Archive

20 April 1999, Volume 18 Issue 2 Previous Issue    Next Issue

---

For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

Select

Nonlinear Aerostatics Behaviours of Super Long Span Supension Bridges Fang Mingshan, Xiang Haifan, Xiao Rucheng 1999, 18(2): 1-7,12.  Abstract ( )   PDF (296KB) ( )   In order to give a valuable reference to wind resistance design of super-long-span, nonlinear aerostatic stability theory and program have been applied to analysis on super-long-span suspension in this paper.Through analysing and comparing the whole process of wind-velocity increasing of the bridge models, some important conclusions are obtained. Related Articles | Metrics

Select

The Bearing Capacity Calculating of the CFST Arch Bridges Tu Lin 1999, 18(2): 8-12.  Abstract ( )   PDF (191KB) ( )   In recent years the concrete filled steel tubular(CFST) arch bridge has been developed rapidly, but the calculating method of its bearing capacity lags behind comparatively.This paper discusses the imperative problems about reliability system and the solid-web section. Related Articles | Metrics

Select

Effects of Different Longitudinal Restraint Conditions in Main Girder on the Seismic Behavior of Long-span Cable-stayed Bridges Hao Chao, Liu Min, Qiang Shizhong 1999, 18(2): 13-19,60.  Abstract ( )   PDF (307KB) ( )   The dynamic behavior of long-span cable-stayed bridges subjected to seismic excitations is systematically investigated, based on a case study for Wuhan White Shoal Cable-stayed Bridge over Yangtse River, with particular emphasis on the effects of different longitudinal restraint conditions in main girder on the seismic performance of this bridge.Finally, several conclusions are drawn from the above study. Related Articles | Metrics

Select

Establishment of the Non-linearity Multistage Fatigue Damage Equation of the Concrete Material Zhao Yongli, Sun Wei 1999, 18(2): 20-26.  Abstract ( )   PDF (259KB) ( )   With the basic concept of damage mechanics and based on the fatigue damage equation of concrete materials, the multistage fatigue damage process of concrete materials is deeply and theoretically analyzed.Accordingly the pathway of multistage fatigue damage with the characteristics of independence and continuance is provided, and the non-linearity multistage fatigue damage equation of concrete materials is inferred.The equation clearly reflects that the loading sequence has an effect on the fatigue accumulating life expectancy;with the use of this equation the effect of overloading on the material life expectancy is analyzed. Related Articles | Metrics

Select

The Effect of Axle Load Limit on the Pavement Maintenance Cost Ni Fujian, Deng Xuejun 1999, 18(2): 27-31.  Abstract ( )   PDF (196KB) ( )   Based on the statistic data and prediction data of the vehicles in China, the axle load distribution models of four axle load limits were developed.According to pavement types and axle load distributions of different axle load limits, the pavement life was calculated.In the case of the main highway's (national and provincial highway) mileage, grades, past years, pavement types and maintenance approaches in China, the annual maintenance cost of different axle load limits was estimated.The results showed that axle load limit affected the pavement maintenance cost greatly, especially, when axle load limit reached 13 ton, the annual pavement maintenance cost would increase greatly.And, the axle load limit becomes bigger, and the enforcement level will become more sensitive to pavement maintenance cost. Related Articles | Metrics

Select

Discussing Interchange Aesthetics(Ⅳ)——Interchange Bridge Aesthetics Wu Guoxiong, Sun Jiasi 1999, 18(2): 32-36.  Abstract ( )   PDF (203KB) ( )   Interchange bridge is an important part of interchange, and it affects the overall view of interchange.This paper summarizes the characteristics and design acquirements first, and then the outline of bridge aesthetics from both the overhead structure and the supporting structure, in order to guide, evaluate and intact the planning and designing of interchange. Related Articles | Metrics

Select

The Theory of Composite Sandwich Box-Beam Wu Zulie, Zhang Peiyuan 1999, 18(2): 37-43,50.  Abstract ( )   PDF (279KB) ( )   Based on the theory of composite box-beams and the analyses model of sandwich box-beams, we establish the control equations and boundary conditions derived by the principle of minimun potential energy, and give the general method of solution. Related Articles | Metrics

Select

Research and Application of the Mechanical Construction System Theory of the Cement Concrete Pavement(Ⅰ)——Mathematical Description of the System Zhang Haijun, Hu Junhong, Nie Chunsheng 1999, 18(2): 44-50.  Abstract ( )   PDF (246KB) ( )   According to working characteristics of the mechanical construction system of cement concrete pavement, this paper presents the mathematical model of this system by applying the theory of stochastic service system to describe the motion law of the mechanical construction system. Related Articles | Metrics

Select

Approach to Disposing Machinery of Material Distribution on Cement Concrete Nie Chunsheng, Liu Tao, Zeng Liwen 1999, 18(2): 51-54,60.  Abstract ( )   PDF (189KB) ( )   From technical、economic and operational perspectives, this paper deals with disposing machinery of material distribution on cement concrete pavement's slipform and suggests that the related units make use of type excavator to distribute material for convenience. Related Articles | Metrics

Select

The Study of Theory and Method of the Circular Road Huang Ping 1999, 18(2): 55-60.  Abstract ( )   PDF (220KB) ( )   This paper is based on the research of the road net structure forming by radiation and ring.Firstly, it elaborates the relations between city transit circular road and city development, transportation requirements, development of products and coordination of landscapes in a new turn of city construction.Secondly, it acquires the mathematical model about the relation between circular route's location and the transportation origin-destination.At last, it deals with the principle of the defining of reasonable radius.So it makes plan of the circular road guided by the transportation requirements and combines with the development of city, forming a graceful building space in the belt between urban district and suburbs. Related Articles | Metrics

Select

Fine Urban Transportation: Its Concepts and Ways Feng Xiao, Guo Dazhong, Cheng Caiti 1999, 18(2): 61-66.  Abstract ( )   PDF (214KB) ( )   Some theoretical problems in urban transportation development are discussed.We mainly focus on its target, ways, measures and optimum solutions of strategies.Three categories of standards of fine urban transportation are suggested, which are "functional targets", "environmental targets", and" resource targets". Related Articles | Metrics

Select

Research on Application of the Void in Mineral Aggregate(VMA) in Bituminous Mixture Design Wei Jianmin, Zhu Daquan 1999, 18(2): 67-70,75.  Abstract ( )   PDF (198KB) ( )   In this paper, the relation between the void in mineral aggregate (VMA) and bituminous mixture capability are analyzed.The void in mineral aggregate is calculated based on the compose-parameter of bituminous mixture.The paper presents the method of proportioning design that controls the void in mineral aggregate, and the result has been checked out by Marshall test and Wheel tract test. Related Articles | Metrics

Select

Research on Experimental Method of Cement-Emulsified Asphalt Mixture Gao YingLing, Tianqing, Liang Fuquan, Qiao Guanhua 1999, 18(2): 71-75.  Abstract ( )   PDF (193KB) ( )   The paper discusses the characteristics of Cement-Emulsified Asphalt Mixture according to which a proper order of mix and a further modified Marshall test method are recommended. Related Articles | Metrics

Select

A Model for Predicting the Residual Deformation of Soft Clay under Impact Loading Bai Bing, Guo Qijun 1999, 18(2): 76-81.  Abstract ( )   PDF (229KB) ( )   Based on laboratory test results, a model for predicting the residual deformation of soft clay under impact loading is proposed in this paper, which fits well with other test results.This model, considering several factors which affect the residual deformation such as confining pressure, impact energy and the number of impacting, can be used for the deformation prediction in the treatment of saturated soft clay by the drainage consolidation method of combining static and dynamic loading. Related Articles | Metrics

Select

Progress Control on Expressway Projects Luo Tao, Liu Jie 1999, 18(2): 82-88,108.  Abstract ( )   PDF (283KB) ( )   In this paper, the concepts of progress control on expressway projects are introduced, and the functions, mission, basis, procedures, main points and methods as well as means of progress supervision and the relationship between progress and quality as well as cost of the project are discussed by analysing main causes that affect the progress. Related Articles | Metrics

Select

Study on Resistance Coefficient of Lock Single-port Liu Pingchang, Liu Yiahui, Wang Yunli 1999, 18(2): 89-94.  Abstract ( )   PDF (242KB) ( )   By studying and analysing the results of model tests, the related factors which have effects on single-port resistance coefficient are obtained.By conducting extensive hydraulic model tests to investigate the resistance coefficient of lock single-port under filling operation, the relationship between single-port resistance coefficient and its related factors(geometric parameter hp/b, r/b, and H/b), culvert-to-port velocity ratio(v1/v3) and reynolds number of port-culver flow is studied, and empirical formulas for single-port resistance coefficient ξ3 and also tributary loss coefficient are derived. Related Articles | Metrics

Select

Scientific Solution of Equivalent Seepage Tensor of Rock Mass in Construction——Taking the Slope of Permanent Shiplocks in the Three Gorges Project as an Example Chen Hongkai, Zhu Keshan 1999, 18(2): 95-99.  Abstract ( )   PDF (195KB) ( )   According to analysis and observations in-situ the authors conclude one solution(i.e.scientific solution of equivalent seepage tensor of rock mass, abbr.SSEST) that is useful in identifying equivalent seepage tensor of rock mass in the construction of Geotechnical project.The solution is effective in fissured rock mass.The solution includes two steps, and the first step is fixed on initial permeability using WCF(water-conduction fracture), and the second is calculating SSEST using the initial permeability.The solution is used successfully in seepage researches in slope of permanent shiplocks of the Three Gorges Project. Related Articles | Metrics

Select

Experimental Study on the Result of Energy Dissipation of Flaring Gate Pier for Low Dam Pivot Ying Chongqing, Liu Yahui, Wang Pingyi 1999, 18(2): 100-108.  Abstract ( )   PDF (337KB) ( )   Based on experimental result of energy dissipation and scour protection for downstream of spillway at Yu Jian Kou power station, this paper discusses the flow characteristics, aerated characteristics of flaring gate pier for low dam pivot, the influence on pressure of dam surface and the result of energy dissipation for flaring gate pier.It is put forward to be an available method to solve the problems of energy dissipation and scour protection for depth of covering strata, poor geologic condition and weakness of resistance to scour capability under reasonable use of flaring gate piers and auxiliary dissipaters.Thus, a new method is obtained for release of floodwater and energy dissipation of low dam pivot which are provided with low water head, great unit discharge and low Froud coefficient.It may be used for reference for design and test workers. Related Articles | Metrics

Select

The Model-testing Research of Regulation of Channel for San Daoguai River Reach of Lan Chang-Mekon River Tuo Yao 1999, 18(2): 109-113.  Abstract ( )   PDF (195KB) ( )   This paper deals with the complicated topography of the river bed of San Daoguai River reach and the main hinderance of navigation.Engineering comparative tests have been done based on the recognition of beach nature.It is suggested that the river regulation mainly be the increase of radius of curved path and the improvement of flowing condition in order to guarantee safe navigation under both moderate water level and low water level. Related Articles | Metrics

Select

Study on Tonglexia Rapids Regulation in the Three-Gorge Reservoir Region by Mathematic Model Cheng Houchang, Zheng Yingong 1999, 18(2): 114-122.  Abstract ( )   PDF (354KB) ( )   Tonglexia reach is a typical gorge reach in variable backwater zones of the Three-Gorge reservoir region.Its features of rapids in high level block sailing of ten-thousand-ton fleet in the period of low level.This paper has made use of two-dimension mathematics model.Water stage and velocity field were rightly verified.Sailing condition of Tonglexia reach after reservoir built was modeled.Two kinds of regulation measures, narrow-deep and wide-shallow excavation, were calculated.Results show wide-shallow excavation is more suitable for regulation of gorge reach.In addition, we have analyzed shoal and sailing discharge. Related Articles | Metrics

Select

Experimental Investigation of Local Scour Around a New Type Bridge Pier Wen Cen, Zhao Shiqiang 1999, 18(2): 123-127.  Abstract ( )   PDF (192KB) ( )   An experimental investigation of local scour around a new type bridge pier under a clear water regime is presented.The main characteristic feature of flow is relatively large horseshoe vortex flow along the circumference of the pier.And the procession of scour is discussed in this paper.Equation for predicting the depth and area of local scour hole is presented.It is significant for evaluating the potential for scour around this type pier. Related Articles | Metrics

Select

Experimental Study of Water Diversion and Sediment Prevention at Convex Bank for Feng Dongzi Project in Qujiang River Yin Chongqing, Zhang Xujin, Zhao Shiqiang 1999, 18(2): 128-135.  Abstract ( )   PDF (290KB) ( )   Navigation and hydropower project at Feng Dongzi in Qujiang River is a comprehensive utilization hydro-junction of navigation combining with water power.Water intake for hydro-power station is located at the unfavorable convex bank in the bending river.In connection with the results of model test, this paper studies the different moving characteristics of water and silt in the reach of dam region before and after the project is built.The reasonableness of plane layout for water intake and fail-water channel is shown, and the influence on sand prevention during water diversion for reservoir sedimentation is discussed.It is put forward to project measures of improving conditions of sand prevention during water diversion for hydroplant intake, and synthetic system of sand prevention for intercepting sand, leading sand, and draining sand is adopted.Better effects for sediment control are gained.The recommended schemes have been adopted by design department. Related Articles | Metrics

Select

Research of Navigation Technology on Open Channel of the Three Gorges in Flood Season Shu Ronglong, Cai Ruzhe, Du Zongwei 1999, 18(2): 136-144.  Abstract ( )   PDF (322KB) ( )   Navigation conditions on open channel of the Three Gorges project in flood season are presented in this paper.Feasibility is demonstrated to raise flux of navigation on open channel to 35 000 m3/s by altering large horsepower ship and towing on bank.It provides science evidences to make project of altering ship and towing. Related Articles | Metrics

Select

Analysis of Current Research on Starting Condition of Non-cohesive Uniform Sediment Lan Bo 1999, 18(2): 145-148,152.  Abstract ( )   PDF (195KB) ( )   This paper analyzed starting condition(starting velocity and starting drag resistance) of sediment and many formula and curves are analyzed and evaluated.This is helpful for the selection of starting velocity in practice and research. Related Articles | Metrics

Select

Texture Edge Detection Based on Wavelet Transform Xu Qiong 1999, 18(2): 149-152.  Abstract ( )   PDF (162KB) ( )   According to Mallat's multiscale edge detection principle and the local features of the texture image, this paper popularizes Mallat's algorithm, which not only will be aplicable to general edge detection in the image, but also can be used to texture edge detection in the texture image. Related Articles | Metrics