Archive

20 December 2008, Volume 27 Issue 6 Previous Issue    Next Issue

---

For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

Select

Analysis of Curved Box Girder's Force Condition under Prestressed Radical Force XIANG Zhong-fu, BIAN Ming-zhi, LIANG Tian-tian, ZHU Ci-xiang 2008, 27(6): 1009-1013.  Abstract ( )   PDF (326KB) ( )   Through theoretical analysis and model pilot study,the different mechanical models of the curved beam under the radical force are compared.The distribution of the radical force in the curved box girder and the influence of anti-collapse of steel area and the prestressed wire's protective layer thickness are analyzed.Besides,the radical force's impact on the crack and the responsive measures are also discussed.The fitting formula of radical force and anti-collapse of steel area is proposed,which can serve as a reference for the design and construction of the curved box girder. Related Articles | Metrics

Select

Dynamic Response of Simply-Supported Bridge under Moving Vehicular Loads CHEN Rong-feng, ZHANG Quan, ZHANG Jian-li 2008, 27(6): 1014-1016,1150.  Abstract ( )   PDF (269KB) ( )   Bridge and vehicle are treated as two separate systems.1/2 four free degree vehicle model is proposed;their dynamic equations are established with the adoption of virtual work theory.According to the power spectral density function advised by GB/T 7031-1986,different values of different bridge deck roughness are obtained.The time-domain response of the simply-supported beam in different bridge deck roughness caused by moving vehicle is obtained by numerical simulation,and the variety rule of impacting factor is also obtained.The result shows that the value of impacting factor increases along with vehicle velocity but not linearly along with the grade of highway bridge deck roughness.The grade of bridge deck roughness is the most remarkable factor influencing vehicle dynamic effect. Related Articles | Metrics

Select

Research on the Reasonable Finished Dead State of Concrete Cable-Stayed Bridges LI Yi, YAN Dong-huang, LI Xue-wen 2008, 27(6): 1017-1019,1023.  Abstract ( )   PDF (298KB) ( )   In terms of the determining principles,influential factors and determining methods of the reasonable finished dead state of the concrete cable-stayed bridges,a comprehensive method is developed.The procedure of this method is: deciding the initial dead state by using the minimum bending energy method firstly;then optimizing the cable forces by using the influence matrix method.And finally the reasonable finished dead state is determined.This method is used to calculate an actual bridge,and the result of the example shows that it is easy to operate and effective. Related Articles | Metrics

Select

Analysis on Sensitivity of Parameters of Cable-Stayed Bridge Based on Geometry Control Method WU Guo-sheng, YUAN Bao-jun 2008, 27(6): 1020-1023.  Abstract ( )   PDF (277KB) ( )   Taking the construction control project of Yangtze River Highway Bridge from Suzhou to Nantong as an example,the model of entire bridge is established to simulate the whole construction process in terms of basical ideal of geometry construction control method,and then the unstressed configuration of steel box girder and unstressed cable length in the service stage are found out.In the light of the completed bridge,the effect on the configuration and stress with the change of various parameters is analyzed on the condition of ensuring unstressed configuration of steel box girder and unstressed length of cable.The parameters include self-weight of steel box girder,stiffness of cable,temporary load during construction process and etc. Related Articles | Metrics

Select

Study on Load Test of Dayan River Bridge and Its Design and Construction HU Xu-hui, GU An-bang, LUO Ling 2008, 27(6): 1024-1026,1045.  Abstract ( )   PDF (318KB) ( )   Dayan River Bridge is a 25 m simply-supported highway bridge of box girder with corrugated steel webs.The design methods about the girder body of superstructure are mainly analyzed,such as the design of structure,corrugated steel webs,shear connecter and beam deformation,manufacture and installation of steel webs,key construction technology of the external prestressed bundle and study on load test.The results show that the experience gained in the construction of Dayan River Bridge has guidance meaning for the construction of similar bridges. Related Articles | Metrics

Select

Study on Characteristics of Vibration of Kaixian Zhaojia Bridge LIAO Yu-chun, SHI Shang-wei 2008, 27(6): 1027-1030,1061.  Abstract ( )   PDF (261KB) ( )   The vibration of bridge under the vehicle is caused by various vibrations.It is related with many factors,such as bridge dynamic characteristics,vehicle characteristics,speed,the car-bridge coupling function and the smoothness of the bridge deck.Through the systematic analysis and research on the measured data which cause the shock and vibration of Zhaojia bridge,it is found out that when driving on the non-large-span bridges,the speed at 10~20 km/h for the cross-bridge will result in more dynamic response,and the impact factor in the peak occurs at 10~20 km/h;when the bridge natural frequency is close to that of experimental cars with three-axis,the car-bridge coupling frequency vibration is easy to result in abnormal shock and vibration even on the deck with good circumstances.There are many factors leading to the abnormal shock and vibration of the car,however,that a variety of factors operate jointly is the decisive factor in abnormal vibration of the bridge.The combined effects of the factors are not simple weighted relations.When a variety of conditions are in the state of coupling match,the impact factor will increase doubly. Related Articles | Metrics

Select

Research on the Strengthening Technology of Replacing Concrete in Mid-span of the Continuous Rigid Frame Bridge QIN Xu-yong, LIU Ding-bo, XIONG Qian 2008, 27(6): 1031-1033.  Abstract ( )   PDF (235KB) ( )   The closure section concrete has lamination phenomenon in mid-span of the continuous rigid frame bridge.Aiming at this rare disease,through the calculation and analysis of the entire bridge structure and the mid-span cross partial structure,the creative reinforcement method of replacing concrete with externally applied pretressing is proposed;the advanced construction technology of eliminating concrete by high-pressured water jet chisel is also introduced.Furthermore,through analyzing the data obtained by all-the-way tracking monitoring the construction and the load experiments,it is showed that the strengthening technology is effective and feasible in construction.This strengthening technology offers a universal method to the bridges which occur similar disease,and it also offers precious experience to the popularization of the advanced construction technology of high-pressured water jet chisel. Related Articles | Metrics

Select

Design Strategies of Breaking Resistance of Tunnels Crossing Active Faults Zone JIANG Shu-ping, LI Peng, LIN Zhi 2008, 27(6): 1034-1036,1041.  Abstract ( )   PDF (263KB) ( )   Aiming at the problem of structure design of a highway tunnel crossing active faults zone,protective design strategies of breaking resistance are put forward;and then over-excavation and articulated design are discussed.The calculation methods of the length of the single segment geometry and the shear stiffness of the joints are proposed.In addition,tunnel element kinematics after joint rupture is analyzed. Related Articles | Metrics

Select

The Combination of Bridge and Architecture——Study on the Historical Development and Characteristics of “the Inhabited Bridge” YANG Chun-xia 2008, 27(6): 1037-1041.  Abstract ( )   PDF (447KB) ( )   The inhabited bridge combines the bridge and building,adds many functional spaces,and attracts people to settle on it.Thus it shows a striking contrast to the modern bridges which mainly serve as fast traffic tools.Through the historical retrospect,the characteristics of the inhabited bridges different from modern bridges are analyzed,such as mainly serving for pedestrians,providing comfortable settling spaces,and being in harmony with environments;then the rewarding inspiration of the inhabited bridge to the modern bridge design is summarized.Furthermore,it is pointed out that the present bridge construction should make progress on four aspects,in order to satisfy man's demands,compound abundant settling functions,shape water-seeing open spaces,and harmonize environments. Related Articles | Metrics

Select

Study on Noise Character of Highway Tunnel ZHU Wen, MA Fei, HE Chuan, WANG Yang 2008, 27(6): 1042-1045.  Abstract ( )   PDF (314KB) ( )   Through the noise level tested by fieldwork,the noise level of highway tunnel is griped.Using multimedia technology,noise frequency character analysis and the waveform identification are carried out.The result shows that noise wave-form of cement concrete pavement is rectangular wave and asphalt concrete pavement is sine wave.The noise spectrum graphs of the two kind of pavement have obvious differences in distribution.The study is significant to improve the safety and comfort of driving in tunnel. Related Articles | Metrics

Select

Application of GPS Positioning Technology to the Level Control Survey of the Expressway in Mountainous Area XIE Zheng-jun, PAN Guo-bing, SONG Li-de 2008, 27(6): 1046-1049.  Abstract ( )   PDF (349KB) ( )   GPS system is a kind of navigation and position ing system directed by satellite,which adopts the distance intersection method.It is used widely in the field of measurement.Taking Hong-You Expressway for example,the measurement procedure of using GPS in mountainous area with complex landform is explicated.The choice of coordinate system,the setting,data gathering and data processing methool of control network are also explicated.It provides guidance to the personnel who engage in the measurement of the expressway in mountainous area. Related Articles | Metrics

Select

Study on Typical Concrete Pavement Structure of Countryside Road in Chongqing Mountainous Area YANG Xi-wu, DUAN Bing-jun 2008, 27(6): 1050-1054,1070.  Abstract ( )   PDF (391KB) ( )   Based on the results of countryside road pavement state investigation in Chongqing Wuxi county,the method of classification of countryside road is presented and the countryside road in Wuxi county is divided into four classes by the new method of classifying.According to the condition of traffic and the resources of pavement building materials for the countryside road,the typical concrete pavement structures for Chongqing Wuxi countryside road are given.The research achievement is worth to be reference to other mountainous countryside road pavement designing. Related Articles | Metrics

Select

Correlation of the Static Creep Stiffness Modulus with the Dynamic Stability for Asphalt Mixtures FAN Tong-jiang, HE Zhao-yi 2008, 27(6): 1055-1057,1138.  Abstract ( )   PDF (298KB) ( )   The dynamic stability (DS) obtained by the wheel tracking test can indicate that the rutting behavior of asphalt pavement at high temperature has better consistency,but it can't be used in the design of asphalt pavement structures as a parameter.However,through studying the development of correlation of DS with the static creep stiffness modulus,the DS and static creep stiffness module are tried to be design parameters of the asphalt pavement structures.Therefore,asphalt mixtures made of the two grading for AC13 and AC25,the two binders for conventional bitumen 60#/70# and modified bitumen with 5%SBS,the two aggregate for granite and lime stone are chosen to be carried out the wheel tracking test and the static creep test respectively.In the wheel tracking test,the thickness of rutting test specimens 5 cm and 7 cm is used respectively.The results show that to the same grade,binder,aggregate and thickness of wheel tracking test specimens,a good correlation is between the DS and the static creep stiffness module of asphalt mixtures and the correlation coefficient R2 is over 0.9.However,when considering synthetically different grade,binder,aggregate and the thickness of wheel tracking test specimens,R2 of them is only 0.591 2 and that is not ideal.So the further research on the feasibility of transforming DS into the static creep stiffness module as a structure design parameter of asphalt pavement will be carried out. Related Articles | Metrics

Select

Study of Rut Deduct Value in Asphalt Pavement Condition Index KONG Ling-yun, SHEN Juan, ZHOU Jin-chuan 2008, 27(6): 1058-1061.  Abstract ( )   PDF (263KB) ( )   According to the study of the rutting conversion factor calculating method at home and abroad,as well as the measured data of the entity engineering and the comparative analysis of actual traffic on the existing track,the advantages and disadvantages of the current rut deduct value are analyzed.Furthermore,continuous type calculating formula of rut deduct value is proposed.Research shows that: according to the PCI gained by the current track conversion factor,most of the index values have larger deviations than the actual road conditions do;however,the PCI gained through the rut conversion factor formula mentioned above possesses better consistency with actual road conditions. Related Articles | Metrics

Select

Study on the Application of Texture Depth to Segregation Evaluation of Asphalt Pavement Mixtures YUAN Guang-quan, GAO Guo-hua, ZHOU Jin-chuan 2008, 27(6): 1062-1066.  Abstract ( )   PDF (305KB) ( )   Segregations occur during the construction of asphalt pavement to different extent.In order to apply TD to evaluating segregation,the sand patch test has been used to inspect in the surface macro-texture of sub-course,and PQI (Pavement Quality Indicator) tests are conducted at each sand-patch location.Correlation between voids and surface texture ratios is analyzed as the standard of segregation evaluation,in order to satisfy the qualitative requirements of TD corresponding with the range of void ratios. Related Articles | Metrics

Select

Experimental Research on Fatigue Performance of Asphalt-Treated Base ATB 25 Mixtures ZHU Hong-zhou, TANG Bo-ming, GAO Shuang, HE Zhao-yi 2008, 27(6): 1067-1070.  Abstract ( )   PDF (247KB) ( )   Fatigue performance of asphalt-treated base mixtures is a key influence factor to the service life of asphalt pavement.Five types of ATB 25 asphalt mixtures are tested by the third-point flexure fatigue test of control stress mode.In succession,effects of aggregate gradation and asphalt property on fatigue performance of asphalt-treated base are analyzed.Research shows that it has no obvious differences in fatigue performance of asphalt mixture with different aggregate gradation,which indicates that asphalt treated base adopting lower grade asphalt is more sensitive to variation of stresses.Through the regression analysis of fatigue test results and the consideration of shift factor,the fatigue model of asphalt treated base is obtained.These results can offer reference in asphalt-treated base pavement design. Related Articles | Metrics

Select

Comparative Test Study on Design Method of Bituminous Stabilized Macadam Mixtures HE Zhao-yi, ZHANG Zheng-guo, HUANG Gang 2008, 27(6): 1071-1076.  Abstract ( )   PDF (354KB) ( )   Aiming at the bituminous stabilized macadam mixtures with 9 types of gradation and 3 types of asphalt,the comparative test study of bituminous stabilized macadam mixtures is carried out systematicly through large Marshall method,superpave rotate compaction method and GTM method.The relationships of volume and physical strength indexs of three types design methods are established.Finally,the design method of bituminous stabilized macadam mixtures under heavy traffic condition is recommended. Related Articles | Metrics

Select

Analysis on Factors Influencing Moisture Stability of Bituminous Stabilized Macadam Based on Grey Correlation Entropy Method XU Song, TANG Bo-ming, ZHU Hong-zhou, HE Zhao-yi 2008, 27(6): 1077-1080.  Abstract ( )   PDF (237KB) ( )   There are some factors influencing the moisture stability of bituminous stabilized macadam,including asphalt property,aggregate property,asphalt mixture performance,construction condition and environment.Among these factors,finding out key influence factors possesses substantial significance to control moisture stability of bituminous stabilized macadam.The degree of various factors influencing the moisture stability of bituminous stabilized macadam is studied through grey correlation entropy.These influence factors include asphalt penetration,passing percent of 4.75 mm mesh,passing percent of 0.075 mm mesh,nominal biggest dimension of aggregate and asphalt dosage,voids ratio,saturation,fill-bitumen ratio of asphalt mixture.The results show that the main factors influencing the moisture stability of bituminous stabilized macadam are asphalt dosage,saturation of asphalt mixture,asphalt penetration and voids ratio of asphalt mixture. Related Articles | Metrics

Select

Design of Mix Ratio of the Lime-Fly Ash Stabilized Macadam Based on the Anti-crack Performance LIU Shu-yan, WANG Qing-zhou, CHEN Liang, WEI Lian-yu 2008, 27(6): 1081-1085.  Abstract ( )   PDF (308KB) ( )   Firstly,the best composition of the lime-fly ash mortar is determined by the orthogonal study,based on many indoor experiments and theoretical analysis;secondly,the rate of voids in the mixed aggregates is gained by the method of vibrating test,in which the optimal gradation of coarse aggregates is got.At last,the suited ratio of coarse aggregates to ash-fly mortar is determined by the volume method.Through the computation and experiment,the design of mix ratio of lime-fly ash stabilization macadam based on anti-crack performance is proposed.Through the research on the pavement behavior and performance of anti-crack lime-fly ash stabilization macadam,including the mechanical performance,anti-brushing performance and anti-crack performance,it proves that lime-fly ash stabilization macadam determined by this method has higher strength ratio and better anti-cracking performance. Related Articles | Metrics

Select

Performance Study on Cement and Red Mud Stabilized Graded Crushed Stones LIANG Xu, LIANG Nai-xing, ZENG Jian-min, MEI Ying-jun, YU Wei 2008, 27(6): 1086-1089.  Abstract ( )   PDF (328KB) ( )   Through measurement of the physics property,mixture ratio design and the best moisture content of mixture of cement and red mud stabilized graded crushed stones raw material,the characteristics of cement and red mud stabilized graded crushed stones are analyzed from several aspects: unconfined compressive strength,splitting tensile strength,ultrasonic method used to measure modulus of elasticity,compression rebound modulus,frost resistance and solidified mechanism.The results of study show that: every function of mixture with red mud is better than that without adding the red mud;and after synthesizing other lab test results,the best volume range of adding red mud into mixture is determined as 10%~16%. Related Articles | Metrics

Select

Research on Simulating Settlement of Disposing Foundation of High Liquid Limit with Gravel Pile by Centrifugal Test WU Guo-xiong, ZUO Yang, LIAO Jun-tang 2008, 27(6): 1090-1094.  Abstract ( )   PDF (382KB) ( )   High liquid limit soil is a special kind of soil which is harmful to the engineering.In order to dispose the foundation of the high liquid limit soil,a centrifugal model test has been chosen,which uses the centrifugal power brought by centrifugal machine to improve the bulk power of the model and to form the man made gravity.The consolidation state of high liquid limit soil after the gravel pile is simulated,and meanwhile the deformation and subsidence of foundation model is observed.Through analysis of centrifugal model test,it is showed that the measure of gravel pile compound foundation improves stress and deformation behavior of foundation,and enhances the stability of foundation greatly. Related Articles | Metrics

Select

Finite Element Simulation Analysis of Seepage Caused by Slope Excavation ZHANG Yi, ZHANG Xu-jin 2008, 27(6): 1095-1098.  Abstract ( )   PDF (261KB) ( )   Seepage is the key factor to undermine the soil slope and to make it lose the stability,which reduces the effective stress and the shear strength of soil.It is obvious that slope excavation is inescapable in the construction of the road.Using FEM,the influence of slope excavation on seepage fields of slopes during the road construction is analyzed through the introduction of boundary conditions and constraints of seepage model.Taking some road slope as an example,the excavating process,pressure water head and velocity profile are simulated under the influence of rainfall infiltration.The results show that the velocity of the specified section increases after the excavation.The influence of seepage change on slope stability is also analyzed simply. Related Articles | Metrics

Select

Numerical Simulation of the Landslide Movement in Xujiazhai in the Highway from Taiyuan to Dalian DU Yong-bin 2008, 27(6): 1099-1102.  Abstract ( )   PDF (283KB) ( )   The analysis theory of discrete PFC is introduced,and the calculating model is established on the base of cutting landslide of highway from Taiyuan to Dalian.The principle of particle flow code analysis method is introduced and applied to simulate a real case of a cutting landslide.The joints are formed using different property balls.The movement process of the landslide is calculated and forecasted and the deformation of the whole landslide,displacement and stress of various positions are analyzed.The slip of upside powder clay results from ripping within itself,while downside gravel slip results from retaining wall's destruction and the tense stress changes little.The 2 slide planes are pointed out and the suggestions for treatment are provided. Related Articles | Metrics

Select

Analysis on Stability Evolvement of Loose Soil Landslide in the Case of Absorbing Strength Degradation CHEN Tao, TANG Hong-mei 2008, 27(6): 1103-1107.  Abstract ( )   PDF (372KB) ( )   It is universally acknowledged that soil strength degradation and creep under water-Absorption are main factors of startup of landslide.Taking Feng Jiaba landslide in Wushan as an example,owing to the physical and intensive parameters of loose soil with different saturation got from laboratory tests,the trend of stability evolvement of loose landslide under rainfall is got by using Finite Element Method to simulate through the software ANSYS.The results indicate that the point with maximum displacement is in the rear of landslide,and the value increases nonlinearly when the saturation of the soil arises.Plastic area occurs in the rear of landslide,and it enlarges continuously when the saturation arises.The stability of the landslide decreases when saturation arises,and it reaches minimum limit equilibrium state when the soil is complete saturation.As Feng Jiaba slope is at the state between instability and stability,it may develop into disaster with the permeability of prolonged continuous rainstorms and the water-dipping of Three Gorges Project's Ⅲ-phase. Related Articles | Metrics

Select

Stability Evaluation of High-Cutting Coal Measure Slope along Highway CUI Zhi-bo, CAO Wei-wen, TANG Hong-mei 2008, 27(6): 1108-1111,1163.  Abstract ( )   PDF (410KB) ( )   High-cutting slopes have to be employed during highway construction in mountainous area,which will always break the original balance of the rock stresses.These impose more geological risk to the high-cutting slopes' stability.Taking the high-cutting coal measure rock slope at Wushan-Wuxi road from K 90+310 to K 90+370 as the research object,the evaluation of the whole and part stability of this slope is made out by stereographic polar projection method and finite element method.The result shows that the dominant rock fracture influences the slope's integer stability,whereas the coal measure influences part stability.The system combined with bolting and shotcrete gun is proposed to strengthen the integer high-cutting slope,and the system composed of anchor-cable,lattice beam and fracturing grouting is proposed to strengthen the part high-cutting slope. Related Articles | Metrics

Select

Application of Entropy Weight Decision-Making Method to the Optimal Selection of Landslide Treatment Scheme WANG Bao-liang, CHEN Hong-kai 2008, 27(6): 1112-1114,1130.  Abstract ( )   PDF (272KB) ( )   Aiming at the complexity and the uncertainty of optimal selection of landslide treatment scheme,taking the geological data,execution conditions,engineering economy,environmental influence and etc.synthetic factors fully into consideration,the multi-objective optimal model is constructed.This model forms the judge-array according to various schemes and indexes;furthermore,the entropy is determined by the index value.Then the schemes are lined up according to the degree how close it is with the ideal dot,so the optimal scheme is easy to be selected out.Using this method as well as the multi-scheme optimal selection program worked by VB on the base of the entropy power,it is convenient to make a synthetic evaluation of various schemes.Through the optimization analysis of Kang Jiazui landslide treatment scheme,it is proved that the optimal scheme of landslide treatment based on entropy weight has the strong recognition judgment ability.It is convenient,quantitative,and strict.This method also offers certain reference to other synthetic evaluation work. Related Articles | Metrics

Select

Key Concepts of Traffic Management of Modern Freeway WANG Zhong-ren 2008, 27(6): 1115-1119,1159.  Abstract ( )   PDF (530KB) ( )   Freeway traffic management is a business process,which helps to maximize the productivity of freeway.Its core task is to balance the demand and capacity,prevent traffic congestion,and minimize traffic accidents.Based on a comprehensive review of the theories and practices in the traffic management of modern freeway,it is concluded that a successful freeway traffic management program has to incorporate the following three core concepts,i.e. (1) the concept of information-driven and performance-based management; (2) the concept of system management;and (3) the concept of proactive system management.Information-driven and performance-based management serves as the basis of such a successful program,while system management as the primary strategies,and the proactive management as the ultimate goal.These three concepts constitute the key concepts of modern freeway management.As a necessary prerequisite to manage freeway well,these three key concepts provide the fundamental guidance to the manager,who will propose the feasible management strategies fitting with the practical situation.It is hoped that discussions of these key concepts will help to enhance freeway management practice,improve freeway operation efficiency and freeway traffic safety. Related Articles | Metrics

Select

Traffic Policy of P&R in England and Its Significance as Reference HUI Ying, YANG Fei 2008, 27(6): 1120-1123,1172.  Abstract ( )   PDF (409KB) ( )   Taking the development of P&R (Park & Ride) traffic policy in England as an example,its implement effect is analyzed and summarized in terms of transport,land utilization,environment,business development,society problem and etc.Combining with the setting of 37 P&R hinges in Shanghai synthetic passenger transport plan,the significance of England as a reference to develop Shanghai P&R are discussed. Related Articles | Metrics

Select

Analysis on Designing Parking Lots under City Viaducts and Its Traffic Impact LI Shao-shuai, PAN Xiao-dong, JIANG Hong, YANG Zhen 2008, 27(6): 1124-1126.  Abstract ( )   PDF (229KB) ( )   With the rapid growth of the number of motor vehicles,the problem of "difficult parking" in cities has deteriorated.Based on the analysis on the optimal use of the space under the city viaducts,the setting conditions,the method of traffic impact analysis and the traffic organization scheme of parking lots under the city viaducts are put forward. Related Articles | Metrics

Select

Study on Setting Design of Variable Lane on Typical Tide Traffic Road CHEN Jian, HUO Ya-min 2008, 27(6): 1127-1130.  Abstract ( )   PDF (302KB) ( )   Through the survey on the traffic condition of Shuxi Road in Chengdu and the analysis of its traffic flow,service level and other traffic characteristics,the feasibility of setting up variable lane on the basis of the relevant requirements is demonstrated.The specific design program of variable lane is proposed to ease traffic congestion in the morning and evening peak on Shuxi Road.At the meantime,its implement effect is tested by road traffic simulation. Related Articles | Metrics

Select

Analysis on Some Issues of Chongqing Transportation Development in Balancing Urban and Rural Project HU Xing-hua, TANG Re-qing, HAN Dong-fang 2008, 27(6): 1131-1134,1167.  Abstract ( )   PDF (410KB) ( )   Traffic is an important supporting system to balance urban and rural development.In terms of the idea,the framework of transport development strategy is built to balance urban and rural development,and its supporting points of the development strategy are discussed.Therefore,the transport development priorities in the system of balancing urban and rural development are ensured.According to the analysis of tertiary industries and the transportation development mode,the basic thought and strategic emphasis of transportation development in balancing urban and rural development of Chongqing are proposed.It brings out the basic idea that the countryside and rural integrated system is comprehensively driven by the urban tertiary industries through the transportation system both from inside and outside systems. Related Articles | Metrics

Select

The Research on Synthetic Evaluation of Traffic Safety of Freight Corporation SHI Yong 2008, 27(6): 1135-1138.  Abstract ( )   PDF (263KB) ( )   The principles of establishing the traffic safety evaluation index of freight corporation are introduced.The weight of all indexes is determined through AHP method.Then the traffic safety evaluation mode is established under the guide of fuzzy evaluation theory.The application of this mode is helpful to improve the traffic safety. Related Articles | Metrics

Select

Simulation Research of the Optimization of Power Transmission of CNG Vehicle Based on CRUISE WEN Xiao-xia, DU Zi-xue, DONG Ying-Jun 2008, 27(6): 1139-1141,1159.  Abstract ( )   PDF (330KB) ( )   In order to enhance the dynamic performance of the CNG bus effectively without big design change of the engine,it is proposed to improve the reasonable matching of power transmission system of CNG bus.The model of CNG bus is established by making use of the advanced simulation software CRUISE;the matching analysis and computation of CNG engine and 3 transmission systems are carried out,and the simulation computation of dynamic performance are also performed.Through matching computation,the optimization combination can be selected out quickly from a large number of optional schemes,and it can be guidance to the design and development of CNG buses. Related Articles | Metrics

Select

A Novel Method of Vehicle Classification Based on Image Identification DENG Tian-min, YU Yong, SHAO Yi-ming 2008, 27(6): 1142-1145.  Abstract ( )   PDF (339KB) ( )   A new approach is proposed to detect and classify the moving vehicle in static scenes,which is based on GVF-Snake model and inertia ellipse.The vehicles contour is extracted from successive traffic-frames by Gaussian Mixture Model,Expectation Maximization estimate algorithm and improved GVF-Snake model.The ellipse eccentricity of the moving vehicle is computed from the principal of inertia ellipse of rigid body.The vehicle classifier is established on the base of three parameters,which are the length of vehicle,the projection area of the vehicle and the equivalent ellipse eccentricity.As the method is based on the principles of statistics,it is quite simple and it can be easily programmed.This method is fit to be applied into the embed system. Related Articles | Metrics

Select

Impact Study of Sediment Deposition on Chongqing River Reach after Running the Three Gorges Reservoir QIU Xi, YIN Chong-qing 2008, 27(6): 1146-1150.  Abstract ( )   PDF (377KB) ( )   After the Three Georges Reservoir running according to 175m scheme,it is showed that the deposits will increase accumulatively with the TGR running in the downtown reach,the river bar will be widen and heighten.At the same time,the movement of bed evolution will be acute.The sediment aggregation will bring out certain negative influence on harbor,navigation,the infrastructures and eco-environment along both banks of the reach of Chongqing.Taking various aspects of research achievements into consideration,the main engineering measurements are put forward in order to decrease the influence,such as reinforcing soil conservation,building reservoirs at upstream to prevent sand sedimentation,narrowing the flow to wash sand,implementing bank regulation,harbor reconstruction and navigable channel treatment etc.These measures will be very effective on decreasing deposition and eliminating the negative effects. Related Articles | Metrics

Select

Design of Booster Humidification Devices for Marine Diesel Engine MA Zhao-sheng 2008, 27(6): 1151-1154.  Abstract ( )   PDF (256KB) ( )   The hardware and software of humidifying equipment have been designed for ship compressor on the base of ultrasonic and Atmel89C51,and intelligent control of humidifying equipment has been also achieved.The system can be operated by manual and automatic control method.The number of working vibration generator and their orientation can be controlled by relay,and this control method can optimize flow field of air inflow and satisfy the actual needs of the marine diesel engine well. Related Articles | Metrics

Select

The Design of the Organic Solid Wastes Compost Equipment YANG Yan-mei 2008, 27(6): 1155-1159.  Abstract ( )   PDF (367KB) ( )   There are few commercialized compost reactors and some applied reactors have many problems,that is,reacting materials mix unevenly and waste materials is easy to produce odor during the compost process.Therefore,an organic solid wastes compost equipment with mixed oar and layer of adsorption is designed.The main material of this equipment is made of organic glass or stainless steel,which can contain 100 L waste material.And this equipment contains insulating layer,air collecting layer,filler layer of adsorption,aixs of rotation,intaking buffer layer,mixed oar,intake duct,drainage duct,material outflowing,air outlet,moving top cover and the compost warehouse formed by the space held in the inner wall of insulating layer.When composting the kitchen wastes,the average ventilation rate should be 68.19 m3/d,the maximum range of gas flowmeter rate 0.15 m3/min,the air volume provided by the fan 8.4 m3/h,and the total pressure 2×103 Pa,the diameter of agitating shaft of reactor 30 mm,the shaft diameter of output shaft of transmission 15mm,the external diameter 25 cm,the effective height of agitating shaft 57 cm,the motor rated power of mixing equipment 3.0 kW.This equipment has these potential advantages,such as mixing reacting materials evenly and being free of odor. Related Articles | Metrics

Select

Analysis on Early-Warning System of Natural Gas with Hierarchy CHI Jie, REN Hao 2008, 27(6): 1160-1163.  Abstract ( )   PDF (287KB) ( )   Natural gas is a kind of indispensable energy for economy development.To ensure the balance of demand and supply of nature gas at a certain cost,it's necessary to introduce early-warning system of nature gas.How to use hierarchy analysis to dispose early-warning problem of nature gas is discussed.That means,both total and short-term indexes with hierarchy methods are analyzed respectively,and then the total index is used to revise the short-term one,providing early-warning to system. Related Articles | Metrics

Select

Comprehensive Evaluation Study on the Reliability of Member Enterprise of Supply Chain Based on Grey Theory TAN Xiao-yong, ZHU Xin-liang 2008, 27(6): 1164-1167.  Abstract ( )   PDF (251KB) ( )   Reliability evaluation index system on member enterprise of supply chain is introduced.A scientific and perfect calculation model of the reliability evaluation on member enterprise of supply chain is established based on grey system theory.Its feasibility and worthiness of application are tested by the example. Related Articles | Metrics

Select

Positive Integral Solutions of Diophantine Equation of Continuous Positive Integers ZOU Zhao-nan 2008, 27(6): 1168-1172.  Abstract ( )   PDF (346KB) ( )   The positive integral solutions of the Diophantine equation of continuous positive integers xn+(x+1)n+…+(x+h)n=(x+h+1)n are still unsettled until now.The latest result known at the present can be described as following: ①If 6≤n≤33;②If n>3 and n is an even integer;③If 34≤n≤200,the equation mentioned above has no positive integer solutions.Variety of sieve methods of prime modulus are adopted and it is proved that the Diophantine equation has no positive integer solutions when n is an even integer fitting with the condition 200<n≤250.The current conclusion has been improved and promoted by this result. Related Articles | Metrics