最新刊期
      卷 16 ， 期 2 ， 1994
      • Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.001
        摘要：In order to investigate the influence of concrete strength,horlzontal and verticalportions of anchorage length and cover thickness etc,upon the mechanical performance of 90-degreehooks of beam upper bars in exterior joints,static experiments of 40 beam- column subassemblagesare carried out. This study emphasizes the damage characteristics of the anchorage zone,measures thestrains of the bars along the anchorage length and analyzes the special anchorage mechanism of suchhooks of beam bars.  
          
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      • Lai Ming, Yang Hong
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.002
        摘要：Through a logarithm normal distribution to draw a nonlinear responese maxi-mum value distribtuion,this paper dissctisses a reliability of eartquake resistant structure under ef-fects of rare earthquakes.  
          
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      • Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.003
        摘要：Using the method of homogenous testing design this paper analyses a steel cranebeam with right angle sudden change height near supports of different geomitry parameters by the fi-nite elements.The part of height stress point and the stress con cen tration parameter in the beam arefound.After analysing more element nonlinear regression,the relationship between stress concentra-tion parameter and geomitry parameter is established.This paper also discusses both source ofanalysing result error and effect.  
          
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      • STUDY ON THE PROCESS OF MASS LOSS FOR FRUIT IN A COLD STORAGE

        Chen Qigao, Tang Minefang
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.004
        摘要：This paper discusses the procesa of mass lase for fruit in a cold storage with theo-ry of mass transfer and shows that fruit mass loss under constant storage temperature is relative tothe temperature,humidity and moisture diffusive factor,which can give theoretical base for some ac-tual methods for measuring technique decreasing mass loss.  
          
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      • NUMERICAL CONCRBTE-SIMULATING OF MESO-LEVEL STRUCTURE OF CONCRETE

        Qian Jueshi, Zou Dingqi
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.005
        摘要：Theoretical analysis on the numerical simulation meso-level structure of concrete is sttJdied systennatically a ndsome simulated restiIts are givL1ii in this paper.THL3 existi ng prub-lems on the numerical simulation of meso-level structtire and discussed.  
          
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      • EFFECT OF CALCINED SHALE ON TNE PORE STRUCTURE OF CEMENT PASTE

        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.006
        摘要：By means of the test the pore strticture of cement pastes incorporating calcinedshale,the results show the effect of calcined shale on the pore sturcture of cement pastes.and the ef-fect of calcined shale on the strength of cement pastes with the changing of pore structure. The workprovides an experimental and theoretical basis for the usage of pozzolanic admixture.  
          
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      • Liu Dongyan, Zhu Keshan
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.007
        摘要：Mixed mode fracture in rock subjected to compressive loading has many differ-ent features in fracture hehaviour from those subjected to tensile loading,especially when the aper-ture is partly or fully closed.The traditional theory of elastic fracttire mechanics can not be used tosolove compressive-shear fracture problem. Based on fracture characteristics of rock under compres-sion,the formulas to calculate stress intensity factor are updated so that the new strength criterion isevolved to evaluate the crack initiation streilgth.The stress distribution and the relative displacementof crack surface in central slit is confirmed by FEM analysis.  
          
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      • Feng Ya, Chen Qigao
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.008
        摘要：The paper analyzes the thermal characteristics of a natural ventilation cold stor-age,It shows that the calculating temperature in or outside the room is mainly effected by atmo-spheric temperature and the calculating temperature for a cold storage. They are determined by thelocal meteorological parameters.  
          
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      • THE ELECTRIC CONTROL TECHNIQUE OF THE HYDRAULIC LOGIC VALVE

        Sum Xiaosong, Sun Zhengpei
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.009
        摘要：This paper presen ts the electric con trol devive of the hydraulic logic valve.Itcontrains mainly two parts, a push button control and a microrocomputer wireless telecontrol.Thedesign and adjustment of the hardware and the software program are also presented.The results ofthe experments to the hydraulic system of the loader show that the device has the features of smallvolume,excellent performance,low cost and easy to develop software.  
          
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      • THE PROBLEMS AND THE COUNTERMEASURES ABOUT THE CURRENT REAL ESTATE

        Wu Shoubao
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.010
        摘要：The problems of the current real estate are conscientiously analyzed.The maineight prublems of the current real eqtate are enumerated.In accordance with the problems.six coun-termeasures are advanced.  
          
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      • Xu Weiliang, Wu Huibi
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.011
        摘要：This paper presents a simplified plastic zone method with consideration of the in-fluences of the PDelta. residual stress ,degradation of crosssectional stiffness and plastic zone lengthon the stiffness matrix for second-order elastic-plastic analysis of steel frames. The method not onlymakes up for a insufficiency which is that the degradation of crosssectional stiffness and plasticzone length in a member ean not be considered by a plastic hinge method but also overcomes a defectwhich is very costly and time-consuming because a fine mesh discretization across the crosssectionand along the member length is required by a plastic zone methed. Analysis result Shows proposedsimplified rnethod is simple and practical.  
          
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      • Luo Shushan
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.012
        摘要：Looking back on the urban planning of the reeervior area of three sorges alonsthe Yangtze River and integrating with the development of the theory of urban planning and the reqirements of building the reservior area ,ten principles of planning and reconstruction are put for-warded .  
          
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      • OPTIMAL CONTROL ELIMINATING SWING FOR THE LIFTING CAPACITY

        Yao Jiafei
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.013
        摘要：This paper discusses the model for lifting capacity of the crane and optimal con-trol of eliminating swing in lifting process. One half loop control method is presented, which is onlyto examine and measure the trolley speed for eleiminating swing.The fact shows this methOd is sim-ple and practicle for enginceering.  
          
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      • REALIZATION OF PRE-ALERT AND UP-ALEAT IN FIRE DETECTION AND CONTROL

        Wang Jifeng
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.014
        摘要：From a viewpoint of the sectirity and the exactness for a fire system,this paperexplicates the function and the element of two-degree alert(TD),pre-alert and up-alert applied tothe detection and the control in the fire system. An example in the paper deduces the logical expres-sion designing TDA and the hardware logic circuit is given. The paper also presents the software pro-gram realizing TDA utilizing the single chip microcomptiter(87C48),  
          
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      • THE GENERAL DILUTION LAW

        Hu Qiging, Zheng Huaili
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.017
        摘要：This paper presents the general dilution law and it is absolutely exact.It can beuniversally used without any condition  
          
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      • THE CALCULATION OF WATER DISTRIBUTION OF PERIPHERAL INFLOW-OUTFLOW SETTLER

        Long Tengrui, Zhang Zhi, Lin Changguo, Zhang Qin
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.018
          
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      • INTERFACE DESION FOR ELEVATOR

        Wu Longtian, Song Shouxiang
        Vol. 16, Issue 2, (1994) DOI: 10.11835/j.issn.1674-4764.1994.02.019
          
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