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25 April 1988, Volume 7 Issue 2 Previous Issue    Next Issue

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Bifurcation in All Domain for Channel Particle Luo Shiyu, Shao Mingzhu, Tan Jiangning 1988, 7(2): 1-5.  Abstract ( )   PDF (266KB) ( )   By developing Moliere potential to the fourth-order terms and taking account of motion dampping and applied field, the motion equation has been reduced to Duffing equation, and the further discussion on the bifurcation of this system has also given. Related Articles | Metrics

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Two Resuits of Intersection of Matroid And Antimatroid 1988, 7(2): 6-9.  Abstract ( )   PDF (273KB) ( )   In this paper, the properties of intersection of matroid and antimatroid are studied in general:aproperty of rank function of system (E, μ∩) and a dual property of weighted system(E, μ∩). Related Articles | Metrics

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On the Theory of Small Platic Region for A Power Hardening Material Jiang Guobin, Zhai Zhendong 1988, 7(2): 10-16.  Abstract ( )   PDF (400KB) ( )   In the case of sub-brittle fracture, at the crack tip there is a small plastic region of which effect should not be neglected. In this paper, the authors consider that both the crack length and the stress at infinity change are due to plasticity, and compared the results calculated by five different methods. Related Articles | Metrics

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On Checking Computation of Stresses in Flexible Surface Wang Jinyan 1988, 7(2): 17-24.  Abstract ( )   PDF (544KB) ( )   In this paper, A method for Check on stresses in flexible pavements with Mises yielding condition is presented. Related Articles | Metrics

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An Approximation Method for Calculatign lateral Forces Due to Longtudinal Prestressing in Trapezoidal Concrete Box Section Zhang Shiduo 1988, 7(2): 31-38.  Abstract ( )   PDF (387KB) ( )   In this paper, special behavior of single-cell trapezoidal box section is discussed particularly with longer cantilever slabs. Then, investigational reports on box section and other section in the United States and Canada are given with dimensions on cross-sections as well. An approximate methos is developed to compute the lateral forces due to longitudinal pretressing considering the losses due to frictionand wabbling effect. An illustrative example shows the procedures for estimating the lateral forces in top and bottom slabs. Related Articles | Metrics

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The Analysis of Space Large Defletion in Cable-stayed Bridges Wang Xiangjian 1988, 7(2): 39-47.  Abstract ( )   PDF (484KB) ( )   In this paper, second order nonlinear analgsis is incre ased on the basis of refeve-nce[1]. Large displacement stiffness matrix of the eccentric space thin-walled giroler and space combinad cable element were derived. nonlinear analysis of large deflection used non-move coordinate system, so that the static contribution of elastic stiffness, geometric stiffness and large displacement stiffness can be determined Separately. Nonlinear static equations are solued by modified NewtoN-RapsoN method, Lastly, the numerical examples are given. Related Articles | Metrics

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Development Trend in Cable-stayed Bridges to Long-span Qu Qinglu 1988, 7(2): 67-72.  Abstract ( )   PDF (376KB) ( )   This paper enumerates the present situation of over 30 cable-stayed bridges which have been built in the world. Based on the analysis of the development history of cable-stayed bridges with steel-beams, prcstressed concrete beams and composite beams, and of cable-stayed bridges with singletowers, the author presents the analysis of development trend in modern cable-stayed bridges to long-span for reference. Related Articles | Metrics

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Mearsurement of Poisson's Ratio of Composite by Real-time Laser Holograph Xie Dong 1988, 7(2): 73-77.  Abstract ( )   PDF (1024KB) ( )   In this paper, a method for measuring Poisson's ratio of composite by real-time laser holograph is introduced. The fundamental principle of the method is described briefly. Some specimens made of ID aligned fiber with 0° and 90° angle CFRP and GRP plates are measured. It is understood that the method is very convenient and especially suitable for materials with rough surface and low value of Poisson's ratio. Related Articles | Metrics

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A Study on the Properties of Resisting Low Temperature Cracking of Asphaltic Mixture with Wast Rubber Powder Fan Tongjiang 1988, 7(2): 78-89.  Abstract ( )   PDF (920KB) ( )   The subject of this study is mainly to investigate the effect of improving the property of common asphaltic mixture when an appropriate amount of waste rubber powders are added on resisting low temperature cracking with the split cylinder test, the little beam bending test, the bhringkage test and unconfined compressive stress test of laboratory-compacted specimens. The results obtained from a series of tests show that the addition of 3-5% (by weight of mixtures) waste rubber powders to bituminous concrete reduces the resilient modulus and increases the deformation at low-temperature upto four times respectively,and the glass translating temperatures are droped down ten more degree centigrade than the asphalt concrete without any waste rubber powders. It goes without saying that the ability to resist low-temperature cracking of asphalt concrete has been greatly strengthened. Therefore, it's propounded that the materials above mentioned may be suitable for use of building the high-type road in the cold northern sector of our cou ntry. Related Articles | Metrics

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Design Rules for Coastal Engineering And Standard of City Flood Control Yang Bingzheng 1988, 7(2): 90-97.  Abstract ( )   PDF (643KB) ( )   The design of any city flood control project must be based on reliable hydrologic studies. For cities near coast, it is necessary not only to know the regulation of the flood regimen of a stream, but also to be concerned largely with wave action, tide movement, ocean currents and similar phenomena. Therefore, the investigation and analysis of the rules will be greatly conducive to the design of coastal engineering, and also be important in preparation of the national standard of the city flood control. Related Articles | Metrics

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Atmospheric Corrosion Resisting Steel Bridge Fan Shicheng 1988, 7(2): 98-104.  Abstract ( )   PDF (493KB) ( )   The author had taken an observation on bridge engineering in Japan. This paper is a part of the technical report the present situation of application and investigation of atmospheric corrosion resisting steel bridge in Japan are introduced, and its distinguishing points in structural design are described. Finally, the. opinion of the author on its application in China is given Related Articles | Metrics