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19 August 1985, Volume 4 Issue 4 Previous Issue    Next Issue

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Shallow Wave Forces on Offshore Structures Wu Songren, M·Isaacson 1985, 4(4): 1-8.  Abstract ( )   PDF (621KB) ( )   The present paper considers the prediction of wave loading on large offshore structures under steep shallow wave conditions for which severe nonlinearities may be presented. A numerical nonlinear diffraction method developed recently has been made more efficient in various ways so that forces can be calculated economically. This method is compared with other approximate prediction methods and with wave force experiments for surface-piercing cylinders subjected to steep shallow waves. It is found that of the methods considered, the nonlinear diffraction predictions agree most closely with the measured forces. In addition, it is theoretically justifiable and reasonably efficient. Related Articles | Metrics

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The Position Technique and Its Applications Luo Shiyu, Shao Mingzhu, Diao Chunyu 1985, 4(4): 9-17.  Abstract ( )   PDF (751KB) ( )   In recent years, the Position Physics was developed into an active frontier science and corresponding position technique was applied widely. In this paper, elemental principle and technique were presented and its new application and newly-development in condensed physics and chemistry were reviewed. Related Articles | Metrics

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Design of Partially Prestressed Highway Bridges According to Degree of Prestressing Fan Shicheng 1985, 4(4): 18-26.  Abstract ( )   PDF (623KB) ( )   The author proposes that the partially prestressed highway bridges be designed according to the degree of prestresing. In this paper, the design method and its merits are explained. The calculations for the projects in the "Standard Design Drawings JT/GQB 025-75" has been made. Based on this, the influence of the degree of prestressing upon the steel requirement and the relations between the degree of prestressing and the crack width have been analyzed. The crack control by hypothetical tensile stress is too conservative and unsuitable for lower degree of prestressing. Therefore, the recommendation for design of PRC bridges by means of hypothetical tensile stress is improper. Related Articles | Metrics

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Calculation of Force on Bracing Pole of Floating Ponton Wharf Fan Ziming 1985, 4(4): 27-31.  Abstract ( )   PDF (317KB) ( )   In order to improve the conditions on movement of ponton and decrease the active force of bracing block, an energy absorber was installed at the end of bracing pole of floating ponton wharf. In this paper, a differential equation of motion is applied to solve the kinetic energy of ponton. On these basis, the force on bracing pole of floating ponton wharf can be calculated. And the calculated result was approaching to the measurement of field test. Related Articles | Metrics

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Computation of the Influence Lines for Lateral Load Distribution in Straight, Skew and Horizontal Curved Bridges Using Rigid-Diaphragm Method Zhang Shiduo 1985, 4(4): 32-40.  Abstract ( )   PDF (537KB) ( )   This paper not only deals with the criteria of rigid-diaphragm method for computing the lateral load distribution in straight, skew and horizontal curved bridges, but also presents formulae of calculating the influence lines of specified girder for lateral load distribution. When diaphragms are considered as to be supported on main girders with the properties of bending and torsional springs, the necessary expressions of influence lines of lateral load distributions in straight, skew and horizontal curved bridges can be obtained. Finally,a conclusion has been drawn out. Related Articles | Metrics

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Studies on Several Important Concepts in FEM Zhuo Jiashou 1985, 4(4): 49-55.  Abstract ( )   PDF (428KB) ( )   In this paper, the following problems are discussed:1) the reason of the coeftcient of internal energy (e. g. strain energy or strain complementary energy) being 1/2, and of external energy (e. g. potential or complementary energy of external loads) being 1;2) a correct view of the replacement of effective nodal loads; 3) a simple method of establishing ‘Sharp Function’; 4) the displacement model and the stress model. Related Articles | Metrics

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Solution of One-Dimensional Unsteady Open Channel Flow by Diffusive Difference Scheme Wu Ziwei, Bai Zhipei 1985, 4(4): 56-64.  Abstract ( )   PDF (474KB) ( )   The method of numerical solution of the diffusive difference scheme for one-dimensional unsteady flow is discussed. The effect of weighted factor a on stability of the solution is analyzed. Using the developed mathematic model for symmetric and unsymmetric open channels, under different initial and boundary conditions, the satisfactory results are obtained. It shows that this difference scheme can be used in engineering. Related Articles | Metrics

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Effective Width of Flanges for Continuous Tee-Beam Cheng Xiangyun 1985, 4(4): 65-72.  Abstract ( )   PDF (521KB) ( )   Using the refererence [3],this paper proposed the formulae for calculation of the effective width of flanges in continuous tee-beam, and supplemented the data of effective width ratios to the table in the Handbook, edited by F. S. Merritt, Based on this, the suggestions for revision of the provision concerned in the draft of our "Highway Bridge Code for Design" are made。The recommended provision in this paper has advantage of simplicity in calculation, broad range of application and accordance with the actual mechanical situation。 Related Articles | Metrics

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Investigation on the Patterns of Highway Transition Curve Zhao Jiaxing 1985, 4(4): 86-97.  Abstract ( )   PDF (665KB) ( )   According to the rectangular coordinate K-L, there are a great many different function expressions of OA to join the final point of a straight-line and the starting point of a circular curve. These expressions may be used for deriving a transition curve of highway. They can be a cube of parabola, an algebraic expression of sine function, 5th, 6th and nth power function of algebraic expressions. The author recommand the 5th power function of algebraic expression as a transition curve of highway after analyzing and comparing with other patterns. Related Articles | Metrics

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Research of Landslip and Its Prevention Zuo Jian, Kong Qingrui 1985, 4(4): 98-104.  Abstract ( )   PDF (491KB) ( )   Various special appearances are produced by the geological effect of load, for example, landslip, mud-rock flow etc.. They have extensively been researched in engineering geology which is considered as one of the important motive forces that accelerate the earth's crust exchanging and developing for a long time. This is not only an event of realistic significance in national economy, but also an event of practical significance in research of the formation and evolution of the earth's crust. Especially, it is a necessary and an urgent matter for acelerating mountain area construction and making people in poor area live and work in peace and contentment. Related Articles | Metrics