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20 August 1984, Volume 3 Issue 4 Previous Issue    Next Issue

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Least Square Boundary Method For Sandwich PLates Wang Lei 1984, 3(4): 1-6.  Abstract ( )   PDF (337KB) ( )   This paper adopts Hu Hai-Chan's[l] differential equations for isotropic thick plate (sandwich plate) and corresponding boundary conditions. The unknown constants are determined by means of least square boundary method. The domain method for Galerkin is adopted to satisfy the differential equations. Computed results show high accuracy and practical simplicity. Related Articles | Metrics

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Sine-Squared Potential and Semiclassical descriptio for Dechanneting Process Luo Shiyu, Shao Mingzhu 1984, 3(4): 7-12.  Abstract ( )   PDF (381KB) ( )   The new planar-continum potential-the sine squared potential,is introduced to analyse the dechanneling behaviour of the channeling particle, and the particle motion equation is written by the well-known pendulum equation, the dechanneling behaviour is described by using WKB approximation, The results show that The theory is in good agreement with the experiment. Related Articles | Metrics

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Inquiry Into Application of Trigonometric Series in Variational Methods of the Plane Problem of Theory of Elasticity Zhan Guangqing 1984, 3(4): 13-22,27.  Abstract ( )   PDF (585KB) ( )   This paper tries to derive the mistaken formula of application of trigonometric series in variational methods of the plane problem in the book "Theory of Elasticity" (1951 edition) by Timoshenko and Goodier and Juggests the opinion for correction which can be used as reference in research, teaching and enggineering practice. Related Articles | Metrics

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Research of Character of Soaking Concrete in Liquid Sulphur Xiong Guangze 1984, 3(4): 23-27.  Abstract ( )   PDF (355KB) ( )   This peper examines that the strength of concrete can be obviously increased, The water absorption, the seepage resistance, the freezing resistance and the wear resistance are improved by the utilization of soaking concrete in liquid sulphur. Furthermore, its mechanism and influential factor are analyzed by means of an experiment. Related Articles | Metrics

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The Shear Lag in Flange of Tee-Beams and its Effective Widths Cheng Xiangyun, Tang Kaugen 1984, 3(4): 28-33.  Abstract ( )   PDF (390KB) ( )   In this paper the shear lag effect in the flange of Tee-beams is calculated by the bar simulation method, and an indistinct concept which preexists in the calculation of the moment of inertia of cross sections according to the effective width of flange is clarified, thus,the direet stress values in flauge obtained by the current simplified compution agree well with these practical maximum. Related Articles | Metrics

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Finite Difference Solution in Shear Lag Effect On Contilever Box Girder with Linear Varying Depths Cheng Xiangyun, Tang Kaugen 1984, 3(4): 34-47.  Abstract ( )   PDF (696KB) ( )   In this paper, shear lag effect in cantilever box girder is studied by various approaches assuming spanwise displacement as quartic parabola. Fur thermore the finite difference method is adopted in solving negative shear effect on cantilever box girder with linear varying depth. Theoretical results are also compared with perspex model test. Finally, several preliminary Conclusions are drawn regarding further study and research. Related Articles | Metrics

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A Generalized Model of Ocean Atmospheric Pressure Field and Wind Field in the Calculation of Typhoon Wave Guan Mengru 1984, 3(4): 48-55.  Abstract ( )   PDF (466KB) ( )   The typhoon atmospheric pressure models used rather widely in the calculation of typhoon wave at home and alroad are those of Meyers and Fujita at present.Obviously, these models cannot characterize the atmospheric fields of different ocean typhoon atmospheric structures as they can only reflect ideal ocean typhoon atmospheric pressure field distribution with symmetric circles which leads to the corresponding ocean typhoon field distribution. Consequently, with the further deepening studies on typhoon wave, drifting currents and storm Surge theories, it is a most interested topic in the fields of ocean development, ocean transportation, fisheries and military activities to find a kind of mathematical models which can characterize objectively the changes of ocean typhoon atmospheric pressure fields and wind fields. This paper deals with firstly the derivation of the mathematical models suitable for slowly moving typhoon ocean atmospheric fields and winds based on the Rankine composite vortex model; secondly the derivation of the optimized mathematical models of normally moving typhoon ocean atmospheric pressure fields based on the application of optimization and periodic sample function and thirdly on the basis of the evaluating of various mathematical models, the derivation of a generalized mathematical model suitable for ocean atmospheric pressure fields and wind fields with any given typhoon structure by the aid or correction nad spreading of the hyphotheses of Rankine and Matano. All the mathematical models presented in this paper can be concretized by computer calculation based on the historical typhoon data which will be introduced in another paper. Related Articles | Metrics

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With Gradual Recursion Method to Determine the Reasonable Regidity Ratio of the Upper and Lower Chords of the Long Span Prestressed Arched Truss Bridge Lin Xianrong, Qian Yuyu 1984, 3(4): 56-74.  Abstract ( )   PDF (996KB) ( )   This paper adopts the method of the gradual regression analysis and the ability of the computer's program and as well as induces the quantitative analysis by means of relative data to the reference (1), so that L. Q-qualified function on the controlled internal forces are determined, therefore the analysis solution of the rational stiffness ratios of upper and lower chords on the prestressed concrete cantilever arched-truss bridge is found. Related Articles | Metrics

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THE SEDIMENT SOURCE AND RIVER GEOMORPHOLOGIC PROCESSES OF THE JIALIN RIVER Gu Hengyue 1984, 3(4): 75-83.  Abstract ( )   PDF (773KB) ( )   The Jialin River basin has a catchment area of 158,000 km2, long-term average of annual runoff is 65.1 billoin m3,and it is the largest tributary of the upper reaches of theYangtze River.Owing to the stratum broke, and the rock weatherirg has been strong, and so the soil erosion has been severe in this watershed. In addition, there are population explosion and destroying deforestation. Such expansion, in return, aggravates the losses of soil and water flow the catchment area, thus forming a vicious circle. Though irrigation projects for controlling the floods and to silt up sediment,by tens of thousands, have been completed throughout the watershed, but long-term average of the erosion modulus achieved to 1100 T/km. So the Jialin river has become the highest sediment concentration tributary of the Yangtze River system. It is near to Futuo River which is a tributary of the Yellow River system, with the greatest sediment discharge among the rivers in the world. The average of annual runoff of the Jialin River is only 10% of that of the Yongtze River,but the average of annual sediment about 1.92×108T is 45% of that of the Yangtze River, so far as the sediment concentration is concerned,it ranks the sixth among the major rivers in the world. sediment concentration among the major rivers in the world.Arguing from the river system point of view, this paper analyses the causality between the ecological equivalence of the watershed and the hydrologic properties of the river with the sedimentary source and its regional composition of the Jialin River. According to some typical reaches cases of fluvial processes of the Jialin River, this paper discusses the actions and effects of the flow with hyperconcentration of sediment for the geomorphologic process in this river. Related Articles | Metrics

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Non-Pressure Seepage Calculation Zhao Yingqi 1984, 3(4): 84-91.  Abstract ( )   PDF (473KB) ( )   This paper puts forward a new solution for non-pressure seepage calculation we obtain the following monotone continuous function.f(h0)=h2-h1+h0ln（h2-h0)/(h1-h0)-il,(i>0)(1) f(h'0)=h1-h2+h'0ln(h2+h'0)/(h1+h'0))-i'l.(i<0)(2)Furthermore, basing on the function exp.(1) or using the dichotomy we obtain ho or ho'. We present the results of the general program of TI59/58C pocket calculator and calculate three con crete examples. Related Articles | Metrics

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The Influence Line of the Multiple Arch Calculation by the Direct Stiffness Method Xu Shengchao 1984, 3(4): 92-99.  Abstract ( )   PDF (434KB) ( )   The paper utilizes every column property in the inverse matrix of the multiple arch stiffness matrix to draw the influence line of the multiple arch. Related Articles | Metrics

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A Wind Tunnel Test of Segmental Models of a 360m Suspension Bridge Zhu Shuan Lai 1984, 3(4): 102-110.  Abstract ( )   This paper describes a wind tunnel test of segmental modes of a flexible suspension bridge with main span 360 m in static condition, including the entire process, Contents, current phonomena and test results, this paper also gives the curves of the coefficients of three components (lift, drag and torsional moment) under a constant wind force, and the influence of the stiffened girder shape, the wind penetration rate of the deck, pedestrian load and the influence of the tailing on tue wind resistance of the structure. Related Articles | Metrics

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Process-State Theory (Foreword)-Possibility and Necessity which it Produces and its Foundations Wang Zheng-Ping 1984, 3(4): 111-118.  Abstract ( )   PDF (677KB) ( )   This paper puts forword that process-state theory is a high level scientific mathodo-logy based on information theory, cybernetics and systems theory. Process-state iheory is an integrating and mathematizing scientific mathodology that it blends modern philosophy and modern mathematics together with all kinds of methodologies. Related Articles | Metrics