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23 June 1990, Volume 9 Issue 3 Previous Issue    Next Issue

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Experiment and Analysis for the Behaviours of the Prestressed Concrete Hollow-Core Slabs with Cold Drawn and Spiraled Low Carbon Wire Xu Xibin, Wang Zhenglin 1990, 9(3): 1-11.  Abstract ( )   PDF (746KB) ( )   On the basis of the analyses and researches of the prestressed concrete hollow-core slabs with cold drawn low carbon wire,nine full-scale prestressed concrete hollow-core slabs with cold drawn and spiraled low carbon wire were tested and the cracks,displacement,failure form and ductility behaviour of these slabs were analysed and discussed with quantities of theoretical calculations.According to the experimental researches and theoretical calculations,some recommendations for design are given in this paper. Related Articles | Metrics

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Generalized Displacement Method for the Analysis of Thin-Walled Box Curved Beam Jin Weiliang, Zhao Guofan 1990, 9(3): 12-20.  Abstract ( )   PDF (541KB) ( )   Based on the summerization of the analysis of thin-walled box curved girder,the generalized displacement method of thin-walled box curved girder is established in this paper.The quintic polynomial displacement function for curved girder and the analytical relation between the warping torsion and deformation of the box section are presented.Two numerical examples are used to demonstrate the application and correctness of this method. Related Articles | Metrics

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The Driver Behaviour and Road Environment Wang Jian 1990, 9(3): 21-29.  Abstract ( )   PDF (585KB) ( )   The road environment (such as signs) is an important element which affects the driver behaviour.In this paper,the study data have been obtained,the imposition of the speed limit and the presence of the police cruiser have a marked effect in reducing the number of vehicles that travel at an excessive speed.Therefore,instead of the fixed check-point,the police authorities may use the cruiser to enforce traffic regulations. Related Articles | Metrics

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The Correlation Equation of Two-End Deformational Additions of Steel Beam-Columns (II) Li Kaixi, Xu Wanming 1990, 9(3): 30-40.  Abstract ( )   PDF (721KB) ( )   This paper makes an analysis for the correlation of two-end deformational additions of elastic-plastic steel beam-columns when axial load is changed,establishes interaction equations of two-end deformational additions of beam-columns with additions of transverse loads and axial loads,and makes it possible for the inverse calculation segment length method to be used to calculate the ultimate strengths of frames. Related Articles | Metrics

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The Research on Anti-Cracking Strength for Inclined Section of Reinforced Concrete Beams Zhou Zhixiang, Jiang Bingzhang 1990, 9(3): 41-49.  Abstract ( )   PDF (538KB) ( )   In this paper,taking prestress degree as a variable,partially prestressed concrete,general reinforced concrete and fully prestressed concrete are unified into an identical set of reinforced concrete.The effects of prestress degree,shear span ratio and concrete strength on the anti-cracking strength Qf of reinforced concrete beams are studied and a formula for computing Qf is put forward,based on a vast amount of test data. Related Articles | Metrics

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Linear Estimators on the Large-Scale Regression System Yang Hu 1990, 9(3): 50-58.  Abstract ( )   PDF (562KB) ( )   In this paper we propose and study the problem of the linear estimator in the large-scale regression system.Some good criteria,singular value functions of all kinds of estimator and a new method of classification have been given,too. Related Articles | Metrics

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Fuzzy Self-Evaluation Method for the Overall Level of Transportation Network Construction Yang Tao, Xu Jiqian 1990, 9(3): 59-64.  Abstract ( )   PDF (381KB) ( )   In order to evaluate the overall level of transportation network construction with multi-index method,the Fuzzy Comprehensive Evaluation Method has been cited and modified in this paper.The Fuzzy Subjection Matrix can be set up by relative comparison between the sample data.Therefore,much surveying work can be saved,the subjective aspect can be decreased,and the reliability can be increased. Related Articles | Metrics

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Initial Approach of the Principle and Solution of Bridge Expanded Joint Damage Meng Yun, Lai Ming 1990, 9(3): 65-70.  Abstract ( )   PDF (1998KB) ( )   (Force-) Beating Area and,"Force-Transferring Area" exist on both sides of the bridge expanded joint.One of the main problems of causing the joint damage and shortening the life of the bridge is the defect and damage of the filling materials used in the areas.This paper describes,by means of finite element method,the inner-force of the "Force-Beating Area" and the "Force-Transferring Area",and points out the possibility of the replacement of the common concrete and other materials with SFRC in the two areas.And it's quite possible to prolong the life of the bridge by consolidating the expanded joints with SFRC. Related Articles | Metrics

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Reaction Behaviour and calculation Method on Irregular simply-Supported Skew Girder Xia Gan 1990, 9(3): 71-79.  Abstract ( )   PDF (569KB) ( )   In this paper,the studies on irregular simply-supported skew girder are continued,and more formulae used for calculation reactions and internal forces under commonly occurring loading are derived.In order to understand the behaviour of the reaction of the irregular skew girders several tgpes of tgpical skew garders are discussed.Lastly,the calculation method of the simply-supported skew girder is advanced in which the redistribution of internal forces are considered,and an example is given. Related Articles | Metrics

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Site Measurement of Berthing Velocity Wu Songren, Ren Zuogao, Yang Yingyun 1990, 9(3): 80-85.  Abstract ( )   PDF (368KB) ( )   This paper describes the principle and the method of the site measurement of the berthing velocity with displacement transmitters,introduces the working principle and mechanism of the transmitters,and the measurement system,and discusses the way to measure the berthing velocity,berthing angle,plane turning,fender deflection and the berthing impact.The typical measured waves and results are presented as well. Related Articles | Metrics

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Galerkin's Solution to the Nonlinear Bending Equilibrium Problem of Skew Plates Cai Songbai, Li Cunquan, Li Jiabao 1990, 9(3): 86-95.  Abstract ( )   PDF (500KB) ( )   In this paper,we overcome the difficulty of the trial function exactly satisfying force boundary conditions Mn=O by reducing the order of control equations and obtain an infinite set of nonlinear algebraic equations by Galerkin's method.These algebraic equations can be truncated to obtain the solution of any desired degree of accurary by Newton-Raphson method. Related Articles | Metrics

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A Mathematical Description of the Situation ofMechanical Movement in the System ofAsphalt Blending-Spreading Guo Xiaohong 1990, 9(3): 96-106.  Abstract ( )   PDF (566KB) ( )   In this paper an attempt is made to present a description for the situation of mechanical movement in the system of the asphalt blending-spreading.It is based on the knowledge of the probability and the mathmatical statistics.The mathematical model has been set up.This model is used for describing the situation of mechanical movement in the system. Related Articles | Metrics

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The Elementary Solving Process and the GeneralSolution to a Kind of Ordinary DifferentialEquations with Variable Coefficients of 2nd Order Hu Guoquan 1990, 9(3): 107-112.  Abstract ( )   PDF (309KB) ( )   For a certain function relation between the variable coefficient p (t) and q (t),the general solution to an inhomogeneous linear differential equation of second order x"+p (t) x'+q (t) x=f (t) can be directly found by the simple elementary integration in this paper. Related Articles | Metrics