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15 December 2007, Volume 26 Issue 6 Previous Issue    Next Issue

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Nonlinear Torsion Analysis of Composite Thin Walled Bar WU Zu-lie,ZHAO Fen,CHANG Guo-qiang 2007, 26(6): 1-6.  Abstract ( )   PDF (221KB) ( )   Taking the effects of geometrical nonlinearity into account，a general theory of composite thin walled bar is established under the combinational deformation of tension，compression and torsion.Focusing on the nonlinear torsion ana1ysis of composite thin walled bar，based on the principle of minimum potential energy，the governing equations of equilibrium as well as all boundary conditions concerned are deduced from the equivalent constitutive equations and general potential energy function.In addition，a solution to the equations of equilibrium is discussed. References | Related Articles | Metrics

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Study on Creep Effect of Eccentrically Compressed CFST Members YU Wu-jun,GU An-bang,CHEN Yu-feng,LI Bo 2007, 26(6): 7-9.  Abstract ( )   PDF (168KB) ( )   The creep-shrinkage effect of CFST is different from that of reinforced concrete because of its containment，stiff consistency and not casting water during curing period as well as its unloading.The stress recontribution of CFST is significant and must not be ignored.In order to calculate the redistributed stress effectively，according to the elastic creep theory and the principle of superposition，one general formula of analytical model for CFST creep function has been suggested based on the theory analysis on the creep-shrinkage effect of axis compression component[1].One creep model and one compensation model were made.The strain tests results met the theory analysis，and proved the formula. References | Related Articles | Metrics

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Model Construction and Contrast Analysis of Concrete-Filled Steel Tubular Arch Bridge SUI Yan-chun,XIAO Sheng-xie,LI Fang,GUO Xiang-ming 2007, 26(6): 10-14.  Abstract ( )   PDF (237KB) ( )   Haikou Bridge is a concrete-filled steel tubular arch bridge with a main span of 150m.Taking that bridge as an example， based on the software ANSYS，two kinds of spatial finite element models for the bridge were respectively established， under the consideration of the pier bases concretion and the interaction between the soil and the pile.Calculation analyses results of natural vibration of the two models are comparatively analyzed.The establishment method of the two models of the half-through concrete—filled steel tubular arch bridge is provided，which can be reference for relative research. References | Related Articles | Metrics

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Limit Bending Moment Analysis of CFST Member of Circular Section LIU Xiao-yu,LIU Dong-sheng 2007, 26(6): 15-17.  Abstract ( )   PDF (159KB) ( )   Two efects of confinement which result from the interaction between steel tube and concrete under ultimate limit bending states are analyzed.In addition，the calculation method of zero line position is deduced as well as the computational formula of limit bending moment under ideal elasto plasticity states. References | Related Articles | Metrics

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Analysis of Shear Lag in Trapezia Thin-Walled Box Beams witIl Constant Cross Section CHANG Guo-qiang,WU Zu-lie,ZHAO Fen,GUAN Yan-wu 2007, 26(6): 18-23.  Abstract ( )   PDF (225KB) ( )   Cosine functions are supposed to simulate the longitudinal displacement of thin·walled box beams when bended. The differential equations of Trapezia thin-walled box beams with constant section are derived on the basis of generalized variational principle，and the solutions of simply supported box girders subjected to vertical concentrated load and vertical uniform pressure load are obtained .The example shows that this method matches cubic·parabola—function method. References | Related Articles | Metrics

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Theoretic and Experimental Research on Loading Characteristics of Cantilever Beam in Composite Structure LI Li-feng,SHAO Xu-dong 2007, 26(6): 24-28.  Abstract ( )   PDF (282KB) ( )   Hongshan Bridge which locates in Changsha City，is a harp style cable-stayed bridge with inclined pylon and without any back-stays.The main span is 206 m long.The main girder is a spine girder，and the bilateral girders are of 13-meter-long steel-concrete composite cantilever stucture，with the longitudinal space of 4 m.The theories of loading distribution along crosswise were analyzed by adopting the modified articulated beam，The calculating formulas were deduced，and a model test was performed to prove the correction of these formulas.Finally，adding ballast weight of 320 kN on the edge of cantilever beam was adviced to solve the crack problem of negative moment zone.The crack width of concrete deck Was analyzed by taking creep and shrinkage of concrete into account and comparing kinds of various specification.The above-mentioned results provide strong basis for the design of bridge deck. References | Related Articles | Metrics

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Wind-Excited Flutter Analysis of Cable-Stayed Bridge with Long Span of Pengxi River LI Xi,TU Zhong-ren, GU An-bang 2007, 26(6): 29-32.  Abstract ( )   PDF (265KB) ( )   Focusing on the sensitivity of wind load action on cable·stayed bridge，investigated the mechanism and analytical method of wind-excited flutter.On the basis of that，taking the Pengxi river cable-stayed bridge with long span as an example，a proper dynamic calculation model Was established by using the professional software of MIDAS and with geometric nonlinear consideration.According to the dynamic behavior at both construction and completion stage，the wind-resistant behavior of the bridge was evaluated.These results provide reference for the design of wind-resistant and the analysis of dynamic stability. References | Related Articles | Metrics

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Evaluation for Cable-Stayed Bridges Stability Based on Fuzzy Theory and AHP HE Li-li,XIAO Sheng-xie,ZANG Deng-ke 2007, 26(6): 33-37.  Abstract ( )   PDF (233KB) ( )   If the stability of cable-stayed bridges are analyzed by means of a numerical procedure，it is difficult to analyze all the factors synthetically，the calculational method is complicated and workload is great.Based on the fuzzy theory，the research on stability of cable-stayed bridges are carried out by the multi-grade fuzzy synthetic judge.Considering factors about stability，the evaluation matrixes of single factor are established，then，the proportions of all kinds of factors are determined by comprehensive application to AHP and the experts evaluating method。the procedure of evaluation is quantitated preferably.At last，the result of evaluation for the cable-stayed bridges stability is drawn through the model of the multi-grade fuzzy synthesis judge.Consequently，whether the stability of cable-stayed bridges is satisfying is known . References | Related Articles | Metrics

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Analysis of Cracks Generating in the Course of Laying Aside Pre-Cast Beam ZAI Guo-jun,ZHOU Zhi-xiang 2007, 26(6): 38-42.  Abstract ( )   PDF (232KB) ( )   Aiming at the problem that pre-cast beam generated cracks in course of laying aside it，the mechanics knowledge Was utilized to deduce the formula，and the tensile stress under different descending value of temperature Was calculated according to the engineering，and the finite element software ANSYS Was used to verify the formula.The conclusion Was put forward that if the bearings of pre-cast beam were incorrectly installed when it Was laid aside，and the sudden descending of temperature may result in cracks ，then the corresponding avoidance measure was suggested . References | Related Articles | Metrics

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Mechanism and Precautionary Measures for Cracking of Pre-Stressed Concrete Continuous Box Girder of Continuous and Rigid Frame Bridges in Service Phase CHEN Yu-feng,LUO Ling,WANG Wei-hong,WANG Yun-tao,XU Jun-Lan 2007, 26(6): 43-45.  Abstract ( )   PDF (212KB) ( )   Based on the cracking investigation，some inclined cracks in webs apprearing in the continuous prestressed concrete box girder bridge in service phase are analyzed.Main factors inducing cracks are considered.such as temperature gradient，vehicular load，principal tensile stress of concrete，fatigue under temperature load and vehicular load.Proper temperature gradient should be selected in design phase to avoid crack.Some anti-rust coatings Can be daubed on the surface of the steel strands to protect them from corrosion by cavity seepage.Webs of box girder from one quarter to three quarters of each span may be poured with steel fiber reinforced concrete to avoid fatigue effect. References | Related Articles | Metrics

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Reason Analysis and Countermeasures for Excessive Deflection of Midspan in Long-Span Continuous Rigid Frame Bridges QI Dong-chun,ZHANG Yong-shui,LI Qiang 2007, 26(6): 46-49.  Abstract ( )   PDF (214KB) ( )   The excessive deflection in the midspan is one of the main faults in long-span continuous rigid frame bridges.This paper make a comprehensive analysis for the causes of the excessive deflection and find out the countermeasures for this problem. References | Related Articles | Metrics

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Calculation and Analysis of Lateral Displacement at the Top of Higher Bridge Pier MA Zhao-xia,CHEN Si-tian,GONG Shang-long 2007, 26(6): 50-54.  Abstract ( )   PDF (198KB) ( )   Using the energy method ，the lateral displacement at the top of the higher bridge pier is calculated and analyzed on the consideration of elastic restrictions of the rubber plate supports and elastic deformation effects of the foundation.The results of the example indicate that the effects of elastic restrictions of supports and the elastic deform action effects of the foundation should not be neglected. References | Related Articles | Metrics

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Application Technique of U-Shape Structure to Wet Soft Soil Foundation LIANG Xiong,ZHOU Jian-ting,YANG Sheng-chao 2007, 26(6): 55-59.  Abstract ( )   PDF (225KB) ( )   Based on application of U-shape structure automobile passage，which is in Foshan City of Guangdong Province，to wet soft soil foundation，the structure construction and the methods of the soft soil foundation processing of the U-shape are introduced，and the main point about design of the engineering watertightness and drain is given.The calculation model of the U-shape structure in wet soft soil foundation is disacssed and the mechanics characteristics and deformation characteristics of that U-shape structure are analyzed when there is no anti-pulling out pile.Practice proves that the U-shape structure for coastland wet soft soil foundation is applicable，safe，economical and worthy of extending. References | Related Articles | Metrics

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Analysis of High Speed Driving Comfort Impacted by Deflection upwards of PC Bridges WANG Xu-jun,ZHONG Ming-quan,LIU Jian-bo,ZHAO Fen 2007, 26(6): 60-63.  Abstract ( )   PDF (239KB) ( )   The problem of the defection upwards of PC bridge appears frequently，and it is disadvantageous to the driving comfort.Based on the 1/4 models of motorcar.the mode1 of simple supported beam was used with constant moving load to simulate bridge vibration and the half sine curve was used to simulate the bridge floor longitudinal curve when bridge upwards formed.Two response equations of motorcar vibration are established，which are caused by bridge vibration as well as deflection upwards.Further more.these two influences on motorcar vibration arc analysed and compared in detail.A conclusion that the influence of bridge vibration to the motorcar vibration iS trivial compared with that of deflection is drawn. References | Related Articles | Metrics

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Application of SPSS to Arch Bridge Curve Transformation Observation Regress XU Xi,ZHANG Yi 2007, 26(6): 64-66.  Abstract ( )   PDF (157KB) ( )   According to analysis actual observation data about bridge cove axes，the design linetype of bridge cove axes was fitted to design other parameters and academic data through SPSS soft，It makes the construction curve regression，distortion analysis and precision assess more disciplinarian ，easier and more efficient.It provides full，accurate and credible gist for reinforcing，repairing old building，and evaluating new buildings’construction quality， References | Related Articles | Metrics

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Current Research State of Face Stability in Shield Tunnelling and Future Development WEI Liang-wen,ZHANG Qing-he,SUN Tong-1i,WU Min-hui 2007, 26(6): 67-72.  Abstract ( )   PDF (311KB) ( )   The face instability of the shield tunnels call cause excessive surface settlement under complicated geological conditions，which may destroy the surface building and various underground pipes.The theoretical current research state of the face stability of shield tunnel is discussed with microcosmic instability mechanics model，plastic limit mechanics model and wedge and silo mode1.The emphases of future research in this field ale particularized，which include coupling of soil and underground water，variation of the face stratum，effect of construction parameters on face stability and slurry pressure controlling when leaving and arriving shaft.The available research directions are put forward for the future research on face stability of shield tunnel and guiding the field practice. References | Related Articles | Metrics

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Research on Detection and Reinforcement Measures for Lies Concealed Karst in Bottom of Tunnel YANG Dun-guo,LI Min 2007, 26(6): 73-76.  Abstract ( )   PDF (221KB) ( )   The tunnel with large section of the 16th Section in YI WAN Railway is in the special geological conditions．including joinfing fissure developing abnormally，dissolution being very seriously，the rock mass cmshing and many place having abnormity fissure，and 80 on．To minfome and treatment these，the special groutings to fissure，solution groove and some place of berak were advised．At last，assessed by samplings，this carrying capacity in fundus reached the design request，and efectivdy defensed the gushing water，the sudden mud-rock strike-dip moderating production proem and the hidden trouble of safety． References | Related Articles | Metrics

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Research on Horizontal and Vertical Control Index of Building Park's Tunnel PAN Xiao-dong,ZHAN Jia,TENG Sheng-qiang 2007, 26(6): 77-79.  Abstract ( )   PDF (173KB) ( )   With the city basic building development and the instant increasing of motor vehicles，there are higher request for building parks，SO the control indexes for park constructing were constictuted according to each city own characteristic．The authors did more particular research for the issues of the park control indexes，brought forward the new concepts of dynamic headroom and put forward the calculation method of the headroom an d suggested a control value for curve width，in order to improve the safe of driving in the park． References | Related Articles | Metrics

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Study on Settlement Prediction of Highway Based on Gray-System LIU Li-feng,JIANG De-yi,WANG Qing-zhen,TIAN Jing,LI lin 2007, 26(6): 80-81.  Abstract ( )   PDF (141KB) ( )   A forecast model of settlement prediction of highway is established based on the sequence forecast theory of gray system，and the precision of the forecast model is analyzed by using factual data in pmject.By comparing the forecast data and original data，the rationality of the forecast result is shown．At last the characteristics and$ome problems in application of the forecast mod el are discussed. References | Related Articles | Metrics

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Mechanics Model Analysis of Joint after Overlaying Asphalt on old Concrete Pavement LUO Xiao-hui,DONG Jun,LIU Hai-liang 2007, 26(6): 82-86.  Abstract ( )   PDF (246KB) ( )   Aiming at a series of mechanics problem on overlaying asphalt on the old cement concrete pavement，mechanics model and numerical analysis method were adopted to explode and research. Fortrango language was applied to computing the procedure for dimension，and an example analysis Was given．All the results of the computing were consistent with the Ansys software imitating results and the local test results．The model is proved to be reasonable in theory and has important and actual meaning for future investigation on asphalt overlay． References | Related Articles | Metrics

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Stability Analysis of Part-Cut and Part-Fill Subgrade under Static and Dynamic Loading JIANG Xin,QIU Yan-jun,LING Jian-ming 2007, 26(6): 87-91.  Abstract ( )   PDF (256KB) ( )   Stability analysis of part-cut and part-fiU subgrade has been a great concern for hi．ghway engineers.Based on the strength reduction method(SRM)，a commercial software named FLAC/SLOPE was conducted to analyze the slide behavior of part-cut part-fill subgrade；at the same time，FLAC3D，a geotechnical cod e based on three dimensional fast lagrangian analysis of continua Was conducted to analyze the dynamic behavior of part-cut part-fill subgrade under the earthquake dynamic loading．So me design-construction comments were provided based on the results of numerical simulation． References | Related Articles | Metrics

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Research on Reclaimed Asphalt Pavement Mixtures Based on Superpave ZHOU Zhi-jian,XIAO Fei-peng 2007, 26(6): 92-95.  Abstract ( )   PDF (249KB) ( )   Recycling of reclaimed asphalt pavement(RAP)，as a kind of new material technique methods，is being used broadly in hot mixture asphalt(HMA)to save money and protect the environment.However，the use discipline of these materials is not clear in the Superpave mix design system.It is necessary to un derstand whether the RAP can be used in Superpave mix design procedure.The test results show that the recycling of RAP is reasonable and feasible in Superpave system.The use of RAP can significantly decrease the content of new asphalt and increase the indirect tensile strength of the mixture in the Superpave mix design.At the same time，the additional RAP also play a key role in enhancing the rutting resistance，increasing the indirect resilient modulus and improving the stiffness of these mixtures. References | Related Articles | Metrics

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Effects of Confining Pressure on Dynamic Modulus ZHAO Yan-qing,YE Qin,WEN Jian 2007, 26(6): 96-99.  Abstract ( )   PDF (160KB) ( )   The effects of confining pressure on mechanical properties of asphalt mixtures are important since the asphalt mixtures in pavement structure behave in a three dimensional stress state.Triaxial dynamic modulus tests were conducted at various temperatures，confi ning pressure levels and frequencies for a Superpave20 mixture with a modified binder and a Superpave25 mixture with a neat binder.The results were analyzed to study the effects of confining pressure on dynamic modulus at various conditions.The analysis results show that the effects of confining pressure on dynamic modulus become more evident as temperature increases and loading frequency decreases.At 55℃ the dynamic moduli obtained at a confining pressure of 250 kPa could be 4.7 and 18 times as high as the values obtained without confining pressure for Superpave 20 and Superpave25，respectively.This study shows that it is important to take the effects of confining pressure into account in pavement structure analysis. References | Related Articles | Metrics

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Effects of Temperature Segregation on Asphalt Pavement Performance ZHENG Xiao-guang,CONG Lin,GUO Zhong-yin 2007, 26(6): 100-104.  Abstract ( )   PDF (275KB) ( )   By site and laboratory tests，regularity of temperature variation and the relationship between temperature and density(air void)were analyzed．The results indicate that temperature segregation usually occurs during the construction，and temperature segregation can cause isolated areas of low density and large air void which may result in reduced fatigue life and moisture damage；the infrared thermograph and penetration thermometer can map the thermal characteristics of the entire mat surface，and the technology call be used during construction，which would enable the contractor to remedy problems immediately once they occur. References | Related Articles | Metrics

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Influences of Diferent Grading on Mixture Performance of OGFC HUANG Gang,HE Zhao-yi 2007, 26(6): 105-109.  Abstract ( )   PDF (218KB) ( )   Different grading not only decide structure of asphalt mixtures，but also influence their performance.Taking the gradation limit of OGFC-13 as a study object，the grading trend of whole OGFC were studied and tested by selected typical gradations.The influences of difference grading trend were analyzed quantificationally by studying mixture techno-parameters and indexes of pavement perform ance.Th en the reasonable gradation limit which may satisfy the requirement of OGFC mixture is put forward. References | Related Articles | Metrics

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Study on Testing Performance of Fiber-Reinforced Asphalt Mixture MENG Yan,MEI Ying-Jun,LI Zhi-Yong,LU Yue-fei 2007, 26(6): 110-114.  Abstract ( )   PDF (248KB) ( )   Mixing the polyester fibers，polyacrylonitrile fibers and methyl cellulose respectively into three different gradation types asphalt mixtures：AC，SMA and OGFC，the fiber-reinforced asphalt mixtures were formed.Based on the performances tests of the fiber-reinforced asphalt mixtures，such as Marshall stability，high temperature rutting，low temperature crack resistance，water stability，skid resistance etc。the strength-mechanism of the fiber-reinforced asphalt mixtures was analysed .Contrasting with the testing data of common asphalt mixtures，all the three kinds of fiber-reinforced asphalt mixtures performances have improved,and the improvement of polyester and polyacrylonitrile fibers is greater than that of methyl cellulose.In accordance with rutting test data，the optimal designed content of fiber is presented in different traffic.Due to marked economic benefit brought by the fiber-reinforced asphalt mixtures-increasing road life and reducing maintenance costs，it would be applied comprehensively and developed quickly. References | Related Articles | Metrics

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Test Method Research on Elastic Modulus of Sand-Gravel Material CHEN Wen-jie,LIANG Nai-xing 2007, 26(6): 115-118.  Abstract ( )   PDF (241KB) ( )   For the big dimension of sand-gravel，the test method of elastic modulus in test methods of soils for highway engineering cann’t be applied to sand-grave1.This paper improves the test method of elastic modulus of sand-gravel，and the test result Can be more closer to the fact. References | Related Articles | Metrics

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Fractal Dimension and Forecasting of Trafic Flow for Freeway Based on Phase Space Reconstruction LI Jian-zhang,ZHU Shun-ying 2007, 26(6): 119-122.  Abstract ( )   PDF (197KB) ( )   By calculating the Hurst Index of the short time traffic flow in variant time scales for freeway，a fractal dimension was put forward.It showed that the interval time of traffic flow was shorter，the fractal dimension was bigger，and the structure was more complex.So it is m0re difficult to forecast.We present a new forecasting method—moving average nearest neighborhood forecasting method，which is based on the phase space reconstruction and combining with the moving average forecasting and the nearest neighborhood method.The efficiency of the method Was proved by theory and actual traffic flow. References | Related Articles | Metrics

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Method of Signal Comparison Used to Judge Arriving Time for Reflected Wave XU Nian-chun,SHI Dong-hong,ZHANG Qiu 2007, 26(6): 123-126.  Abstract ( )   PDF (188KB) ( )   If the upper rock is considered homogeneity，the vibration signals tested on equal-offset spots is theoretically same in ground wave test.When the wave reflected by the joint reaches one spot firstly，the vibration signal on this spot will depart from others.So we can judge the initial arriving moment for reflected wave through signal comparison.This method was used to signals tested in one experiment indoors，and the initial arriving moment was close to the theoretic value. References | Related Articles | Metrics

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Verification of Movable Bed Model of Broad-Shallow Shifting Reach in Sinkiang Region： Taking the Model of Hutubi River for Example YANG Sheng-fa,HU Jiang,JIN Wei 2007, 26(6): 127-132.  Abstract ( )   PDF (293KB) ( )   Taking the model of Hutubi River for example.the problems of verification of the serf-simulation movable bed model，such as the model san d，the model inlet controlling and the verification standard，were studied.By the verification of water level，the shifting range an d the Scour depth of the type section，the result of the model was consistent with that of the archetype fiver.The movable bed model design of Hutubi river is feasible.and can be the reference for the movable bed model design of the broad-shallow shifting reach in Sinkiang region. References | Related Articles | Metrics

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Preliminary Study on Efect of Training Work at the Head of the Tianxingzhou Bar XU Fang,YUE Hong-yan,DENG Jin-yun 2007, 26(6): 133-136.  Abstract ( )   PDF (217KB) ( )   The training work at the head of the Tianxing Bar in Wuhan reach has been applied to prevent the head and right edge of the bar from the continuous bankfailure，and to retain the stability of the river regime and navigation condition of the braided channe1. Based on the an alysis on the recent river evolution and prediction on the trend of riverbed erosion and deposition after the construction of the Th ree Gorges Reservoir，the efect of the training work is analysized. References | Related Articles | Metrics

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Modal Analysis of Container Wharf Bridge Crane Structural Property TIAN Jian-zhu,WANG Duo-yin,ZHOU Shi-liang 2007, 26(6): 137-140.  Abstract ( )   PDF (163KB) ( )   Vibration is a problem that the construct can’t avoid，SO handling the knowledge of the dynamic characteristics such as natural frequency and quake pattern.Can make US avoid the loss that results from resonance.The modal analysis is made to ascertain the dynamic characteristics，and to get the natural frequency and vibration pattern.Based on the accurate medal analysis of complex system structure，vibration diagnostic program and refimng the dynamic characteristics can be performed.Finite.element method is used to analyze the med al of Guanlei Wharf Bridge crane structure and ten modals have been abstracted .From these medals.critical medals are found out and their influences on the structure are illustrated.Considering the actual conditions，the self-vibration security estimation is given under the basic work condition. References | Related Articles | Metrics

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Water Quantity and Quality Integrated Evaluation for Water Resources to the Jian River Basin WANG Miao-lin,PU Shu-hong,FU Hua 2007, 26(6): 141-144.  Abstract ( )   PDF (209KB) ( )   Along with the social and economic development in China，the problem of water resources and environment become more and more serious.In order to understand distribution of different water quality classes related to a certainty water quantity and their changes，it is necessary to develop a comprehensive integrated assessment approach of water quantity and quality.The Jian River basin Was selected as a case study，an d two methods of surface water quantity and quality integrated evaluation and related results were given.Finally the method Was discussed about their suitability. References | Related Articles | Metrics

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Application of Grey Models to Prediction of Transport Quantity Passing a Dam LI Wei-wei,ZHA0 Jian 2007, 26(6): 145-147.  Abstract ( )   PDF (142KB) ( )   Based on grey models GM(1，1)，the prediction model of transport quantity passing a dam is established.The practical implementation of the model Was accomplished by a case study in prediction of transport quantity passing the lock of the Wujiang River Yinpan Dam.Results show that the model based on grey models is feasible and has higher reliability、 References | Related Articles | Metrics

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Passenger Transport Manage Strategies of Expressway between Chengdu and Chongqing TANG Re-qing,HUANG Wei-hong,GUO Liang-jiu 2007, 26(6): 148-152.  Abstract ( )   PDF (295KB) ( )   As two big cities in the southwest of our country，Chongqing and Chengdu connect with each other tightly in economy.For long，the passenger transportation between the two cities has been shared by highway，railway and aviation，and the competition among them is very furious.The operation of Suining-Chongqing High Speed Railway makes the competition more serious，and the advantages of“safety，comfort，economy”of railway have brought great pressure to expressway and ariation.The history of the passenger transportation competition among the three transportation modes is reviewed，an d the future competitive situation of these modes between the two cities is analyzed，and the strategic transfer of highway passenger transportation under the competitive condition is studied using SWOT analysis，and 6 corresponding defensive competitive strategies ale put forward. References | Related Articles | Metrics

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Finite Element Analysis of QY16 Autocrane's Slewing Table ZHU Fu-gen 2007, 26(6): 153-155.  Abstract ( )   PDF (139KB) ( )   According to the loads situation of QY16 autocrane’s slewing table in work，a load mathematics model WaS built.The rigidity and intensity of QY16 autocrane’s slewing table under three typical load cases were analyzed with finicte element analysis.The design of slewing table Can meet the engineering standard which has been proved through analyzing the worst load csse.According to the work conditions of engineering.some methods to improve the design of slewing table are proposed. References | Related Articles | Metrics

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Self-Diagnosis Design for Automotive Electronic Control System CHEN Feng,DING Yang-yan,HUANG Jian 2007, 26(6): 156-161.  Abstract ( )   PDF (256KB) ( )   Aiming at some problems in the self-diagnosis design of the automotive electronic control system，the self-diagnosis designing method and technique of sensors，actuators，ECU(Electronic Control Unit)，which are the thee main parts of the automotive electronic control system，fire discussed.It can be valuable reference for consummating the function and enhancing the performance of the automotive electronic control system and it also can offer some designing thoughts to the designers dedicated to the control system. References | Related Articles | Metrics

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Study on Distortion Detective Method for Chaotic Time Series Based on Neural Network WANG Xing-jia,WANG Xiao-hui,ZHA0 Chao 2007, 26(6): 162-165.  Abstract ( )   PDF (181KB) ( )   The method of chaos identifying for time series is introduced．By virtue of the predictability of chaotic time series，the distortion detective method for chaotic time series based on neural network is presented．Th e practical example demonstrate that the distortion data of chaotic time series can be detected and recovered correctly by this kind of method．The method is not only a detective process but also a recovering process，and the application prospect in the field of data processing is optimistic． References | Related Articles | Metrics