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上海某交通枢纽站以TOD模式建设成为一个地铁上盖综合体。该综合体为层间隔震结构,同时由于该场地涉及多条地铁线和铁路线,情况非常复杂,导致该综合体仅局部可设地下室,局部为独立承台,结构嵌固条件与普通全地下室结构不同,需要验算水平力作用下桩基的承载力。介绍该综合体的桩基水平承载力设计,包括基底剪力在地下室和独立基础之间的分配;比较了《建筑桩基技术规范》(JGJ 94—2008)和上海市地方规范《地基基础设计规范》(DGJ 08-11—2010)对桩基水平承载力的计算方法的异同点,并最终采用《建筑桩基技术规范》(JGJ 94—2008)的计算方法,对基桩进行桩身强度验算。结果表明,桩身内力理论值与试桩结果吻合。同时将与隔震相关构件直接相连的柱下独立基础承台的性能目标提高至中震不屈服。本项目的计算方法可为同类结构提供参考。
A traffic hub in Shanghai TOD mode to build a subway superstructure. The complex is a layer-separated seismic isolation structure. Since the site involves a number of subway lines and railway lines, the situation is very complicated. As a result, the complex may only have a partial basement and a partially independent cap. Different structures require checking the bearing capacity of pile foundation under horizontal force. This paper introduces the design of the pile horizontal bearing capacity of the complex, including the distribution of the base shear between the basement and the independent foundation; compares the technical specifications of the building pile foundation (JGJ 94-2008) and the local code of Shanghai Municipality (DGJ 08-11-2010) on the calculation method of horizontal bearing capacity of pile foundation, and finally using the calculation method of Technical Code for Construction Pile Foundation (JGJ 94-2008), the pile strength Check. The results show that the theoretical value of pile internal force is consistent with that of pile test. At the same time, the performance target of the independent foundation cap under the column which is directly connected with the isolation-related components is increased to no shock under the earthquake. The calculation method of this project can provide reference for the similar structure.