关于设防烈度地震和罕遇地震下建筑桩基础竖向承载力的探讨
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（奥雅纳工程咨询（上海）有限公司深圳分公司，深圳 518048）[摘要] 基于中震或大震分析的性能化抗震设计逐渐增多，而现行规范仅有非抗震和小震工况的桩基竖向承载力验算规定。为此本文分析了现行规范中桩基竖向承载力验算的安全度，讨论了建筑桩基的抗震设防目标，提出了以“安全系数”为目标的中震、大震下桩基竖向承载力验算简化方法，供进一步研究和探讨。[关键词] 桩基竖向承载力;性能化抗震设计;设防烈度地震;罕遇地震;承载力安全系数中图分类号：TU473.1 文献标识码：A 文章编号：1002-848X(2013)S1-0872-04Discussion on vertical bearing capacity of building pile foundation under fortification or severer earthquakesGu Jinqiang(Shenzhen Branch,Arup International Consultants (Abstract: While performance based seismic design taking into account of fortification or severer earthquake impact, is getting prevalent for large scale or complex building structures, discussion is necessary on how to verify the adequacy of vertical bearing capacity of building pile foundation under fortification or severer earthquakes for such projects, as current codes of practice only provide design guidance on verification of pile bearing capacity under frequent earthquakes. In this paper, provisions of curent codes of practice are reviewed in regard to factor of safety for pile bearing capacity, seismic fortification objectives are discussed for building pile foundations, simplified method with criterion on factor of safety is recommended for justification of vertical bearing capacity of building pile foundation under fortification or severer earthquakes.Keywords: vertical bearing capacity of pile;performance based seismic design;fortification earthquake;severer earthquake;factor of safety for bearing capacity作者简介：古今强，高级工程师，注册土木工程师（岩土），一级注册结构工程师，英联邦结构工程师（MISructE），Email: jin-qiang.gu@arup.com。
