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Seismic performance of an existing bridge with scoured caisson foundation

Earthquake Engineering and Engineering Vibration 2014年第S1期13卷 151-165页

作者： Kuo-Chun Chang Yu-Chi Sung Kuang-Yen Liu Ping-Hsiung Wang Zheng-Kuan Lee Lu-Sheng Lee Witarto Department of Civil Engineering Taiwan University (NTU) Professor Department of Civil Engineering Taipei University of Technology (NTUT) Center for Research on Earthquake Engineering (NCREE) Associate Researcher Associate Technologist Technologist Department of Civil Engineering The University of Houston Ph.D Student

This paper presents in-situ seismic performance tests of a bridge before its demolition due to accumulated scouring problem. The tests were conducted on three single columns and one caisson-type foundation. The three single columns were 1.8 m in diameter,reinforced by 30-D32 longitudinal reinforcements and laterally hooped by D16 reinforcements with spacing of 20 cm. The column height is 9.54 m,10.59 m and 10.37 m for Column P2,P3,and P4,respectively. Column P2 had no exposed foundation and was subjected to pseudo-dynamic tests with peak ground acceleration of 0.32 g first,followed by one cyclic loading test. Column P3 was the benchmark specimen with exposed length of 1.2 m on its foundation. The exposed length for Column P4 was excavated to 4 m,approximately 1/3 of the foundation length,to study the effect of the scouring problem to the column performance. Both Column P3 and Column P4 were subjected to cyclic loading tests. Based on the test results,due to the large dimension of the caisson foundation and the well graded gravel soil type that provided large lateral resistance,the seismic performance among the three columns had only minor differences. Lateral push tests were also conducted on the caisson foundation at Column P5. The caisson was 12 m long and had circular cross-sections whose diameters were 5 m in the upper portion and 4 m in the lower portion. An analytical model to simulate the test results was developed in the OpenSees platform. The analytical model comprised nonlinear flexural elements as well as nonlinear soil springs. The analytical results closely followed the experimental test results. A parametric study to predict the behavior of the bridge column with different ground motions and different levels of scouring on the foundation are also discussed.

关键词： Analytical models Cyclic loads Hydraulic structures Piles Pressure vessels Reinforcement Seismic waves Seismology soil structure interactions soils Textile scouring Underwater foundations

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Dynamic Finite Element Analysis for Interaction between Two Phase Saturated soil Foundation and Platform

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China Ocean Engineering 1993年第1期8卷 21-29页

作者： Qian, Lingxi Zhong, Wanxie Zhang, Hongwu Dalian Univ of Technology Dalian China

In this paper, the foundation soil of offshore structure is simulated as a two phase saturated porous medium. The dynamic equations of porous medium and finite element formulation are given. For structural analysis, the technique of multilevel substructure is used, and the saturated soil analysis is set in the highest level substructure model. Based on these theories a dynamic finite element analysis program DIASS for the analysis of interaction between two phase ocean soil foundation and platform structures has been developed. A numerical example is given here to illustrate the influence of the pore water in soil on the structural response of an ocean platform.

关键词： Finite element method Offshore structures Porous materials Production platforms Simulation soil mechanics soil structure interactions Structural analysis Underwater soils

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Dynamic Response of Fluid-Single Leg Gravity Platform-soil Interaction System

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China Ocean Engineering 1993年第2期8卷 187-195页

作者： Kuang, Zhiping Cao, Guoao Tongji Univ Shanghai China

An approximate method is presented to investigate the earthquake response of the fluid-single leg (shortened for S. L.) gravity platform-soil interaction system. By assuming a suitable form of the velocity potential of the radiation waves and by using the motion equation and the boundary conditions, the unknown coefficients can be obtained. Thereafter the function of frequency for the interaction system may also be obtained. In this paper, the difference of the system dynamic response between rigid foundation is analyzed and the influences of the various foundation geometric dimension and the various water-depth on the hydrodynamic loading and dynamic response of the system is illustrated.

关键词： Approximation theory Dynamic loads Dynamic response Earthquake resistance Equations of motion Fluids Foundations Production platforms soil structure interactions Vibrations (mechanical)

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Stochastic Response Analysis of Piled Offshore Platforms to Earthquake Load

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China Ocean Engineering 1993年第2期8卷 177-186页

作者： Zhang, Lifu Luo, Chuanxin Tianjin Univ Tianjin China

In this paper, using the theory of stochastic analysis of the response to earthquake load, a stochastic analysis method of the response of piled platforms to earthquake load has been established. In the method, the strong ground motion is considered as three dimensional stationary white noise process and the pile-soil interaction and water-structure interaction are considered. The stochastic response of a typical platform to earthquake load has been computed with this method and the results compared with those obtained with the response spectrum analysis method. The comparison shows that the stochastic analysis method of the response of piled platforms to earthquake load is suitable for this kind of analysis.

关键词： Dynamic loads Dynamic response Earthquake resistance Equations of motion Finite element method Fluid structure interaction Pile foundations Seismic waves soil structure interactions Spectrum analysis Stochastic control systems Vibrations (mechanical)

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GENERAL SOLUTION FOR LARGE DEFLECTION PROBLEMS OF NONHOMOGENEOUS CIRCULAR PLATES ON ELASTIC FOUNDATION

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Applied Mathematics and Mechanics(English Edition) 1992年第11期13卷 995-1007页

作者：纪振义叶开沅 Anhui Architectural Industry College Hefei Lanzhou University Lanzhou

A new method was presented here based on authors' previous work. This new method can be used to solve the arbitrary nonlinear system of differential equations with variable coefficients. By this method, the general solution for large deformation of nonhomogeneous circular plates resting on a elastic foundation was derived, and its convergence was proved. Finally, the only thing necessary to solve is a set of nonlinear algebraic equations with three unknowns. The solution obtained by the present method has large convergence range and the computation is simpler and more rapid than other numerical methods. The numerical examples indicate that satisfactory results of stress resultants and displacements can be obtained by the present method. The correctness of the theory in this paper has been confirmed.

关键词： Bending (deformation) Differential equations Foundations Nonlinear equations soil structure interactions

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Torsional oscillations of a rigid disc bonded to multilayered poroelastic medium

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第3期6卷 213-221页

作者：王国才陈龙珠 School of Civil Engineering and Mechanics Shanghai Jiaotong University Shanghai 200240 China School of Civil Engineering and Architecture Zhejiang University of Technology Hangzhou 310032 China School of Civil Engineering and Mechanics Shanghai Jiaotong University Shanghai 200240 China

This paper deals mainly with the dynamic response of a rigid disc bonded to the surface of a layered poroelastic half-space. The disc is subjected to time-harmonic torsional moment loadings. The half space under consideration consists of a number of layers with different thickness and material properties. Hankel transform techniques and transferring matrix method are used to solve the governing equations. The continuity of the displacement and stress fields between different layers enabled derivation of closed-form solutions in the transform domain. On the assumption that the contact between the disc and the half space is perfectly bonded, this dynamic mixed boundary-value problem can be reduced to dual integral equations, which are further reduced to Fredholm integral equations of the second kind and solved by numerical procedures. Selected numerical results for the dynamic impedance and displacement amplitude of the disc resting on different saturated models are presented to show the influence of the material and geometrical properties of both the saturated soil-foundation system and the nature of the load acting on it. The conclusions obtained can serve as guidelines for practical engineering.

关键词： Boundary value problems Integral equations Multilayers soil structure interactions Torsional stress

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