考虑SSI三种效应的桩基础RC梁式桥抗震性能评估方法研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (5) : 65-72.

论文

考虑SSI三种效应的桩基础RC梁式桥抗震性能评估方法研究

江辉1，李杰2，杨庆山1，朱晞1,刘林1

作者信息 +

Study of the seismic performance evaluation method for pile-foundation rc girder bridges considering three kind of ssi effects

JIANG Hui, Li Jie, YANG Qing Shan, ZHU Xi,Liu lin1

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文章历史 +

摘要

桩-土-桥动力相互作用是桥梁抗震研究的热点和难点问题，需合理考虑地基土柔度效应、运动学效应及阻尼效应的影响。本文采用基于性能点轨迹法的结构非线性静力分析方法，引入FEMA440针对土-结相互作用运动学效应、地基阻尼效应的地震动需求谱修正算法，探讨建立综合考虑桩-土相互作用三种效应的桩基础RC桥梁的抗震性能评估方法。以某高速公路RC连续梁桥为算例，分别以三种设计谱及相应的人工波为输入进行非线性静、动力方法验算对比，两个水准下的计算结果表明本文建议方法在补充考虑后两种效应后，地震响应略小于以考虑第一种效应为主的动力时程法，所建议方法能用于有效评估桩基础桥梁在预期地震需求下的抗震性能。

Abstract

The dynamic interaction of pile-soil-bridge system is the hot spot and challenging scientific question，and the flexible foundation effect and kinematics interaction effect as well as foundation damping effect should be reasonably considered. In this paper, by the introduction of seismic demand spectrum modification algorithm of the kinematics interaction effect and foundation damping effect from FEMA440, a seismic performance evaluation method which could take into account effectively the three kinds SSI effects of Pile-foundation RC Girder Bridges was developed based on nonlinear static analysis method. With a highway RC continuous girder bridge as example, the nonlinear static and dynamic analysis was conducted respectively for the aim of comparison with three kinds of design spectrums and corresponding artificial wave as input. The results of two earthquake levels shows that the seismic response of advised method is slightly smaller than dynamic analysis, and the modified capacity spectrum method can be use in evaluating the seismic performance of pile-foundation bridge under anticipated earthquake demand.

导出引用

江辉;李杰;杨庆山;朱晞;刘林. 考虑SSI三种效应的桩基础RC梁式桥抗震性能评估方法研究[J]. 振动与冲击, 2012, 31(5): 65-72

JIANG Hui;Li Jie;YANG Qing Shan;ZHU Xi;Liu lin. Study of the seismic performance evaluation method for pile-foundation rc girder bridges considering three kind of ssi effects[J]. Journal of Vibration and Shock, 2012, 31(5): 65-72