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23 February 1990, Volume 9 Issue 1 Previous Issue    Next Issue

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A Study for the Ultimatn Strength of Fixed Steel Beam-Columns Li Kaixi, Xu Wanming 1990, 9(1): 1-9.  Abstract ( )   PDF (582KB) ( )   A new method and a comoprehensive computer program are developed for calculating the ultimate strength of fixed steel beam-columns. The influence of all initial imperfections is taken into account. On the basis of extensive calculation, a simplified method for checking the stability of fixed beam-columns is presented, and the calculated results show a good agreement with the theoretical values. Related Articles | Metrics

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Fracture Mechanics Analysis for Mode III Dynamics ofComposites Li Zuqiang, Jiang Guobin, Feng Guangzhan 1990, 9(1): 10-15,9.  Abstract ( )   PDF (357KB) ( )   By the comprehensive use of Laplace transform and Fourier transform, in this paper we make a theoretical analysis of stress (9, Continued on p.9) Ontinued from Page p. 15) intensity factors of crack-tip mode III dynamics of laminate composites with through cracks under dynamic load. Taking impact load as an example, we investigate the influence of changingthe outer thickness, tensile modulus and shear modulus on stress intensity factors of crack tip and provide reference for better fracture mechanics properties of composites. Related Articles | Metrics

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Some Extensions on the Upper Bound of Rayleigh Quotient Yang Hu 1990, 9(1): 16-23.  Abstract ( )   PDF (385KB) ( )   This paper generalizes the corresponding results in[2], Some upper bounds of the matrix Rayleigh quotient X'AX(X'X)-1 and general form X'AX(X'BX)-1 are given with the measures of trace, spectral norm and Euclidean norm. Here A and B are all nXn positive definite matrixes. X is nxp matrix of ranks p. Related Articles | Metrics

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Failure Criteria for Concrete and Experiment of Concrete Strength under Biaxial Compressive Stresses Zhao Renda, Wang Shouqing, Che Huimin 1990, 9(1): 24-31.  Abstract ( )   PDF (473KB) ( )   Based on the experiment, this paper investigated concrete strength under biaxial compressive stresses, and some existing failure criteria of concrete were reviewed and compared with each other by calculating. Comparison of the test results with those of other researchers was made. From the viewpoint of practical use in engineering, a proposed formula for predicting concrete strength under biaxial compressive stresses was presented. Related Articles | Metrics

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An Adjusting Energy Method of Calculating Tensile Forces of Strips for Reinforced Earth Retaining Wall Ling Tianqing, Wu Chengping 1990, 9(1): 32-39.  Abstract ( )   PDF (429KB) ( )   In this paper the method of calculating tensile forces of strips for reinforced earth retaining wall is analyzed. Therefore on the basis of the energy method an adjusting energy method of calculating tensile forces of strips for the reinforced earth retaining wall is given. Calculated results in this paper is more approximate to the measured value than the present methods. Related Articles | Metrics

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The Analysis and Experiment of the Macro-Initial-Yielding of Hollow Microsphere Filled Composites Tang Yu, Zhang Peiyuan, Yan Bo 1990, 9(1): 40-44,23.  Abstract ( )   PDF (403KB) ( )   Based on the equivalent homogeneous model, (, Contiaued on P.23) Continued Jrom p.44) the macro-initial-yielding of hollow microsphere filled composites is analyzed by the theoretlcal and FEM methods. The macro-initial-yielding function suggested includes the physical properties and geometric factors of the components and gives a theoretical explanation to the phenomenon that the plastic behavior of the composite is sensitive to its average stress. The comparison between the numerical calculation and experimental results shows that the theoretical analysis is reliable enough. Related Articles | Metrics

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The Dual Heything Algebra and Dual IntuitionisticNegation Chen Guozhen 1990, 9(1): 45-53.  Abstract ( )   PDF (479KB) ( )   One of the purpose of this paper was to give another algebraic structure with fuzziness. It is the dual Heything algebra. We introduced some, concepts, like a dual intuitionistic negation, fuzziness, measure of fuzziness on it, and gave many of their properties.The extension of these concepts to the theory of fuzzy sets is natural. They turn out to be the dual intuitionistic fuzzy sets, fuzziness and measure of fuzziness for dual intuitionistic fuzzy sets. Related Articles | Metrics

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Asymptotic Behaviours of Nonlinear Ordinary Differential Equation with Delay Integral Perturbation Term Xu Anshi 1990, 9(1): 54-60,53.  Abstract ( )   PDF (480KB) ( )   The asymptotic behaviours of the solutions to the nonlinear differential equation of the type with delays:y'(t)=f(t,y(t))+g(t,y(t)y(t-τ(t))∫t0th(t,s,y(s),y(s-τ(s)))as)t∈[t0,∞]y∈R are studied.The main tools used here are new integral inequalitieg. The sufficient conditions on boundedness, stability and exponential asymptotic stability of the solutions are established. Related Articles | Metrics

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Structural Analysis of Thick Plate and Thick Plate with Circular Holes on Elastic Foundation Huang Wei, Deng Xuejun 1990, 9(1): 61-69.  Abstract ( )   PDF (553KB) ( )   This paper gives a finite prism superposition solution for a rectangular thick plate and thick plate with circular holes on elastic foundation. This method takes simply supported and sliding clamped structures as basic structures whose stiffness matrixes often have a very narrow bandwidth, thus significantly reducing the computational effort and storage requirements of three-dimensional analysis compared with three-dimensional finite element. In this method,a program has been developed. The prism element includes rectangular four-node-line prism and triangular three-node -line prism as well as eight-node-line isoparametric prism. The correctness of the method and program has been proved by many examples and tests. Related Articles | Metrics

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Platoon Method of Analyzing Capacity and Delay of Non-Signalized Intersection Wang Wei 1990, 9(1): 70-79.  Abstract ( )   PDF (590KB) ( )   In this paper, the vehicular driving model at the non-signalized intersection is studied based on a large number of experiments and observations. It is considered that traffic stream possesses platoon character when it passes the non-signalized intersection under the situation of larger traffic volume.The capacity and delay of straight vehicles at six types of non-signalized intersections are analyzed by using identical model according to the platoon theory. Finally,the method to determine the actual capacity and limitation capacity of the non-signalized intersection is presented. Related Articles | Metrics

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Bleaching Mechanism of White Cement Clinker in Different Actuating Medium Liu Wanzhen, Jiang Yihua 1990, 9(1): 80-86.  Abstract ( )   PDF (543KB) ( )   This article advances the bleaching mechanism of white cement clinker from an angle of gas, liquid and solid, and deals with the effect of bleaching result on the v-ariety and density of medium. A brief introduction has been made to various techniques of bleaching clinker and methods of raising the whiteness of white cement. Related Articles | Metrics

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A New Property of Mean Value for The Power Hu Guoquan 1990, 9(1): 87-92.  Abstract ( )   PDF (274KB) ( )   In the range of increasing elements (or decreasing elements) X=(X1,X2,…,Xn). this paper discussed some important properties of meaa value for Tth power fn(t,q,X). Related Articles | Metrics

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Theoretical Analysis of the Combustion of Water-Fuel Mixtures in Combustion Engine Shao Yimin 1990, 9(1): 93-102.  Abstract ( )   PDF (604KB) ( )   This article mainly introduces equilibrium stoichiometric modeland solution to the combustion of water-fuel mixtures in internal combustion engine. It brings out the program calculation and eXperimentresults of the effects of water-fuel rat-io(W/F) and air-fuel ratio(A/F) on the equilibrium concentration and the ther-modynamicquality parameter of the combustion gas under adiabatic conditions. Related Articles | Metrics

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Random Simulation of Flood Hydrograph and Its Application in Ascertaining Flood Control Capacity Cui Zhencai, Zhai Guojing 1990, 9(1): 103-114.  Abstract ( )   PDF (711KB) ( )   The relevant flood control capacity of a reservoir was taditionally calculated by designing flood hydrograph and by regulating flood. Then what about the error of this simplified method? This is a problem which the hydrologists have paid more and moreattention to. The aim of this paper is to make an analysis and comparison of the above mentioned methods by way of statistics and experiments, or the Monte Carlo Method(M-C).The method recommended in this paper is like this:set up a flood hydrograph model on the basis of the flood feature of a certain river-basin:simulate enough flood hydrographs with the M-C Mehtod; regulate the floods one by one according to the reservoir flood-releasing rules and then a flood control result will be achieved that can meet the designed standard.This method is compared with the traditional one soas to provide some references for a more reasonable method in calculating the flood control capacity of a reservoir. Related Articles | Metrics