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22 July 1996, Volume 15 Issue S1 Previous Issue    Next Issue

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Outline of 《Bridge's Destruction Mechanism and Relative Calculation Mode Study Under the Acts of Mountain Torrents》 Xiao Shengxie 1996, 15(S1): 1-7.  Abstract ( )   PDF (492KB) ( )   This paper expresses the foundamental conceptions of how the subject has been brought forward,including tile technical way in research, and summarizes the main points and relative law conclusions of the research are given. Related Articles | Metrics

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PFRC Beams and Their Applications in Tongxing Bridge Zhou Zhixiang, Feng Zhiyong, Wang Zhenyin 1996, 15(S1): 8-13.  Abstract ( )   PDF (436KB) ( )   Based on the prestressing principle of the existing preflex beams, a new preflex reinforced concretc beam (abridged as PFRC) is proposed by the first author. The PFRC beams have the advantages of both the existing preflex beams and conventional prestressed concrete beams, and avoid their disadvantages. The manufacturing art and principle of the beams are presented in this paper. The main test re suits of 5 PFRC beams are given and the applications' in Tonsixing Bridge are briefly introduced. Related Articles | Metrics

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Fractal Feature and Its Meaning of Distribution of RockMass Fracture Structures in Permanent Shiplocks of the Three Gorges Project Chen Hongkai, Zhu Jianglin, Zhang Yongxing, Zhu Xiaoyin 1996, 15(S1): 14-18,36.  Abstract ( )   PDF (390KB) ( )   On the basis of some analyses on distribution of rock mass fracture structures in permanent shiplocks of the Three Gorges Project, we have studied fractal values of fracture structures in and near the area where the shiplocks locates and in the first section every shiplock roon. All results identify that fractal feature exsits in the area and in sections every shiplock room. Fractal values are useful in selecting typical section in all shiplock rooms, which may be more reasonable than the general selection. Related Articles | Metrics

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Nonlinear Analysis of Wanxian Yangtze River Bridge Liu Zhong, Gu Anbang, Zhou Shuixing 1996, 15(S1): 19-29.  Abstract ( )   PDF (758KB) ( )   In this paper, the geometrical nonlubearities, temperature and humidity changes, time dependenl effects of concrete, material nonlincarities, method of construction and others to Long-span Stiffen Framework Reinforeed Concrete Composite Arcb Bridges have been analysed. The stability and load bearing capacity of Wanxian Yangtze River Bridge have been evalualed. Related Articles | Metrics

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Being Extensively Used Day by Day of the Unbonded Prestressed Concrete Technique Yang Limei, Jiang BingZhang 1996, 15(S1): 30-36.  Abstract ( )   PDF (494KB) ( )   This paper expounds the survey on the applying of the unbonded prestressed concrete technique in China. and it gives some examples of bridges constracted by this technique. These examples make known that this technique can be used in bridge engineering and havs a vast vista. This paper simply recommends the rules of the design and construction of the unbonded prestressed concrete. At the end, it gives the results of experimental research on ultimate shear strength and fatigue strength of the un bonded partially prestressed concrete beams. Related Articles | Metrics

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Queries to a Well-known Closed Form Elastic-plastic Solution for Mode Ⅲ Crack Yi Zhijian 1996, 15(S1): 37-42.  Abstract ( )   PDF (413KB) ( )   The analysis of the present paper shows that the well-known Hult-McClintock closed form clastic-plastic solution is inappropriate even under ihe conventional small-scale yielding conditions. The expressions expandod from the Hult-McClintock solution arc quite inconsistent with the exact solution ob taineed by the near crack line analysis. This solution is not be able to describe the elastic-plastic feature near the crack surface region. Meanwhile, this solution leads to singularities in the plastic strains, which is physically unacceptable. Related Articles | Metrics

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A New Kind of Measure of Information Loss in Parameter Estimation Yang Hu, Dong Zhiqing 1996, 15(S1): 43-49.  Abstract ( )   PDF (392KB) ( )   The condition appling the simple least squares estimator to parameter estimation without any loss of information, given by C. R. Rao in 1965, is difficult to satisfy in practice. In document [2] a kind of measure of information loss was given. This paper, by means of document [3], discusses another kind of measure of information loss and concludes that the result of docament [3] is a new kind of kan torovich inequality, and in the end, we give the inequality (14) that is more general than that of the document[3]. Related Articles | Metrics

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Hydrodynamical Effect on Collapse in Reservoir Banks Cheng Changhua, Deng Boqiang 1996, 15(S1): 50-58.  Abstract ( )   PDF (580KB) ( )   Based on the field data and the typical investigation of hydrodynamical effect on collapse in reservoir banks, this paper analyses the mechanism of reservoir banks collapse and deeply studies some speical relationships between wave Height、collapse and depth. Related Articles | Metrics

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A New Curve Method for Designing Highway Horizontal Alignment Comprehensive Method Wu Guoxiong 1996, 15(S1): 59-64.  Abstract ( )   PDF (371KB) ( )   This paper introduces a new curve method for designing highway horizontal alignment. After a hand-worked curve which meets the control of country is drawn by using the basic principle of 3-order spline curve. alignment sketch composed by a series of. tangency and arc is splined to form by using fig ure software. Then spiral curve is set between tangency and arc, or between.arcs. At last, a horizontal alignment is drawn by using the design method of alignment unit. Related Articles | Metrics

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Nonlinear Calculation Model of Granular Base Materials Ling Tianqing 1996, 15(S1): 65-72,78.  Abstract ( )   PDF (499KB) ( )   First using the full-scale experiment and non-linear elastic theory in china, the paper analyses the granular materials and builds up the caculation model. Related Articles | Metrics

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Researches on the Reform Direction of Subject System of Transport Economics Qiao Lezhong, Huang Chengfeng 1996, 15(S1): 73-78.  Abstract ( )   PDF (477KB) ( )   By discussing the vise and developement of subject system of transport economics, this paper pointsont that a new theory called Transport Demand Theory. has been developed Therefore, this paper offers new names of the three parts of transport economics which are macro-transport economics, transport demand theory and transport supply theory, and also gives the details of each part. Other questions of veform are discussed, too. Related Articles | Metrics

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Grey Appraisal of Highway Engineering Project Shen Qinming 1996, 15(S1): 79-83,90.  Abstract ( )   PDF (341KB) ( )   This paper briefy introduces the grey appraisal theory and it's aplilication in the appreciation and selection of highway engineering project. Using this method to appraise and select project, it provides a more forthright, effective and suitable method for many targets and characteristics of high-way engineering projects. Related Articles | Metrics

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The Parameter Estimation of MIMO Systems with Constraints on Parameters of Different Equations Xu Maozeng 1996, 15(S1): 84-90.  Abstract ( )   PDF (377KB) ( )   After formulating the parameter estimation problem of MIMO systems with constraints on parameters of different equations, the least square estimates of parameters of the systems are obtained by using vector-dimension-augmenting technique and lagrange's method of multipliers. Based on the structural analysis of the estimating formula, analgorithm of the paramerter estimetes os given. The statistical properties of the estimates are discussed. Related Articles | Metrics

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The Hydraulic Calculation of the Composite Water Transport of Short Passageway and Crash of Triangle Gate Yang Bin, Huang Qiliang 1996, 15(S1): 91-98,121.  Abstract ( )   PDF (487KB) ( )   In this paper, using the hydraulic basic calculation equation of the composite water transport of short passageway and crash of triangle gate, the hydraulic calculation formulas of the composite water transport under filling and emptying are obtained by introducing average (flow) coefficient. In the Light of separate solution of difference form of basic equation, the rationalization of the calculation for mulas are tested and verifyed. Related Articles | Metrics

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Statistical Analysis of Confluent Character between Yangtze & Jialing River Xu GuangXiang, Zhou Huajun 1996, 15(S1): 99-104.  Abstract ( )   PDF (393KB) ( )   The change of rate of discharge between Changjiang River and Jialing River (R) has great effect on their slope of water-surface, sediment transportation, shipping and flood control. This paper makes statisties for 18 years(6574 days) mean daily discharge data of both rivers. The overall and classified frequency curves of R and it's change with discharge are analyzed. Formulus for computing frequency and many characteristic values are given. This paper can be used as reference for scientific research,engineering design and analysis of other characters. Related Articles | Metrics

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The Study on Highway Culvert's Human-computer Interactive Design and Parameterized Drafting Method Tang Yong 1996, 15(S1): 105-109.  Abstract ( )   PDF (358KB) ( )   In this paper, human-computer interactive culvert design is realized by programming with high level language, and also parameterized draft of culvert is achieved by means of graphics interface of AUTOCAD and high level language. A highway culvert CAD system named "HDCADS" is established under the condition of data sharing with the current CAD system of road route. Related Articles | Metrics

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Risk Influence Diagrams and Project Risk Evaluation Cui Xingyuan, Zhou zhi, Yu Yonghe 1996, 15(S1): 110-115.  Abstract ( )   PDF (391KB) ( )   In this paper, based on the general model of project risk evaluation, the new concept of risk influence diagrams is proposed. Then, such a model, connecting with diagram analysis, is put forward.This model is a powerful tool for communicating with risk analysis, experts and owners, for risk evaluation and for risk decision. At last, the paper gives a general program of simplification of risk influence diagrams. Related Articles | Metrics

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Realization of Statistic Management Function in Road-machine Management System Zhou Jianli 1996, 15(S1): 116-121.  Abstract ( )   PDF (349KB) ( )   This paper introduces the specific mothod of realizing statistic modeular of road-machine management system. It also proposes graphical result and this provides prepavation for statistic analysis made rapidly and accurately. Related Articles | Metrics

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A New Design Method for the Right Turn Lane of City Road Crossing Zhu Xiaobing 1996, 15(S1): 122-125.  Abstract ( )   PDF (243KB) ( )   This paper analyzes the characteristics of right turn driving at intersections using an alignment an asymmetric fundamental curve-available to right turn driving as right turn traffic lane, and then explores a new geometric design mcthcxl for ritht turn traffic lane which is called "dignnient melhvxl", this article also discusses the selection of and calculation on alignment geometric parameters. and provides ways and examples of applicalions of the new design method. Related Articles | Metrics

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The Brief Chart for the Calculation of Non-symmetric Alignment Design Unit of Incomplete Spiral Cao Dongguo, Shi Yi 1996, 15(S1): 126-130.  Abstract ( )   PDF (277KB) ( )   This paper derives the direct coordination formula of imcomplete spiral curve and presents a kind of straightforward pattern which is very convenient for solving non-symmetric alignment design unit of imcomplete spiral. Related Articles | Metrics