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24 June 1991, Volume 10 Issue 3 Previous Issue    Next Issue

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Discussion of the Development of Long-Span Bridges in China Based on the Feasibility Research of the Yangtze River Bridge in Chongqing Gu Anbang, Xu Junlan 1991, 10(3): 1-8.  Abstract ( )   PDF (652KB) ( )   In this paper, based on the feasibility research of the Yangtze River Bridge ifl Chongqing, we discussed the development of long-span bridges in our country. Related Articles | Metrics

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Generalization of the Concept of Negation and Their Application Chen Guozhen 1991, 10(3): 9-15.  Abstract ( )   PDF (504KB) ( )   In this paper, the negations of type FI and type Fd on the post are introduced. A negation is directly related to the fuzziness. As applications of this negation, we give the mathematical definition of fuzziness and discuss its properties. Finally, the relative concepts, measure of fuzziness, semi-Morgan algebras, the sets of type FI and type Fd are also introduced. Related Articles | Metrics

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Transportation Tracking Theory as an Applicationof Control Theory Xu Maozeng 1991, 10(3): 16-24.  Abstract ( )   PDF (630KB) ( )   In this paper a state-space model is proposed for a transportation-road system. In the model investment, pavement distress and transportation capacity are selected as the decision variable, the state variable and the output variable, respectively. With the model and the discussions on predictions of transportation capacity and transportation demand, a transportation tracking problem is formulated and the corresponding model is given. Two sorts of algorithms of the transportation tracking model are derived and their applications are discussed. A case study is presented to show how to deal with practical details. In the end-several important problems unsolved are pointed out. Related Articles | Metrics

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Acting Principle of Trace Accelerating Agent for Early Strength of Lime-Flyash Mixture Liang Fuquan, Ling Tianqing, Liu Xialin, Huang Yi 1991, 10(3): 25-31.  Abstract ( )   PDF (594KB) ( )   In this paper, the acting effect and principle of trace accelerating agent for early strength of lime-flyash mixture are discussed. Related Articles | Metrics

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The Study of the Determination Method of the allowable limiting Point of the Laterally Loaded Pile Wu Hengli, Wang Futing 1991, 10(3): 32-36.  Abstract ( )   PDF (340KB) ( )   In this paper we review some determination methods of the allowable limiting point of the laterally loaded pile, and propose a new method, which is useful in actual engeneering. Related Articles | Metrics

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A New method of Determining the Stress Intensity Factors Yi Zhijian 1991, 10(3): 37-41.  Abstract ( )   PDF (349KB) ( )   A new and effective method of determining the stress intensity factors has been introduced in this paper.Using this method, the stress intensity factors for Mode-I centrically cracked strip and Mode-I eccentrically cracked strip have been obtained, respectively. Related Articles | Metrics

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Universal Ridge Estimates on the Regression Coefficient Yang Hu 1991, 10(3): 42-48.  Abstract ( )   PDF (480KB) ( )   In this paper, based on the linear biased estimates in the present literature, we propose and discuss the universal ridge estimates which is a unitary expression. Related Articles | Metrics

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Experimental Investigation of Diagonal Crack Width for Partially Prestressed Concrete Beams under Repeated Loading Zhou Zhixibng, Jiang Bingzhang 1991, 10(3): 49-55.  Abstract ( )   PDF (488KB) ( )   This paper discusses the main factors affecting the development of diagonal cracks in. P.P.C. beams. A formula for calculating the width of diagonal cracks under repeated loading is put forward based on our test study. Related Articles | Metrics

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A New Method for Locating Non-Symmetric Crest Curve of Highway by the Auxiliary Base Sun jiasi 1991, 10(3): 56-61.  Abstract ( )   PDF (329KB) ( )   This paper gives a method for locating highway non-symmetric crest curves. The method is very simple and practical.It is specifically applicable to the location of highway curves in mountainous terrain. It can serve as a reference. Related Articles | Metrics

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Use of Tbree-Dimensional Connecting Traverse in Surveying the Super-Highway Xu Shitao 1991, 10(3): 62-73.  Abstract ( )   PDF (668KB) ( )   Combining the requirements of surveying the super-highway, this paper raised a series of problems, including the observation, record and adjustment of three-dimensional connecting traverse with EDM introduced in the initial survey of line. In addition, it demonstrated three-dimensional connecting adjustment of condition equations with unknowns. Related Articles | Metrics

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Wave Field Due to a Segmented Generator and Partially Reflecting Walls Qu Shiqiu, Michael Isaacson 1991, 10(3): 74-88.  Abstract ( )   The present paper describes a numerical method for predicting the wave field produced by a segmented wave generator undergoing specified motions in a wave basin which may contain partially reflecting sides. The approach used is based on linear diffraction theory and utilizes a point source representation of the generator segments and any reflecting walls that are present. The method involves the application of a partial reflection boundary condition which is discussed. Numerical results are presented for the wave field due to specified wave generator motions in a rectangular basin. Cases which are considered include both perfectlys aborbiag and partially reflecting beaches along the basin sides, as well as the presence of perfectly reflecting short side-walls near the generator. The method can be used to account adequately for the effects of wave diffraction and partial reflections, and to predict the generated wave field realistically. Related Articles | Metrics

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Pendulum Model of the Free-Electron Laser Shao Mingzhu 1991, 10(3): 89-94.  Abstract ( )   PDF (942KB) ( )   The interaction between the free-electron and laser field has been considered; the longitudinal equation for an electron has been reduced to the pendulum equation, and the gain has been derived by using the energy conservation and the perturbed method. Related Articles | Metrics

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Arrangement and Hydraulic Calculation of Filling Port on Lock Culvert Gu Huanda 1991, 10(3): 95-101.  Abstract ( )   PDF (1122KB) ( )   In this paper, the arrangement and hydraulic calculation of the filling port on lock culvert behind the valve are dealt with and the effects of the filling port upon the pressure behind the valve are searched for. Furthermore, the analysis method is checked by model testing data. As shown in the result, we can raise the pressure in culvert behind the valve by filling water to this area. By contrasting the calculation with experiments, it is clear that the analysis method is reasonable for the calculation of the filling port on lock culvert. Related Articles | Metrics

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Useful Computation of Cross-Sectional Redistributed Internal Force Produced by Concrete Shrinkage for Concrete-Filled Steel Tube Column Wu Bo 1991, 10(3): 102-109.  Abstract ( )   PDF (443KB) ( )   Nowadays the concrete-filled steel tube construction is gradually used in civil engineering. The computation theory of the concrete-filled steel tube is being researched by engineers and other scholars. This construction is the composite material construction. The shrinkage of the core concrete can produce the cross-sectional internal force redistribution. When the core concrete shrinks its creep will take place. The computation of the shrinkage internal force must include the creep of core concrete. This paper puts forward a computation method of the cross-sectional internal force of the concrete-filled steel tube construction that is produced by the core concrete shrinkage. This method meantime considers the concrete creep. The method is considerably simple and easy. The results of computation show that the redistributed internal force is considerably large. This method can be used in the cross-sectional internal force redistribution computation of concrete-filled steel tube arch bridges that is produced by the concrete shrinkage. Related Articles | Metrics

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A Project to High-Lift Vertical Ship Lift with HydraulicSelf-Acting Gate Sill Chen Erjie, Baj Zipei 1991, 10(3): 110-114.  Abstract ( )   PDF (352KB) ( )   This paper discusses and analyses the technical difficulties resulting from applying high-lift vertical ship lift to great amplitudes of headwater level and downstream stage of navigation high-lift dams in mountain rivers as well as downstream stage changes caused instantaneously by a regulating flood peak water plant. The relative principles and measures to solve them are also proppsed. Related Articles | Metrics

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Loading Capability Fuzzy Reliability Analysis of the Bridge Xiao Shengxie, Zeng Derong 1991, 10(3): 115-119.  Abstract ( )   PDF (296KB) ( )   Applying strueture fuzzy theory, fuzzy uncorking possibility of a bridge which is loaded by the standard automobile load is determined.Furthermore, the fuzzy reliability of a bridge which is leaded by the same load is calculated,The result is consistent with the result of experiments. Related Articles | Metrics

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Risk Evaluation of the Engineering Project Alternative Shea Qiming 1991, 10(3): 120-127.  Abstract ( )   PDF (591KB) ( )   This paper describes the possible risks and risk evaluation approaches of the engineering project alternative. Related Articles | Metrics

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Quantum Mechanics Method for the Revolving in an Electromagnetic Field Ning Shiming 1991, 10(3): 128-133.  Abstract ( )   PDF (292KB) ( )   It is difficult to solve the problem of the mass point revolving in aa electromagnetic field. This paper works out the energy and wave function in the ground state and the first excited state when the revolving is in a weak electric field and a weak magnetic field. This method is a quantum mechanics one. Related Articles | Metrics