KB) ( )   According to climate characteristics of alpine areas in southwest China, five deicers including NaCl , CaCl2, MgCl2. 6H2O, KAc, Ca(Ac)2 .H2O were applied in the ice melting test under the temperature－5^C ,－10^C. and - 15^C. The result was as follows: chloride deicers generally performed better than acid deicers; there was tiny difference between them elting capacity of the KAc and that of chloride deicers; CaCl2 can cause ice crack and partial looseness. Taking highway mobility, temperature, environmental requirements, and the severity of ice / snow impact into consideration, the deicer in alpine areas in southw est China was proposed in the present paper. References | Related Articles | Metrics

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Laboratory Study on Performance of Large Pores Cement Treated Permeable Base CAO Yu-ling 2010, 29(4): 571-575.  Abstract ( )   PDF (183KB) ( )   Through lab experiments, material requirements, mixture ratio, method of compacting, strength characteristics and resilient modulus in compression of the large pores cement treated permeable base were studied. The conclusions were as follows: selection of maximum grain size of aggregates should be based on the drainage layer^s thickness and structure strength requirements; cement content, C /A and volume of entrapped air Va would be significant factors in affecting the compressive strength of the large pores cement treated permeable base; the static compacting method of test sample should be adopted in constructing large pores cement treated permeable base instead of vibrant compaction; aggregates with lower crushing value were required References | Related Articles | Metrics

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Characteristic Analysis of the Damaged Retaining Wall in Wenchuan Earthquake QIU Yan-ling, YAO Ling-kan, QIN Wei 2010, 29(4): 576-581.  Abstract ( )   PDF (412KB) ( )   Almost 20-km retaining wall along G213 Highway (Maanshi tunnel to Yingxiu section, more than 30km ) was investigated. The results were as follows: debris of the retaining wall were scattered in the region with seismic intensity of 9 degree and partial destruction could be seen at 10 degree; seismic intensity and material of walls were fundam ental factors for seismic damage, height of walls and routed irection also exerted in fluence on seismic damage; retaining walls on rock were mainly inclined while retaining walls on soil had both inclining and sliding deformation; the average vertical maximum deformation part was as high as about 50% of retaining wall. Based on the analysis above and numerical simulation approach, some counterm easures in retaining wall seismic design were proposed. References | Related Articles | Metrics

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Calculation Method of Slope Stability Safety Factor Based on the Drucker-Prager Criterion XIONG Huan, XIAO Sheng-xie 2010, 29(4): 582-586.  Abstract ( )   PDF (287KB) ( )   Calculation method of slope stability safety factor was proposed based on the Drucker- Prager criterion. Currently, the Mohr-Coulomb hexagon circumcircle Drucker- Prager criterion was adopted in the ANSYS program. For homoge?? neous slope, the safety factor with the Mohr-Coulomb hexagon circumcircle Drucker- Prager criterion was calculated by using ANSYS, therefore the safety factor could be obtained with the deduced conversion form ulae based on the Drucke r- Prager yield criterion. For the slope with multi-layer, the transformation of Drucker- Pragercr iterions was achieved by employing the value of c, ??of each layer, therefore the safety factor could be obtained based on the Drucker- Prager yield criterion. A series of case studies demonstrated the feasibility of the proposed method. References | Related Articles | Metrics

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Fuzzy Comprehensive Evaluation Method Based on Entropy in Road Flood Risk Assessment ZENG Rong, CHEN Hong-kai,LI Jun-ye 2010, 29(4): 587-591.  Abstract ( )   PDF (196KB) ( )   Due to the complexity, ambiguity and uncertainty of road flood risks, entropy weight method was employed to determine risk index weights based on fuzzy mathem atics and establish a fuzzy comprehensive evaluation model on the basis of entropy weight. The evaluation model was determined by relationship among different indexes instead of subjective judgement. The evaluation results could be obtained by integrating objective weight and subjective evaluation by experts. After conducting a case study of flood risk evaluation in Yuqian Expressway, it was demonstrated that the model could exactly show highway flood risk degree therefore it was feasible and valuable in practice. References | Related Articles | Metrics

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Safety Assessment of First-Class Highway Design Based on Unascertained Measurement Model TU Sheng-wen, GUO Xiu-cheng, SU Zhou 2010, 29(4): 592-596.  Abstract ( )   PDF (228KB) ( )   In order to provide quantity evaluation for the first class highway, index system of safety assessment for the design of the first class highway was built. Regarding the characteristics of uncertainty on the relationship between design factors of highways and traffic safety, the unascertained measurement model of safety assessment for the first??class highway design was established. Through unascertained measurement of single indicator, calculation of multiple indicators comprehensive measurement and indicators weight determination process, comprehensive assessment of first??class highway design was realized. Studies indicated that it is theoretically feasible to use unasce rtained measure model to study safety evaluation problem of first??class highway design and assessment results are credible, thus providing a new approach for safety assessment of high?? way design under unascertained conditions. References | Related Articles | Metrics

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Road Network Design for Hazardous Materials Transportation Based on Bi-level Programming CHU Qing-zhong, ZHANG Jia-ying, Xie Zhi-quan 2010, 29(4): 597-603.  Abstract ( )   PDF (536KB) ( )   After analyzing bi-level characteristics of transportation design, a bi-level transportation planning model with government's expectation of risks minimization and transporter's expectation of costs minimization was developed. With Pydev as its platform, calculation and results could be achieved based on Python programming and TransCAD through genetical?? gorism. Through case study, it was indicated that optimal so lutions could be obtained through generic algorithm and the outcome, close to the lowest network risk was in agreement with expectation. References | Related Articles | Metrics

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Research on the Angle to Truck Escape Ramps of Mountain Roads NIU Jian-feng, WANG Jun-hua, Dong Xian-yuan 2010, 29(4): 604-608.  Abstract ( )   PDF (254KB) ( )   Field investigation and access to relevant information were used to determine the main vehicle style of traffic accidents on the long and steep downgrade mountain road in our country and the speed of truck escaperamps. In order to ensure the lateral stability of vehicles in traveling, the relationship between the angle to truck escape ramps and the radius of the main line flat curves, with main line turning right as the main study object was researched through the track geometry characteristics of brake failure vehicles from mainline pass into truck escaperamps. Finally reasonable range of truck escape ramps angle was established, which provided a necessary theoretical reference for selecting the angle to truck escape ramps of mountain roads in our country. References | Related Articles | Metrics

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Study on Engineering Measure Improvement Level of Elevated Road Out-ramp Area Based on VISSIM Simulation CHEN Ying-xue, WU Bing 2010, 29(4): 609-612.  Abstract ( )   PDF (243KB) ( )   Based on summary of the reason of traffic congestion in joint area, a list of feasible engineering measures was made in the thesis. Simulated the measures by using VISSIM software modeling a typical ramp, for example, it was indicated that the interference of bicycle and pedestrian was vital to the whole traffic system. The degree of improvement of extending the length of join t area through the evaluation on various traffic condition of different length of joint areaw as also studied. As a result, a theoretical basis of whether or not and how to take an engineering measure of out-ramp area in Shanghai as well as in China was provided References | Related Articles | Metrics

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Traffic Incident Duration Time Prediction Model and Parameters Calibration JIYANG Bei-bei, ZHANG Xiao-ning, SUN Li-jun 2010, 29(4): 613-615.  Abstract ( )   PDF (306KB) ( )   Effective traffic incident management should be based on accurate prediction of incident durations. Traffic incident duration includes four parts: detection time, response time, clearance time and recovery time. Based on CTM, traffic incident duration prediction model and parameters calibration method were proposed. Measured data and simulation results showed that duration time prediction model based on CTM had a higher precision References | Related Articles | Metrics

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Design and Development of Urban Traffic Information Release System HUANG Mei-ling, TANG Wei, GAO Wei, LING Li-an, LU Bai-chuan 2010, 29(4): 616-619.  Abstract ( )   PDF (391KB) ( )   Goals of systematic construction, functional requirements and constituent parts of the system were introduced; road traffic, traffic accidents and the shortest route were analyzed. Based on urban traffic in Chongqing, road information and traffic information were studied by establishing models. With the 2nd development technology of MapInfo, an urban traffic information release system with its main functions of analyzing road traffic information, traffic accident and space was established. References | Related Articles | Metrics

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Formation Mechanism of Construction Spoil Debris Flow in Chongqing Reservoir LIU Fei,TANG Hong-mei 2010, 29(4): 620-623.  Abstract ( )   PDF (265KB) ( )   From systematic ana lysis of the geological environment in which Chongqing reservoir construction spoil debris flow developed, it was found that it was probable to occur large and extra large debr is flow disaster in Chongqing reservoir; from the analysis of 10 factors such as groove gradient, groove roughness, water catchment area and flood peak, the stability condition of Chongqing reservoir constrction spoil debris flow and form initiation mechanism of the debris flow was discovered; the construction spoil of Lijia Valley, Fengjie county, Chongqing reservoir was taken to demonstrate that construction spoil activity could be determined by actual checking, which could provide scientific basis for effective prevention and control of debris flow. References | Related Articles | Metrics

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Improved Dynamic Programming Algorithm for Traffic Engineering Routine Application of Safety Management System DING Xiao-bing 2010, 29(4): 624-627.  Abstract ( )   PDF (243KB) ( )   After analyzing current safety condition of rail transit construction projects, data collection and collation by using rail traffic engineering safety management system was proposed; the optimal rail transit project construction period was obtained after analyzing data through improved dynamic programming mode.l As a result, the cost of rail construction could be cut to a certain extent which made this paper innovative and practical. References | Related Articles | Metrics

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Harbor Safety Evaluation System in the Three Georges Reservoir Region WANG Xue-jun, QIN Lei,CHEN ying 2010, 29(4): 628-631.  Abstract ( )   PDF (218KB) ( )   Harbor safety in Chongqing after establishment of Three Gorges was analyzed; the importance of safety factors was put forward after establishing the security system of harbor; harbor safety was evaluated through fuzzy AHP generalization References | Related Articles | Metrics

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Ship Model Test Research on Navigation of the Three Gorges Electricity Station between Two Dams at Peak Regulation in Flood Season CAI Ru-zhe, CHEN Min, CAI Chuang, ZHENG Tao 2010, 29(4): 632-635.  Abstract ( )   PDF (244KB) ( )   Thew aterway between the Three Gorges dam and the Gezhouba dam is zigzag and changeful and the flow condition is complicated. The peak regulation on the Three Gorges electricity station will inevitably lead to changes in water-flow conditions, thus causing adverse impact on navigation. According to the requirements of the topmost safety limit of ship model test, this paper analyzed changes of the maximal rudder-angle, the maximal drift-angle, the speed of ship opposite the bank and the navigation time of the fleets upstream and downstream navigation of different fleets at each key leg at peak regulation in flood season. Besides, the navigational conditions at peak regulation in flood season were demonstrated to ensure safe navigation of ships through this leg. The optimal route, navigation mode and difficult points of navigation were presented. References | Related Articles | Metrics

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Experimental Study on Flood Discharge and Energy Dissipation Structure for Menkantan Hydropower Station LIU Jian, DENG Yi-ping, YANG Sheng-fa 2010, 29(4): 636-640.  Abstract ( )   PDF (504KB) ( )   Based on hydraulic model experiments a series of problems about discharge floodwater and energy dissipation of Menkantan Hydro-power Station were found. An optimum plan with better flood discharge and energy dissipation ability were proposed. Analysis of model tests demonstrated that flood discharge and energy dissipation ability of the plan could meet the project demand References | Related Articles | Metrics

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Design of Mobile Communication Network in Ports WANG Xian-bing 2010, 29(4): 641-645.  Abstract ( )   PDF (236KB) ( )   Due to needs for communication in ports and development of internet, a mixed network, composed of wired switch and wireless accession was proposed after analyzing technical features and keytechnologies of WMiAX. Wireless accession could provide mobile accession for people and wired switch could offer high datarate to people. Structure of WMiAX network was determnied and a network plan with intelligence, flexibility and low cost was raised. References | Related Articles | Metrics

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Performance Test Research of Cast-in-place Concrete YUAN Yuan, FAN Jie-qun, YUAN Gui-rong 2010, 29(4): 646-649.  Abstract ( )   PDF (386KB) ( )   Through on-site investig ation, changes of load borne by each floor with the ongoing process of upper parts were studied. Based on analysis and discussion of test results, it was found that changes of stress were significant when top slab concrete was being poured and the support was temporarily remov ed, which greatly impacted structure safety. Under temporary stress system, the longer the construction period and removal period, the smaller them aximum stress, which could improve structure safety. References | Related Articles | Metrics

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Integral Lifting Technology of Boeing Hangar Roof at Pudong Airport CHEN Dong-dong, YAO Gang, YUAN Xu-dong, DIAO Wei 2010, 29(4): 650-653.  Abstract ( )   PDF (500KB) ( )   The 163 x 100m roof structure of Boeing hangar at Pudong airport consists of truss and steel frames. A general construction plan of“ground assembly and twice in tegral lifting” was employed. The program and its key technologies such as safeguard mesures in the air and load transferw ere described. Besides, integral lifting via MIDAS/Gen calculation was expounded. Based on analysis of structure stress and change rule of joints displacements, certain measures were adopted to achieve synchronous lifting, making the 2000-t steel structure successfully lift 34 meters. References | Related Articles | Metrics

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Development of Vehicle Idling Stop and Start Simulation Experiment System HUANG Da-xing , HE Ren,CHEN Qing-Zhang 2010, 29(4): 654-658.  Abstract ( )   PDF (437KB) ( )   Due to poor economic performance of fuel of vehicle with internal-combustion engine in idling mode, the working mechanism of idling stop and start system was analyzed in the paper. And the simulation experiment system was developed based on them echanism. Through working param eterstest, vehicles working condition including idling, braking, stopping or starting (restarting) could be determined. Through simulation system control , the stop and start-up process of engine were analyzed. After a simulation analysis of vehicle regenerative braking performance with Matlab/Simulink under NEDC, it was indicated that economic performance of vehiclefuel had improved greatly. References | Related Articles | Metrics

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Experimental Modal Analysis of a White-body Mini Car ZHU Mao-tao, FAN Jun, HE Zhi-gang, ZHOU Kong-kang, LI Feng 2010, 29(4): 659-662.  Abstract ( )   PDF (276KB) ( )   The basic theory of experim ental modal analysis was introduced. Dynamic characteristics were studied based on the vibrations of a certain white-body mini car. Through experiments of vibration and mode experiments, different modal frequencies and modal characteristics of the car were acquired. Based on drawbacks in dynamic characteristics and working frequency of vehicles, suggestions were made for designers to improve mini-car structures References | Related Articles | Metrics

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No-margin Assembly Technology of 5,500 DWT Oil Tanker LEI Lin, WANG Zhi-xiang, ZHANG Min, LI Ming-yi 2010, 29(4): 663-666.  Abstract ( )   PDF (328KB) ( )   No-margin assembly technology plays an important process in shortening the building cycle, decreasing labor intensity and production cost and improving ship building quality and production effeciency. No-margin assembly can usually be achieved through section no-margin or section pre-dressing method. In order to build the 5, 500 DWT oil tanker with no-magin building berth assembly technology, the reality of building industry was studied, relevant technologies at home and abroad were analyzed, and finally no-margin parallel middle body building berth assembly technology scheme based on subassembly pre-dressing method was established References | Related Articles | Metrics