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20 March 1996, Volume 15 Issue 1 Previous Issue    Next Issue

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Creep-shrinkage Time-dependent Analysis of Large Span Reinforced Concrets Arches of Stiffen Framework Zhou Shuixing,wu Anbang 1996, 15(1): 1-10.  Abstract ( )   PDF (468KB) ( )   In this paper,a formula of creep shrinkage internal force,which includes concrete layers of different ages by usingthe principle of Energy is derived.The movement farm is used in the formula in order to simulate the analysis of thecreep-shrinkage during actual construction processes.The creep cofficient provided by the Rule[5]and the effective elastic modulus method according to different ages are adopted in the formula to make out calculating procedures,comparingthe calculating results with those of the actual model test. References | Related Articles | Metrics

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Experimental Study of Fatigue Aati-Shear Behavior of Unbonded P.P.C Beam Yang Limei,Zhao Canhui,Jiang Bingzhang 1996, 15(1): 11-16.  Abstract ( )   PDF (322KB) ( )   Based on the test data of 8 beams,this paper studies the fatigue behavior of unbonded P.P.C.beam.In the paper,parameters which influnce the fatigue behavior are mainly disused. The Parameters are the coefficient of characteristic val ue or fatigue load and the coefficient of fatigue load range.And the formula of unbonded P.P.C beam are established bythe auttlor.In the end of the paper,results calculable by the formula are compared with the given by other documents. References | Related Articles | Metrics

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The Comparison of Shear Strength and Behavior of Unbonded P.P.C Beams with Bonded P. P. C Beams Xiao Guanghong, Jiang BingZhang,Guo Jian 1996, 15(1): 17-21.  Abstract ( )   PDF (271KB) ( )   Based on the test results of 50 bonded P.P.C beams and 25 unbonded P.P.C beams, the comparison of shearstrength and behavior of unbonded P.P.C beams with bonded P.P.C beams is made.It is shown that unbonded P.P.Cbeams have lower ultimate shear strength. References | Related Articles | Metrics

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Chaos Analysis of Microcrack Evolution in Cement Concrete Li Guoqiang,Deng Xuejun 1996, 15(1): 22-26.  Abstract ( )   PDF (306KB) ( )   Pheoomenalistic analysis shows that the bifurcation and unstable diffusion of microcrack evolution in cement concrete can be compared to the chaos induced by double periodic bifurcation in a kind of nonlinear equation. Based on different kinds of physical background, this paper developed a mathematical model to discribe chaotic phenomenon of crack evolution.The results showed that chaology is aleffective method for the research of rupture induce by crack evolution incement concrete. References | Related Articles | Metrics

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A New Modified Linearized Danmage Model for Concrete Members Zhao Lei,Chen Qiu 1996, 15(1): 27-33.  Abstract ( )   PDF (361KB) ( )   With the aid of Najar damage theory,a new modified linearized damage model for concrete members is proposed inthis paper.The relevant damage formulas and calculation method of FEM are also given.Numerical results of a concretebeam show that the proposed damage model in this paper is very accurate and may by applied to the damage analysis ofconcrete structures. References | Related Articles | Metrics

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A Study on Structural Properties of SFRC Arch Bridge Under the Action of Ultimate Loadings Meng Yun 1996, 15(1): 34-39.  Abstract ( )   PDF (321KB) ( )   The replacement of common concrete by steel fiber reino forced concrete(SFRC)in the building o lighter andstronger archea has proved to be valid in practice.This article,by according to the analysis of the finite element method,and the comparison of the test results between experimental models and the newly-built testing bridge,testifies that theSFRC arch bridge has an overall advantage to the common concrete arch bridge in its properties when subjected to impactloadings,forced vibrations and other ultimate loadings like seismic ones. References | Related Articles | Metrics

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Study on the Compound of F. C. High Strength Concvete Liu Dachao 1996, 15(1): 40-47.  Abstract ( )   PDF (452KB) ( )   The meChanical Performance of common concrete can be improved by adding other compositions,such as steel fiber,admixture to it,and the light-weight and high strength members can be obtained.The optimum mix of F.C.high strengthconcrete is presented in this paped based on the indoor test and theoretical analysis. References | Related Articles | Metrics

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Inquiry of Differential Settlements Index about Highway Pavement on Soft Soil Foundation He Zhaoyi,Zhou Huxin 1996, 15(1): 48-54.  Abstract ( )   PDF (333KB) ( )   In this paper,about highway pavement on soft soil foundation differential settlements problem, the aditional stressanalysis model is presented on differential settlements to pavcment structure.Using 8-point equation parameter finite elemints mothod,the affection is analysed about differential settlements value to pavement structure. Finany,the differentialsettlements index value is produced and is for deeping study reference. References | Related Articles | Metrics

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Review on Seepags Researches of Fissured Rock Mass(Ⅰ) Chen Hongkai 1996, 15(1): 55-60.  Abstract ( )   PDF (391KB) ( )   Seepage in fissured rock mass is quite important and existed broadly in geotechnical engineering such as hydraulicelectricity.traffic and building construction.Most of stability of slope and dam base and rock mass bearing capacity ofbuilding foundation and dam base are influenced and/or controlled by seepage in these media.On the basis of seepage re search results for 40 years this paper chiefly makes reviews in details on some efficiencies and some questions about seepage analytical model and permeability of rock mass. References | Related Articles | Metrics

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Engineering Project Construction Investment and the Enterprise System Shen Qiming 1996, 15(1): 61-66.  Abstract ( )   PDF (382KB) ( )   This paped briefly analyses the development and evolution process of enterprise system,engineering project construction investment and the characteristics of engineering project construction investment under every enterprise system,andit.discusses the investment problem of engineering project construction when we pursue modern enterprise system. References | Related Articles | Metrics

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A Method of Papidly Surveying and Mapping the Road Traffic Accident Sites Chen Jianping,Jin Tianran 1996, 15(1): 67-76.  Abstract ( )   PDF (520KB) ( )   This paper introduas a method of photog rammetric surveying the road trsffic accident sites using a common cameraand mapping the road traffic ardent sites by microcomputer.This method costs less time and energy than that of mannulsurveying,and overcomes the weakness of slow speed and poor quality of mannul mapping.This mehtod is at low cost,easy to be grasped, and the accuracy is in accordance with the requirement,and can beused as a proof in court. References | Related Articles | Metrics

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Some Studies on Fractal Theory in Science of Environmental Communication Chen Hongkai, Tnag Hongmei 1996, 15(1): 77-81.  Abstract ( )   PDF (329KB) ( )   On the basis of the main studing object and the main studing contents of the science of environmental communication,we have made some general reseaches on the fractal theory in the science in the parer.The results identify that faculty-fractal is the basic feature of the communication environment system,managerial-fractal in the basic feature of themanagement of the system,and information-fractal,bine-fractal and geometric-fractal are the basic features of the appraisal of the system. References | Related Articles | Metrics

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Theory and Practice in the Mechanical Construction System of the Asphalt Paving (Ⅶ)──The Computer Simulation of Mechanical Construction System Guo Xiaohong,Guo Jiaying, Du Zhengde 1996, 15(1): 82-92.  Abstract ( )   PDF (464KB) ( )   By the way of computer simulation,the mechanital construchon system of the asphalt paving is simulated. References | Related Articles | Metrics

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Niyuan Shoal Hindering Navigation Causes and Improvement Methods Zhang Guangping 1996, 15(1): 93-98.  Abstract ( )   PDF (380KB) ( )   Niyuna shoal is located at the upstream of Shixikou power station project.while the power station operating,velocityof Niyuan shoal and water surface slope increase,leading to boats upstream navigation hinded. Through survey and calculation, this parer gives the causes of hindering navgation the the improvemnt methods.After the practical operating,theregulated waterway obtains best economic profits. References | Related Articles | Metrics

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Researches on Surveying Strategies of GPS Higher-grade Highway 3-D Control Networks Feng Xiao,Li Fang,Deng Xiuejun 1996, 15(1): 99-104.  Abstract ( )   PDF (396KB) ( )   In this paper general network strategies,surveying methods and reasonable coordinate systems in GPS hiqhway control surveying are researched.Two practicable nework types and corresponding surveying and data processing methodsare submited.Some problems about connection with local or national geodetic natworks are also discussed.It is consideredsuitable for most of local civil engineerings on some conditions designning and constructing in WGS84 Gause-Kruger andellipsoid height system. References | Related Articles | Metrics

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A Optimization Design for 2K-H Planetary Gear System Yin Li 1996, 15(1): 105-112.  Abstract ( )   PDF (399KB) ( )   This paper deals with tile optimization of a few parameters of 2K-H planetary gear system.They are in-mating anggular Which is is selected by enhancing contact strength,ratio of module and central distance m/a,Which is determined by equivalent rule of contact and blanding strength, and tooth width ratio to get small volume of this system.At last,CAD for 2K-H[A] planetary gear system is realized. References | Related Articles | Metrics

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Knowledge Acquisition and Knowledge Base Building for Mechanical Design Expert System(Ⅰ)—A Discussion Dealing with Some Typical Problems Miao Yi,Yin Li 1996, 15(1): 113-119.  Abstract ( )   PDF (382KB) ( )   Knowledge acquisition and knowledge base building is one of the most important problems in building an expert system.The systems appoach is applied in this paper to map out the design propram, which simplified the processis of building the knowledge base in perfect order.Some methods are described to deal with some typical problems of mechanical design,such as the representation of figures and tables by spline intepolation,checking part’s strength with fuzzy factor,the application of optimization,etc.The structure and function of knowledge base management module is also described. References | Related Articles | Metrics

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Orthogonal Analysis for Factors Influencing Clay Strength Liu Lang, Yu Pei 1996, 15(1): 120-124.  Abstract ( )   PDF (256KB) ( )   There are many factors influencing clay strength,in which dry unit weight,water content and porosity ratio arequite important.Testing datas are analysed by orthogonal design method,then we research degree for the three factorsaffecting clay strength,and study the best state in sorne extent of the three factore of clay. References | Related Articles | Metrics