超高层筒中筒结构桩筏基础共同作用现场实测与数值分析  

FIELD TEST AND NUMERICAL ANALYSIS OF INTERACTION OF PILE-RAFT FOUNDATION ULTRA-HIGH TUBE-IN-TUBE STRUCTURE

作　　者：王莺歌[1] 

机构地区：[1]嘉应学院土木工程系,梅州514015

出　　处：《工业建筑》2005年第5期10-15,共6页Industrial Construction

摘　　要：通过对陕西省邮政电信网管中心大楼桩筏基础的沉降观测及反力的部分现场实测结果的分析,利用大型有限元软件ANSYS ,地基土采用弹塑性本构关系,筏板采用中厚板理论,建立了超高层筒中筒结构、桩筏基础和地基土的三维有限元模型,进行了三者在竖向荷载作用下共同作用的非线性数值分析,对黄土地区超高层建筑桩筏基础的沉降、受力和桩土分担比进行了探讨。分析表明:基础沉降、桩土荷载分担比等实测结果与数值分析吻合较好,在黄土地区建设超高层建筑采用超长灌注桩对于减小基础沉降有显著效果;筒体结构对基础刚度贡献的影响范围约为8层;筏板内力分布复杂,与上部结构形式和布桩方式等因素密切相关,且筏板悬挑端部弯矩很大。Through analysis of field test results drawn from pile-raft foundation settlement and reaction force of Shaanxi Postal Telecommunication Net Centre Building,a three-dimensional finite element model of ultra-high tube-in-tube structure,pile-raft foundation and subsoil is established by use of large-scale finite element software ANSYS,elastoplastic constitutive relation and medium plate theory;and non-linear numerical interaction analysis of the three under vertical loadis also done.Observed data of foundation settlement,proportion of pile to soilshare,etc.correspond well with those of numerical analysis.Further,pile-raft foundation settlement,force receiving and proportion of pile-soil share of ultra-high building in loess area are discussed.The analysis results indicate:adoption of super-lengthy perfusion pile has remarkable effect to decrease settlement in loess area,tube structure′s contribution to foundation rigidity ranges about 8 floors,which can reduce foundation differential settlement,the internal force distribution of the raft is very complicated,which is closely related with such factors as superstructure forms,piling arrangement and so on,moreover,the curving moment at raft′s cantilever end is awfully great.

关 键 词：超高层建筑 筒中筒结构 桩筏基础 共同作用 现场实测 数值分析 

分 类 号：TU473.1[建筑科学—结构工程]