同济大学学报（自然科学版）2024，Vol.52Issue(6)：893-901,9.DOI:10.11908/j.issn.0253-374x.22313
砂土场地桥梁群桩基础延性抗震性能分析
Ductile Seismic Performance Analysis of Bridge Pile-group Foundations in Sand
摘要
Abstract
In this paper,the rigorous incremental dynamic analysis(IDA)method is employed to systematically investigate the ductile seismic performance of pile-group foundations(PGFs).A shake-table test on the pier-PGF system in sand is firstly used to validate the numerical modelling technique.Based on the engineering practice,a series of analytical models are then established considering the variation of nine structural/geotechnical parameters.Seven ground motion records are selected for the implementation of IDA.Finally,the seismic failure process of PGFs is validated and three performance indicators in terms of displacement,rotation and strength are proposed.And the impact of each parameter on the proposed performance index is investigated.It is found that for PGFs in the easy-to-repair state,the average displacement ductility is 2.52 and the average lateral strength is 1.41 times of that of the first-yield state.The average ultimate displacement ductility of PGFs is 3.62 and the average ultimate lateral strength is 1.47 times of that of the first-yield state.The maximum drift ratio of the pier induced by pile-cap rotation is less than 0.7％.关键词
群桩基础/延性性能/增量动力分析/位移延性/水平承载力/承台转角Key words
pile-group foundations(PGFs)/ductile performance/incremental dynamic analysis(IDA)/displacement ductility/lateral strength/pile-cap rotation分类
交通工程引用本文复制引用
王靖程,叶爱君,王晓伟..砂土场地桥梁群桩基础延性抗震性能分析[J].同济大学学报（自然科学版）,2024,52(6):893-901,9.基金项目
国家自然科学基金(52178155) （52178155）
土木工程防灾国家重点实验室自主研究课题基金(SLDRCE19-B-20) （SLDRCE19-B-20）
