| 基于Pushover分析的群桩基础抗震性能分析方法 |
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| 引用本文： | 叶爱君,鲁传安.基于Pushover分析的群桩基础抗震性能分析方法[J].土木工程学报,2010(2). |
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| 作者姓名： | 叶爱君 鲁传安 |
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| 作者单位： | 同济大学土木工程防灾国家重点实验室;上海市隧道工程轨道交通设计研究院; |
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| 基金项目： | 国家自然科学基金项目(50878147) |
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| 摘 要： | 把桥梁群桩基础作为一个整体构件,基于Pushover分析,提出群桩基础的抗震性能分析方法,建立承台底荷载模型和非线性群桩基础结构模型(弹塑性桩身模型、非线性边界条件),并提出衡量群桩基础抗震性能的双指标(位移延性系数和抗力增大系数)。根据这一方法,选取一个实际的桥梁群桩基础作为背景建立群桩基础的非线性结构模型以及一系列的荷载工况,计算各种荷载水平对应的群桩基础推倒曲线,并采用本文建议的位移延性系数和抗力增大系数进行抗震性能评价。结果表明:承台底的轴力和弯矩水平虽然对群桩基础的屈服状态和极限状态对应的水平力和位移有显著影响,但对整体抗震性能指标影响很小;在各种荷载水平下,群桩基础的位移延性系数和抗力增大系数都较小。
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| 关 键 词： | 群桩基础 抗震性能 Pushover分析 荷载模型 位移延性系数 抗力增大系数 |
A seismic performance analysis approach based on Pushover analysis for group pile foundations |
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| Ye Aijun Lu Chuan\'an.A seismic performance analysis approach based on Pushover analysis for group pile foundations[J].China Civil Engineering Journal,2010(2). |
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| Authors: | Ye Aijun Lu Chuan\'an |
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| Affiliation: | Ye Aijun1 Lu Chuan\'an2(1. State Key Laboratory for Disaster Reduction of Civil Engineering,Tongji University,Shanghai 200092,China,2. Shanghai Tunnel Engineering & Rail Transit Design , Research Institute,Shanghai 200070,China) |
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| Abstract: | Treating a group pile foundation as one entity component,an approach of seismic performance analysis for group pile foundations was developed,based on Pushover analysis. A load model and a nonlinear structure model (inelastic pile model and nonlinear boundary condition) for group pile foundations were established,and two specific seismic performance indices,displacement ductility factor and resistance amplification factor,were proposed. The seismic performance analysis of a real group pile foundation was co... |
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| Keywords: | group pile foundation seismic performance Pushover analysis load model displacement ductility factor resistance amplification factor |
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