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20 June 1983, Volume 2 Issue 3 Previous Issue    Next Issue

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The Calculation for the Creep Loss of Stress and the Deformation in the Prestressed Concrete Structure Liu Xiao-ping, Zhou Yi-wu 1983, 2(3): 15-26.  Abstract ( )   PDF (659KB) ( )   This paper analyses the calculating formulae for the creep loss of stress prescribed in the "Design Specifications for Highway" the prestressed concrete bridges being less precise and unsafer in the majority cases.We advance the formalae for the creep loss of stress in prestressed concrete structures',which is based on the linear elasto-creep body theory.The formulae for creep deformation are also presented in this paper.Calculation results and test values can be put in good concord. Related Articles | Metrics

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A Convenient Method of Calculating Pile Forces Qi Xi-ji 1983, 2(3): 41-52.  Abstract ( )   PDF (629KB) ( )   Usually an adopting M-method is used for calculating pile forces of highway bridge in our country,but it is very troublesome to adopt M-method in calculating pile forces.This paper puts forward the convenient equations of M-method according to the original theory.Furthermore,in this paper the values of non-dimensional coefficient are listed in five tables which may simplify the original calculations. Related Articles | Metrics

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Calculation of Parameters α and θ in Extended Application of G-M Method to Cantilever Bridge Cheng Xiang-yun 1983, 2(3): 53-59.  Abstract ( )   PDF (425KB) ( )   This paper presents the calculating scheme of equivalently simply supported span which is twice as long as the cantilever bridge,and the formulas for calculation of the,parameters θ and α.They coincide with the approxiamate solution and the experimental results are better than those suggested in references [1] and [3]. Related Articles | Metrics

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Family of Spline Finite Strip Liu Xiao-yao 1983, 2(3): 71-80.  Abstract ( )   PDF (549KB) ( )   In paper [3] the families of spline elements based on cubic B spline-cardinal spline is presented.In this paper the method has also been applied to the finite strip method,the family of spline finite strip is presented.The accuracy and versatility of the method are demonstrated by several examples. Related Articles | Metrics

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Advancement of the Transition Curve of the Freeway and the Form of the Superhigh Cross-Section of the Banked Bend Chen Min-yao 1983, 2(3): 81-89.  Abstract ( )   PDF (638KB) ( )   Based on the characteristics of the passengers' physiological reactions while driving into a plane curve,this paper proposes the use of William A.McConnell clothoid to be the transitional curve and the vertical curve of the freeway,and the use of the compound curve,which is formed by the linear,square and cubic equations,to be the super-high cross-section of the banked bend. Related Articles | Metrics

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Carbon Black as an Additive for Asphalt Huang Te-tao, Ho Yu-ying 1983, 2(3): 95-100.  Abstract ( )   PDF (491KB) ( )   The research on using carbon black as an additive for asphalt has been progressing since 1962,but it is still a program for research up-to-date.Increasing wearing resistance and durability of asphaltic concrete pavement,reducing temperature suspectibility of asphalt were shown in several previous investigations.To introduce such investigation is the principal aim of this paper.Finally it is suggested that some programs for research may be considered on the asphalt and petroleum residues. Related Articles | Metrics

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The Solution of Plasticity Analysis for Slope Stability Problems Ouyang Zhong-chun 1983, 2(3): 101-110.  Abstract ( )   PDF (608KB) ( )   The plasticity analyses for stability problems is differentiated from the conventional limit equilibrium method by the former in consideration of the soil's stress-strain relationship.It is a new technique to slope stability analysis.This paper presents in all respects the applications of plasticity theory to slope stability problems,and describes the basic concepts of plastisity analyces.The upper bound solutions on critical height of slope in homogeneous soils concerning straight-line,logrithmic-spiral failure surfaces are obtained.Furthermore,the solutions to slope in anisotropic,nonhomogeneous soils are also obtained.Stability factors presented in this paper would be used for engineering practice. Related Articles | Metrics