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15 June 2003, Volume 22 Issue 2 Previous Issue    Next Issue

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Advancing and reviewing of research on aerodynamic admittance of bridges JIN Xin-hua，XIANG Hai-fan，CHEN Ai-rong 2003, 22(2): 1-5.  Abstract ( )   PDF (175KB) ( )   Aerodynamic admittance was an important aerodynamic factor in analysis of buffeting of bridges. It was nearly no research in China.Based on the summarization of reports of research on aerodynamic admittance, source, research history and formula of aerodynamic admittance were systemically introduced. Meanwhile, new achievements and more work about aerodynamic admittance research are introduced, which have very important significance for reference to further research. References | Related Articles | Metrics

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Determining of non-strain state of flexible suspension bridge WEI Jian-dong，LIU Shan-hong，QIAN Yong-jiu 2003, 22(2): 6-9.  Abstract ( )   PDF (480KB) ( )   In order to evaluate the carrying capacity of one flexible suspension bridge, the authors measured its shape under no load and took a static test under traffic load. Non-linear FEM was used to model the behavior of the structure. It was focused on the method to determine the non-strain state of structure using the measured results. The consistenly of simulated results with the test confirms the correctness of themethod. The method, proposed in this paper to determine the non-strain state of structure, can be used to design and analysis large-span cable structures. References | Related Articles | Metrics

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Closure scheme design of Masangxi Yangtze River Bridge in Chongqing YU Lu，WANG Yi-bo 2003, 22(2): 10-14.  Abstract ( )   PDF (591KB) ( )   Masangxi Bridge is a floating cable-stayed bridge with double-tower and double cable planes, whose main span is 360m. The main beam is separated triangle beam of prestressed reinforced concrete, and inverted Y-shape tower is adopted. As an extra-long bridge, the closure of side (center) span touches on the completion and using of bridge in time, and perfect design had been made by designer for preventing contingency.The design idea is introduced in this paper. References | Related Articles | Metrics

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Theory & Win32 software development of design and construction calculation about suspension bridge maim cables TANG Mao-lin，QIANG Shi-zhong，SHEN Riu-li，LI Ping-li 2003, 22(2): 15-19.  Abstract ( )   PDF (185KB) ( )   In this paper , the main cables are simplified to uniform loads along arc direction and concentrated loads at suspension points according to suspension bridge structures. Catenary is the linetype of main cables between slings, and the linetype at a suspension point is decided by equation of equilibrium of forces and equation of compatibility of displacement. So the main cable linetype of suspension bridges is subsection catenary. According to this theory, the reliable accurate method is constituted to calculate construction sequences and linetype after construction, and the software Sgkz2000 based on Win32 is achieved. Calculation theory and method are introduced together with software development process in this paper. References | Related Articles | Metrics

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Study on deformation character of the surrounding rock masses Concerning the influence of karst caves in the bottom of tunnel ZHAO Ming-jie，LIU Xu-hua，AO Jian-hua，WANG Biao 2003, 22(2): 20-23.  Abstract ( )   PDF (218KB) ( )   Based on the excavation of Chaodongyan tunnel, a numerical analysis concerning the influence of karst caves in the bottom of tunnel on stability of the surrounding rock masses is carried out through using the ANSYS software system, and the yield initiation is assumed to occur following Druck-Prager failure criterion.The deformation character of the surrounding rockmass of tunnel was discussed. References | Related Articles | Metrics

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The present and prospect of highway tunnel surrounding rock stability WU Meng-jun，CHEN Zhang-gui，XU Xi-bin，ZHAO Ming-jie 2003, 22(2): 24-28.  Abstract ( )   PDF (624KB) ( )   For the scale and quantity of tunnel are greatly increased, the format and method of study on surrounding rock stability in highway tunnel also become various.This paper expounds the current situetion of theory study and testing study, and analyses the principal development tendency in future study. References | Related Articles | Metrics

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A kind of construction control system of large-span P.C.cable-stayed bridge CHEN Hong，LAN Hai-yan，XIAO Jun-liang 2003, 22(2): 29-32.  Abstract ( )   PDF (156KB) ( )   Based on the theory of construction control, a kind of control system of large-span P.C.cable-stayed bridge is presented, which has been adopted in the construction of large-span P. C. cable-stayed bridge and has been proved applicable and effective.The bridge configuration control and cable forces control can be effectively achieved, which are valuable references for the construction control of P.C.cable-stayed bridge. References | Related Articles | Metrics

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The cantilever construction technique of prestressed continuous rigid frame bridges WEI Deng-chao 2003, 22(2): 33-35.  Abstract ( )   PDF (111KB) ( )   This paper mainly introduces the technological process and technics in the construction of the Bailuhu Bridge , which is located between Xiaojinkou and Lingken on the expressway from Guangzhou to Huizhou.This bridge is to be constructed with cantilever continuous rigid frames and is to span 115 m at large References | Related Articles | Metrics

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Construction control for Bingcaogang Jinshajiang river Bridge RUAN Sheng-huang，CAO Xiao-chuan 2003, 22(2): 36-40.  Abstract ( )   PDF (166KB) ( )   This paper discusses the construction control contents and methods of Bing caogang Jinshajiang Bridge,and the results of the loads test for the bridge is introduced,and some suggestions about construction control are proposed and may be used for new bridge construction References | Related Articles | Metrics

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Application of support tranlation method in construction of Nanchang New Bayi Bridge FANG Shi-huai，HU Jian-hua 2003, 22(2): 41-42.  Abstract ( )   PDF (84KB) ( )   This paper mainly introduces the method by the support translation technology harnessed in constrution of the Nanchang New Bayi Bridge .This method is to be widely applied in construction practice . References | Related Articles | Metrics

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On the characteristics and landscaping of the interchange in city ZHANG Ming，XIANG Jian 2003, 22(2): 43-45.  Abstract ( )   PDF (118KB) ( )   This paper discusses the characteristics of the interchange in city and explores the principles, flowage and some handling methods in landscaping. References | Related Articles | Metrics

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Researches into automatic design of highway construction plan HE Shou-kui 2003, 22(2): 46-49.  Abstract ( )   PDF (153KB) ( )   In this paper, we analyse limitations of construction design plan by handwork in design and construction organization, then we establish the model of highway construction plan, in order to create the construction plan through automatic design or aided design by computer, finally we discuss about techniques, database and expert system, evaluation model and evaluation index of the automatic design. References | Related Articles | Metrics

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Multi-objective decision-making fuzzy optimal selection model in the many alternatives of highway route designing LIU Zhi-jun，XIAO Sheng-xie 2003, 22(2): 50-53.  Abstract ( )   PDF (149KB) ( )   This paper uses the method of fuzzy math, on the basis of constructing a system consisting of comprehensive evaluation elements in AHP method, applies the multi-objective decision-making fuzzy set theory, regards optimal selection as multi-objective decision-making fuzzy optimation problem and establishes fuzzy optimal selection model. References | Related Articles | Metrics

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Mechanical characteristics of grade sand-gravel base course under cyclic loading MEI Ying-jun，LIANG Nai-xing 2003, 22(2): 54-57.  Abstract ( )   PDF (166KB) ( )   According to the dates and wreck samples that were obtained from triaxial test and CBR test, this paper analyses the deformation characteristics of grade sand-gravel base course under cyclic loading .At the same time from the view of energy put out that the deformation of sand-gravel base course can assumed the two fellowing:one is elasticity deformation, the other is similarity elasticity deformation.This ansys is very useful when consider the deformation of sand-gravel base course References | Related Articles | Metrics

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Effect of additives on low active lime-flyash mixture strength LIU Hong-ying，DAI Jing-liang 2003, 22(2): 58-63.  Abstract ( )   PDF (323KB) ( )   As lime-flyash mixture , a kind of semi-rigid base course material used in highway engineering , has usually very low early strength, its application is confined .The paper studies on low active lime-flyash mixture strength properties with different additives at different ages.Through X-ray diffractometer and scan electron microscope tests, the mechanism of low active lime-fly ash mixture strength with additives is studied.The results show that early strength of lime-flyash mixture can be significantly improved with adding Na2SO4 and Na2CO3, late strength of lime-flyash mixture with Na2SO4 is super to Na2CO3 , where as early and late strength of lime-flyash mixture with Portland cement is weak. References | Related Articles | Metrics

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The regulation and mathematical description of machine operation in a typical system of mixing-paving characterized by parallel-paving SUN Gao-lei，GUO Xiao-hong 2003, 22(2): 64-68.  Abstract ( )   PDF (188KB) ( )   In the construction of highway asphalt pavement , a kind of typical machine combination of mechanical construction that one asphalt mixer-station works with two sets of pavers which run together is adopted widely .In this article an attempt is to make a scientific mathematical description of machine operation and build mathematical service-models and economic evaluation-indexes of mixer-station and paver in this machine combination based on their operation regulation References | Related Articles | Metrics

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Optimal resources disposition of the mechanized asphalt concrete pavement construction system(Ⅱ)——Dynamic Optimization of the System LU Yi-zhao，GUO Xiao-hong 2003, 22(2): 69-71.  Abstract ( )   PDF (126KB) ( )   This paper analyzes the factors that influence the operation slate of the mechanized asphalt concrete pavement construction system. By adjusting the systemps internal factors, it puts forward the method and program to optimize the system dynamically under changing construction conditions. References | Related Articles | Metrics

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Current state and structural analysis of abutment in soft clay LUO Guang-fa，LI Li-feng，CHEN Chang-fu，SHAO Xu-dong 2003, 22(2): 72-75.  Abstract ( )   PDF (430KB) ( )   Serious damage has been obscured in two bridges laid in Sanhe Road of Jiangmen City. Through comprehensive inspection of abutment and soil properties, with plane computation, the paper reach the conclusion that completely accords with actual situation, and find causes, also, some advices are provided. References | Related Articles | Metrics

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The experiments of the scour protection for subgrade river side TIAN Wei-ping，LI Hui-ping，MA Xun 2003, 22(2): 76-79.  Abstract ( )   PDF (151KB) ( )   This paper is aimed to the scour toe of the subgrade river side at concave bank, the prtection mechanism、laws and effects of the apron and the spur-dike are studied based on hydrokinetics analysis and experiments. The main effect parameters and the calculation method of the apron protection are raised on the basis of the model test and the spot observation. Meanwhile, the change laws of scour depth and arrangement method for spur-dike in bend channel are concluded, and design basis are provided for the scour protection to subgrade river side at concave bank. References | Related Articles | Metrics

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The application of vacuum surcharge preloading in expressway soft foundation strengthening HUANG Zhi-yuan 2003, 22(2): 80-83.  Abstract ( )   PDF (187KB) ( )   The paper presents the application and effect of the vacuum surcharge preloading method in expressway soft foundation strengthening by a practical example ;some effective probing experiment were carried on. References | Related Articles | Metrics

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Research on occur and harness of retaining wall in North Tianshan section of G217 highway WU Si-fei，TANG Hong-mei，CHEN Hong-kai 2003, 22(2): 84-87.  Abstract ( )   PDF (138KB) ( )   The retaining wall is one of important structures, which is widely used in projects.In recent years, lots of the retaining wall in North Tianshan section of G217 highway were damaged strongly .On the basis of investigations in site in detail , the authors summarize the destroyedtypes for retaining wall in this paper, analyse some reasons for retaining wall to be destroyed or damaged , then put forward the relevant harness techniques . References | Related Articles | Metrics

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Research on enhanced or roughen technique runway of V-shaped valley debris-flow YI Peng-ying，TANG Hong-mei，CHEN Hong-kai 2003, 22(2): 88-92.  Abstract ( )   PDF (193KB) ( )   On the basis of different V-shaped debris flow and its flowing state and interaction with valley features, the authors research on bankprotected, enhanced and roughen techniques that include block revetment, retaining wall, seeking out dam and roughen pile.Moreover some key problem about these technique are discussed in detail in the paper. References | Related Articles | Metrics

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Research on mechanism for temperature to transmit in tympanites roadbed YUAN Jian-yi，CHEN Hong-kai，TANG Hong-mei 2003, 22(2): 93-95.  Abstract ( )   PDF (1091KB) ( )   The diversity of temperature is an important factor for tympanites to occur in highway roadbed. The physical model of temperature transmitting is founded in this paper. Based on the model, applying increment theory of entropy, the transmitting-heat directions of roadbed temperature get demonstrated. And differential equations of two and three dimensions for unsteady state quantity of heat to transfer are observed in temperature field. It has significant senses for more research of tympanites. References | Related Articles | Metrics

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The transfer function-noise models used in analysis of traffic incident influencing ZHU Shun-ying，WANG Hong，LI Guan-shou 2003, 22(2): 96-98.  Abstract ( )   PDF (133KB) ( )   The basic form of the transfer function-noise model and methods for its identifying, estimating and testing are discussed in detail in this paper. Moreover, the model is applied in analyzing influence of traffic volume change caused by traffic incidents in highway tunnel. References | Related Articles | Metrics

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Discussion on node assignment algorithm for multipath traffic assignment LI Zhi-chun，XIONG Yi 2003, 22(2): 99-101.  Abstract ( )   PDF (122KB) ( )   Based on the discussion on some problems consisting in node assignment algorithm for multipath traffic assignment in literatuer 1, a reasonably modified method,which needs path enumeration is proposed. In the end, a numerical ex ample is given to illustrate its application,whose results are compared with those of Dialps algorithm. References | Related Articles | Metrics

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Preliminary research on the measures to harness serious traffic accidents on the mountain roads of West China LI Shu-qing 2003, 22(2): 102-105.  Abstract ( )   PDF (688KB) ( )   According to some serious traffic accident samples happened on the mountain roads of West China, this paper makes a statistics anal?? ysis of reasons and characteristics of these samples, and also makes a probability theory analysis of these samples. It puts out and discusses some measures to be harnessed in this kind of accidents. References | Related Articles | Metrics

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Preliminary research on the development of the rural highway of Chongqing LI Shu-qing，TENG Hong-wei，YUE Shun 2003, 22(2): 106-109.  Abstract ( )   PDF (128KB) ( )   After a big progress of the development of the skeleton freeway and “Eight Hours Chongqing” arterial highway transportation has been made , this paper analyses the relationship between the rural social economy and rural highways of Chongqing and main problems in the rural highways, puts forward the development goals and scales of the rural highway by the way of ” Link Connection” , makes a layout of the rural highway according to the development strategy of ”Three Economy Regions” of Chongqing , and also suggests the policies and measures of the development of the rural highway . References | Related Articles | Metrics

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The application of selecting original-points equally in global-optimization LIU Tang-zhi，GUO Xiao-hong 2003, 22(2): 110-112.  Abstract ( )   PDF (161KB) ( )   On the basis of routine optimization-methods, the paper puts foward a global-optimization way , which can solve all kinds of complicated and more apexes object-functions optimization.It avoids choosing original-points blindly .The results will approach the precision results when the amount of original points selected equally is enough References | Related Articles | Metrics

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Coordination and optimization of the engineering projects YOU Pin，WEI Lian-yu 2003, 22(2): 113-116.  Abstract ( )   PDF (145KB) ( )   A generalized optimization method of engineering projects control system is given which carries out the idea of dynamic optimization management. Based on the principles of system analysis and correlation, this paper presents a coordination degree model in the decision process which aims to evaluating and obtaining the optimum solution. This method has been applied to highway projects and satisfying effects were obtained. References | Related Articles | Metrics

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The umblanced bidding in engineering tender DONG Xiang-yun 2003, 22(2): 117-119.  Abstract ( )   PDF (118KB) ( )   To obtain more profits, bidder requires to adopt some bidding strategies. The umbalanced bidding is an effective method, which is widely used by bidders. The paper analyzes the significance of umblanced bidding and the conditions in which umblanced bidding can be employed. The paper also analyzes the profits and the potential risks possibably brought by the strategy of umblanced bidding. This paper conclusively brings forward an estimated income model on the basis of theory linear programming. References | Related Articles | Metrics

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The layout of flood embankment line in branch river YANG Sheng-fa 2003, 22(2): 120-123.  Abstract ( )   PDF (825KB) ( )   The layout principles of flood embankment line had been done in the branch river. And owing to lack of measured data in flood calculation of the branch river, disposal means of numerical modeling had been advised. The arithmetic example obtained the preferable effect that the layout of flood embankment line in Xiushan county. References | Related Articles | Metrics

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Study on mechanism of reservoir bank rebuilding and prevention measures MIAO Ji-lun，XIAO Sheng-xie，PENG Kai 2003, 22(2): 124-126.  Abstract ( )   PDF (128KB) ( )   The reservoir natural balanced conditions would be destroyed after it is sluiced, and the bank caves continuously. Because of isps short time, paroxysmal and tempestuousness, the caving threatens the bank buildings. Based on the studying of mechanism of reservoir bank rebuilding, the disaster ous factors and the influence are analyzed, and the prevention measures is put forward to. References | Related Articles | Metrics

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Calculation model for open channel division rate based on BP neural network MU De-wei，ZHANG Xu-jin，MIAO Ji-lun 2003, 22(2): 127-129.  Abstract ( )   PDF (112KB) ( )   By use of the additional momentum method and auto-adjustive learning rate, the BP(Back-propagation)network model with three layers is established to forecast the open channel intake ratio .The comparision between the factural values and the aforementioned method shows that the network model can be well used to predict . References | Related Articles | Metrics