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某TOD地铁上盖建筑桩基水平承载力设计
樊长龙,史华燕,来少平,朱立刚,梁金桐
摘 要

(奥雅纳工程顾问,上海 200031)

[摘要]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。

[关键词]嵌固不连续; 隔震结构; 桩基水平承载力; m值法

中图分类号:TU318+.2文献标识码:A文章编号:1002-848X(2017)14-0100-06

 

Horizontal bearing capacity design of the pile foundation  of a TOD top-head platform building over subway 

Fan Changlong, Shi Huayan, Lai Shaoping, Zhu Ligang, Luo Andrew

(Arup, Shanghai 200031, China)

Abstract:A traffic hub station in Shanghai is built into a top-head platform building over subway in TOD mode. The complex building adopts interlayer isolation structure. The site involves many subway and railway lines, so the site condition is very complex, which leads to that the complex can only set basement partially and independent cushion cap partially. The structure embedment conditions are different from general integral basement structure, and it needs checking the bearing capacity of pile foundation under horizontal force. The design of the complex building′s pile foundation for horizontal force resistance was introduced, including the distribution of base shear between the basement and the independent foundation. The similarities and differences of methods in Technical code for building pile foundation (JGJ 94—2008) and Shanghai local code Foundation design code (DGJ 08-11—2010) to calculate the horizontal bearing capacity of the pile foundation were compared, and finally the method in former code was adopted to check the strength of pile foundation. The results show that the theoretical value of the pile internal force coincides with the pile test results. At the same time, the performance goal of the cushion cap of independent foundation under the column, which was directly connected with the seismically isolated members, was increased to the non-yielding under the fortification earthquake. The calculation method of this project can provide  reference for similar structures.

Keywords:discontinuity of embedment;  isolation structure; horizontal bearing capacity of pile foundation; m\|value method

 

作者简介:樊长龙,硕士,高级工程师,一级注册结构工程师,一级注册土木工程师(岩土),Email:chang-long.fan@arup.com。

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