双塔裙房一体的大底盘变厚度筏形基础变形特征
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(1 北京市建筑设计研究院，北京 100045； 2 北京市勘察设计研究院有限公司，北京 100038)［摘要］大底盘厚筏基础是通过扩大的地下结构，将地面上不同建筑单元连成一体的筏板基础。通过北京LG大厦基础设计、沉降观测以及反演，分析了并列式双塔裙房一体的大底盘变厚度筏形基础的变形特征。此类基础的纵向整体变形曲线虽呈连续的多波状，但塔楼下基础整体变形曲线仍呈盘状，在形状上与一般单幢建筑物并无差异。与塔楼连成一体的扩大了的地下结构，在一定范围内具有分担部分塔楼竖向荷载的能力，但也会引起基础偏心使基础出现整体倾斜。强调地下室框架结构及楼板参与工作对减小塔楼下大底盘基础的整体挠曲度有重要影响。［关键词］大底盘厚筏基础；并列双塔；裙房；变形特征Deformation behavior of large plinth of raft foundation with variable thickness under twin towers with podium in parallelHou Guangyu1，Chen Binlei1，Shen Bin2，Tang Jianhua2(1 Beijing Institute of Architectural Design,Beijing 100045，China; 2 BGI Engineering Consultants Ltd.,Beijing 100038,China)Abstract:The large plinth of thick raft foundation refers to the raft foundation which links several separate architectural units above the ground as a whole by extended substructure.The deformation behavior of such a raft foundation is presented with variable thickness under twin towers with podium in parallel through the foundation design, settlement observation and back analysis of Beijing LG Building. The overall longitudinal deformation curve of such kind foundation is a multi-wave profile, but the deformation curve under the tower still emerges as sagging which has no difference with individual tower except the amount of settlement. The extended substructure that links the tower as a whole shares part of vertical loads of the tower within a certain range, but it could cause general incline due to foundation eccentricity. The study emphasizes the interaction of basement frame-structure，including the underground floor slab which has significant effects to minimize the deflection ratio of the large plinth of raft foundation under tower.Keywords:large plinth of thick raft foundation； twin towers in parallel； podium； deformation behavior作者简介：侯光瑜，教授级高工，Email：hou1934@yahoo.cn。参考文献［1］侯光瑜，陈彬磊，苗启松，等. 钢-混凝土组合框架-核心筒结构设计研究［J］. 建筑结构学报,2006，27(2):1-9.［2］北京市勘察设计研究院. 岩土勘察报告［R］.2001.［3］北京市勘察设计研究院. 北京LG大厦工程地基与基础协同作用计算分析报告［R］.2001.［4］GB50007—2002建筑地基基础设计规范［S］.北京：中国建筑工业出版社，2002.［5］中兵勘察设计研究院. 北京LG大厦沉降观测报告［R］.2007.［6］黄熙龄.高层建筑厚筏反力及变形特征试验研究［J］.岩土工程学报，2002,24(2):131-136.［7］宫剑飞，黄熙龄，滕延京，等. 多栋塔楼作用下大底盘框架厚筏基础结构分析与设计［R］.北京：中国建筑科学研究院，2004.［8］JGJ6—99高层建筑箱形与筏形基础技术规范［S］.北京：中国建筑工业出版社，1999.
