Design and in-situ testing analysis of contact pressure for large-area thick raft foundation under multi-tower buildings

GONG Jian-fei; ZHU Hong-bo; SHI Jin-long; XIE Gao-yuan; DI Dao-huai; ZHOU Sheng-bin

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Design and in-situ testing analysis of contact pressure for large-area thick raft foundation under multi-tower buildings

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- Design and in-situ testing analysis of contact pressure for large-area thick raft foundation under multi-tower buildings
- Vol. 32, Issue S2, (2011)
- 作者机构：
  
  1. 中国建筑科学研究院,北京,100013
  2. 中国建筑科学研究院建筑安全与环境国家重点实验室,北京,100013
  3. 中国电子工程设计院,北京,100840
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU471
- Online First：26 August 2011，
  
  Published：2011
- 稿件说明：
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GONG Jian-fei, ZHU Hong-bo, SHI Jin-long, et al. Design and in-situ testing analysis of contact pressure for large-area thick raft foundation under multi-tower buildings[J]. 2011, 32(S2).
DOI：

GONG Jian-fei, ZHU Hong-bo, SHI Jin-long, et al. Design and in-situ testing analysis of contact pressure for large-area thick raft foundation under multi-tower buildings[J]. 2011, 32(S2). DOI：

摘要

多个塔楼下整体大面积筏板基础反力分布特征仅局限于室内模型试验资料。通过北京三里屯SOHO工程地基反力原位测试并与已有模型试验数据对比分析，结果表明，当地基土比较均匀、上部结构刚度较好，高层外框柱荷载及柱间距的变化不超过20%，核心筒荷载与高层外框柱总荷载相差不超过10%，且筏板厚度超过1/6柱跨时，计算高层下筏形基础的内力时，基底反力可按直线分布；裙房基础可有限扩散高层建筑荷载，实际工程的原位测试结果表明，高层荷载的扩散范围约为2跨裙房的距离，3跨裙房之外没有影响；对于多个高层建筑下整体大面积筏板基础的地基反力可应用叠加原理计算

Abstract

The distribution characteristic of contact pressure of large-area thick raft foundation under multi-tower buildings is always limited to indoor test analysis. This paper comparatively analyzes the in-situ test data from outdoor SOHO project located in Sanlitun

Beijing and the existed indoor test data. The results indicate that when the foundation soil of buildings is uniform distribution

the stiffness of upside structure is greater and the variation between intercolumniation and the load of outer column of frame is not over than 20 percentage as well as the load difference between the outer columns of frame and core-tube less than 10 percentage

when the ratio of the raft thickness to the column span is larger than 1/6

the calculation of contact pressure of raft foundation under tower buildings can be regarded as linear distribution and the load of tower buildings can be diffused by the annex foundation. The situ test in engineering practice indicates

the diffuse range of the load of tall buildings is around two spans of annex

the diffusing effect is rare over than three spans. The principle of superposition can be applied to calculate contact pressure of large-area thick raft foundation in multi-tower buildings

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