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23 April 1990, Volume 9 Issue 2 Previous Issue    Next Issue

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Suggestion of a Failure Theory for Rocks Wu Hengli 1990, 9(2): 1-6.  Abstract ( )   PDF (325KB) ( )   In this paper we suggested a failure theory for rocks.Through the analysis of actual examples we obtained some useful conclusions. Related Articles | Metrics

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Inquiry into Shear Strength of Prestressed Concrete Beams Zhou Zhixiang, Jiang Bingzhang 1990, 9(2): 7-11.  Abstract ( )   PDF (355KB) ( )   The formula for the estimation of shear strength of prestressed concrete beams proposed in reference[1]was discussed in this paper.A simpler and more rational formula was put forward for reference. Related Articles | Metrics

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Constitutive Relation and Residual Stress of an Anisotropic Laminate in the Nonlinear Steady Hygrothermal Field Wang Shijie 1990, 9(2): 12-18.  Abstract ( )   PDF (388KB) ( )   This paper investigates the constitutive relation of an anisotropic laminate in the nonlinear hygrothermal field.The general equation of hygrothermal field for nonlinear distribution along thickness satisfying the boundary condition was drawn up in this paper.Therefore,the matrix equations of internal force,strain,residual stress and residual strain for a laminate were obtained.These equations are also applicable to the hygrothermal field of uniform distribution and linearity. Related Articles | Metrics

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Thick Plate FEM Analysis of a Curved Wide Plate Bridge Wu Bo, Qu Guangyi 1990, 9(2): 19-28.  Abstract ( )   PDF (555KB) ( )   This paper puts forward an analysis method for curved wide plate bridges with thick plate elements.This analysis method is quite valid.The effect of shearing deformation is considered in the thick plate elements.Both thick plates and thin plates can be analysed by using the elements.In this paper,the authors presented the analysis results for a two-span continuous reinforced concrete curved plate bridge by using the thick plate elements. Related Articles | Metrics

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Effective Width of Box Girder Bridge Flange and Further Proposals to Highway Bridge Codes Xiang Yiqiang 1990, 9(2): 29-37.  Abstract ( )   PDF (551KB) ( )   Based on reference[1],this paper derives the formula of the effective width of flange for estimating shear lag effect in box girder bridge.After studying the effective width of the simply supported and cantilever box girder of different ratios of width to span under point load or uniform load and consulting research reports and design codes concerned on box girder,the paper offers further proposals concerning the estimation of shear lag effect in box girder bridge to the current native highway bridge codes,which may be used as a reference for the design and modification of highway bridge codes. Related Articles | Metrics

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Analysis of Bond Anchor Bolt in the Tunnel Wang Cheng 1990, 9(2): 38-44.  Abstract ( )   PDF (398KB) ( )   The present paper theoretically proposed a better computational method of support by anchor-sbotcrete for bond anchor bolt in axial symmetry.The action between all the bond anchor bolts and the rock medium was equivalently dealt with in a volumetric force applied to the surrounding rock and is considered in the fundamental equations of the problem.Thereby,the better elastoplastic solution is obtained in consideration of the bond anchor bolt. Related Articles | Metrics

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The Mechanical Analysis of Plate on Visco-Elastic Winkler Foundation under Moving Load Huang Xiaoming, Deng Xuejun 1990, 9(2): 45-51.  Abstract ( )   PDF (381KB) ( )   In this paper,the displacement expression of plate on viscoelastic Winkler foundation under moving load is obtained,in which Fourier transformation is used.In order to simulate the vehicle load on the road,the formula is derived assuming that the load moves with uniform velocity.The formula under this load is obtained.It is important to analyze the dynamic character of rigid pavement. Related Articles | Metrics

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Site Measurement and Investigation of Fender piles ofPontoon Wharfs Zhang Zhihong, Yang Yingyun, Yang Chengyu 1990, 9(2): 52-58.  Abstract ( )   PDF (401KB) ( )   A method for measuring the horizontal displacement of the fender piles over and under the water surface,and deflection curves of the rubber fenders simultaneously at the different points with the displacement transmitters when 10000-tonner-oil carrier berths at the pontoon wharf is described in this paper.According to the measured data,the berthing impacts which act on the fender piles,elastic curves and effective energy absorption curves of the piles are analysed.The depth of embedment,the maximum moment of the piles and the value of the coefficient of soil reaction "M" are calculated by cantilever beam method and "M" method respectively.The calculated results are also compared with the designed values. Related Articles | Metrics

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Application of Superposition of Singular Solutions and Finite Element Solutions to Solve Stress Intensity Factor Wu Chengping, Zhang Lukun 1990, 9(2): 68-74.  Abstract ( )   PDF (358KB) ( )   This paper presents a new calculation of stress intensity factor for mode I fracture in 2-D deformation state,in which finite element solutions are superposed on the singular solutions,and rectangular element is taken in the finite element method.In this paper,explicit expressions for calculating the above stress intensity factor are given. Related Articles | Metrics

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The Research on Composite Material Damage Factor Jiang Guobin, Wang Min 1990, 9(2): 75-78.  Abstract ( )   PDF (272KB) ( )   In this paper, a new damage factor of composite material is derived which has obvious and definite physical meanings based on the concept of rate strain energy in linear elastic theory, by applying the distribution of stress field in the crack tip region. Related Articles | Metrics

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Some Theorems on the Diophantine Equation xn+(x+1)n+…+(x+h)n=(x+h+1)n Zou Zhaonan 1990, 9(2): 91-97.  Abstract ( )   PDF (390KB) ( )   In this paper,we prove that when:(1)n=p-1(p>3),2α|n(α>0),n≢-2(mod2α+3);(2)n=k(p-1)(p>3),k(1)/(2)(p-1),2α|n(α>0),r=[(h+1)/(p)],r(p+1)≢0,2(mod2α+3),to the Diophantine Equation xα+(x+1)α+…+(x+h)α=(x+h+1)α there are not any positive integer solutions. Related Articles | Metrics

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Sensitivity for Linear Restricted parameter Estimations Yang Hu 1990, 9(2): 98-105.  Abstract ( )   PDF (474KB) ( )   This paper discusses the sensitivity for linear restricted parameter estimations on the disturbance of design matrix, observation vector and restricted condition, and obtains appropriate sensitivity theorem for generalized ridge estimate and principal components estimate. Related Articles | Metrics

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A Circuit Axiom of Ditroids Cheng Shijun, Chi Jie 1990, 9(2): 106-109.  Abstract ( )   PDF (286KB) ( )   A circuit axiom of ditroids is presented in this paper. Related Articles | Metrics