最新刊期
      卷 14 ， 期 2 ， 1992

      • PROBABILISTIC EVALUATION FOR STEEL FRAME COLUMNS OF TALL BUILDINGS

        Dai Guoxin, Li Jihua, Xia Zhengzhong Dept.of Civil Engineering
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.001
        摘要：Based on properties of parameters and test data of dom-estic steel,this paper analyses the reliability and partial coefficient forresistance of steel frame columns of tall builings.The result may serveas a scientific basis.It is not only for domestic steel instead of importedsteel in building tall steel structures,but also for compiling concerendstandards.  
          
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      • NONLINEAR RESPONSE STUDIES OF TALL STEEL FRAMES

        Liu Xiaoqiang, Wu Huibi Department of Civil Engineering
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.002
        摘要：Considerable eftects of geometric nonlinearity upon tallsteel frames and flexibly jointed steel frames are recognized.Systematicanalysis philosophy of geometric nonlinearity under various coordinatesystems and its corresponding explicit expression of tangent stiffness matrices are comprehensively embodied.The entries in tangent stiffnessmatrices with its nonlinear behavior and its abstrusely implied physicmeanings are expounded and a straight forward derivation technique ofnonlinear matrices is given.A computer algorithm which can performwhole range studies of steel frames by considering geometric and materialnonlinearities up to the ultimate load carrying capacity is implemented.  
          
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      • A STUDY ON HYDRATE AND CARBONATE RESISTANCE OF CONCRETE WITH GANGUE CEMENT

        Pan Yixiang, Xu Bin Dept.of Building Material Engineering
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.003
        摘要：This paper studies the hydrates and the characteristicsof micro-structure of concrete with gangue cement before and after carbonation under different curing conditions.It is compared with Portlandcement concrete,and the carbonate resistance of concrete with ganguecement is studied too.  
          
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      • A LOCATING DESIGN AND MANAGEMENT OF MODERN ENGINEERING AT A JOB SITE

        Xiao Weipin Dept.of Construction Management Engineering
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.004
        摘要：This paper discusses methods of system design and sys-tem management of modern engineering at a job site on the generalplanning.They include system functions,system objects,system structure,system models,and the evaluational technique of planning system designand system management.  
          
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      • ANALYSIS OF THE BEHAVIOUR OF HIGH STRENGTH BOLTED SHEAR CONNECTIONS

        Rao Xiaofeng, Wu Huibi Dept.of Civil Engineering
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.005
        摘要：On the basis of experimental tests,a formula is proposedfor the computation of the load-deformation curves of the single highstrength bolted connections in axial shear forces,which is a piecewisefunction describing three stages of friction,slipping and bearing of theconnections,and is also suitable for the non-slip connections.The limitstate method is used to compute the behaviour of high strength boltedconnections subject to eccentric shear,in which each bolt obeys thenon-linear relationship aforementioned.In this paper,the computer pro-gram is worked out to solve the non-linear problems.Analytical resultsare shown to be in general good agreement with experimental data.  
          
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      • A STUDY ON REINFORCED BEAMS OF HIGH STRENGTH ALKALI-SLAG CONCRETE

        Chen Jianxiong, Pu Xincheng, Gan Changcheng Dept.of Building Material Engineering
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.006
        摘要：In This paper,the characteristics and mechanical prop-erties of high strength and super-high strength concrete(60-120MPa)based on slags and alkaline components are presented.This type ofconcrete can be produced as rapid hardening or super rapid hardeningwith high durability,energy saving and low cost.Based on experimentswith reinforced beams of this type of concrete,its deformation properties,process and characteristics of disruption are described.  
          
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      • STUDY ON GRAVEL-LIME-SAND SILICATE CONCRETE

        Luo Qilie Research Center of Resource Comprehensive Utilization of Chongqing University
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.007
        摘要：In this paper,some parameters of two different technicalprocesses and mixture workability of gravel-lime-sand silicate concreteare disussed.The results show that there is an optimum mix proportionsuitable to strength and workability of that kind of concrete.  
          
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      • Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.008
        摘要：It's very difficult to study high-strenth compositesbecause of the poor adhesion of polyethylene fibres caused by its specialstructural qualities.This paper reports a study of changing the surfacequalities of ultra high molecular weight polyethyene(UHMW-PE)fibres of different draw ratios by plasma and acid treatment.It alsodevotes to the experiments of measuring the fibre resin adhesion bythe pull out technigue,and studies the mechanism of the interface failureby SEM.The experimental results show that there's a significant impr-ovement in the adhesion between the UHMW-PE fibres and the resinafter the plasma treatment and it can be four times stronger,dependingupon the draw ratios of fibres and plasma parameters,The interfacefailure in the pull-out test involved developes along the fibre-resininterface within the fibre,and the skin of the fibre is peeled off.Theadhesion can be improved by combining the plasma etching technique andother methods of treating the surface of UHMW-PE fibre.  
          
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      • A SINGULARITY PROPAGATION FOR SEMILINEAR WAVE EQUATIONS

        Yang Zugui Dept.of Natural Science
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.009
        摘要：This paper discusses the propagation of singularity forsemilinear wave equations.By use of the theory of para-differentialoperators and the method of microlocal analysis,some results for generalsemilinear wave equations are obtained.  
          
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      • NETWORK FLOWS,CUTS AND THEIR RELATIONS

        Li Shengjie Department of Natural Science
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.010
        摘要：This paper first presents the indication functions ofcirculation flow,deviation and cut,and then studies the relatiomsbetween the indication functions of elementary circuit and cut,betweencirculation flow and cut,and between deviation and cut.  
          
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      • A TRANSMISSION DESIGN IN LIFTING MECHANISM OF 50tm TOWER CRANE

        Yuan Lizhong, Gu Xueren Dept.of Mechanical and Electrical Engineering
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.011
          
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      • SOME PROBLEMS BY USE OF BOUNDARY POINT ELEMENT IN BOUNDARY ELEMENT METHOD

        Yan Geng, Ding Fangming Dept.of Civil Engineering
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.012
        摘要：Using boundary point element is one of the treatmentsof corner node problem.This paper further discusses some problems byuse of point element.They mainly include the calculation of stresses atpoint elements,the cause and treatment of singularity in boundary usingequations when point elements are used.An example is given.Correctlyboundary point element has certain practical significance for moreobjective simulation of the actual situation of quantities and improvesaccuracy of results.  
          
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      • SHAPE OPTIMIZATION OF BEAM-COLUMNS

        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.013
        摘要：In this paper,a beam-column design problem is formu-lated into an optimization problem The modern optimization technique,sequential unconstrained minimization technique(SUMT),is used toselect the design vesiables at points.The optimum designs obtained arereasonable and verifiable.This procedure may be used in the design ofbeam-columns.Considerable savings can be achieved due to the effectiveuse of material through the best proportion of the shape of beamcolumns.  
          
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      • Song Liquan, Wang Bingle Dept.of Mechanical and Electrical Engineering
        Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.015
        摘要：In this paper,a new method with general purpose ispresented for balancing the shaking moment of articulated multi-barlinkage.The concept of this method is clear.The moment equation oflinkages is easy to establish and solve.Furthermore its pattern structuremakes it convenient to be programmed.  
          
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      • Vol. 14, Issue 2, (1992) DOI: 10.11835/j.issn.1674-4764.1992.02.016
        摘要：Optimization design of correction of the control systemby a passive network is studied in this paper.The design method guan-rantees collocation of a closed loop pole in a desired position,but alsominimizes the gain of the system amplifier,thus making the technicalrealization of the system easier.The design method is proved in thepaper.  
          
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