SOIL-STRUCTURE-WATER INERACTION OF A CABLE-STAYED BRIDGE UNDER SEISIMIC EXCITATION
Seismic performance of a long-span cable-stayed bridge is studied with soil-structure-water interaction being included in this paper. Soil-pile interaction is modeled using individual impedance matrix to replace piles below the mudline. Water-structure interaction is simulated with added mass and damping coefficients for pile foundations of the bridge. Hydrodynamic added mass and damping coefficients of the pile caps are obtained through the concise closed form expressions which were deduced by Bhatta and Rahman (2003). Morison Equation is applied to calculate the added mass and damping coefficients of a single pile. Hydrodynamic grouping effects of grouped piles are considered with grouping effect coefficients. Nonlinear time history analysis is conducted with the finite element model of the bridge. The analysis results show that hydrodynamic effects have no significant influence on the maximum internal force responses of towers and their underlying piles. However, hydrodynamic effects might increase the maximum internal force responses of piers underlying piles about 10~20%. Therefore, it is necessary to consider water-structure interaction in seismic analysis of long-span cable-stayed bridges.
Soil-structure interaction Structure-water interaction Morison Equation FFT Cable-stayed bridges Seismic analysis
Yong GAO Wancheng YUAN Xiaoguang JIN
Ph.D Candidate, State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China College of Civil Engineering, Chongqing University, Chongqing, China
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）