某大底盘双塔楼结构考虑地基-基础-上部结构共同作用变形分析  

Deformation Analysis on a Twin-tower Building with a Large Chassis Under the Interaction of Soil-Foundation-Superstructure

作　　者：王江龙 高扬[1] 赵冬 王丽梅[1] 张晨 Wang Jianglong;Gao Yang;Zhao Dong;Wang Limei;Zhang Chen(Gansu Institute of Architectural Design and Research Co.,Ltd.,Lanzhou 730030,China;Department of Engineering Mechanics,Xi'an University of Architecture and Technology,710055,China)

机构地区：[1]甘肃省建筑设计研究院有限公司,兰州730030 [2]西安建筑科技大学工程力学系,710055

出　　处：《特种结构》2022年第5期89-94,共6页Special Structures

基　　金：国家自然科学基金青年科学基金项目(52008332);地震联合基金项目(U1939209);甘肃省建筑设计研究院有限公司科技研发项目(KY2022-JG02)。

摘　　要：复合地基在设计中需要考虑地基和基础及上部结构的共同作用,传统的共同作用分析是将上部结构、基础、地基三者分离开来计算,这种计算模式忽略了三者之间的变形协调。本文首先根据弹性地基上扁球壳实用解答的基本方程,分析了地基-基础-上部结构共同作用变形计算的影响因素;然后结合某大底盘双塔楼复杂高层建筑采用刚性桩复合地基,对上部结构分别按照考虑与不考虑基础结构的影响进行计算分析,并对比了上部结构的整体变形计算指标;最后对建筑物进行地基基础的变形验算,并和变形实测值进行了对比分析。结果表明,考虑地基-结构共同作用后,上部结构基本自振周期延长,结构的变形显著增大,刚重比相应减小;通过变基床系数法使地基基础变形与沉降计算数值基本一致(变形协调),且变形计算值和实测值基本一致。The composite rigid pile foundation is used for the foundation of complex high-rise twin-tower buildings with large chassis,and the interaction of soil-foundation-superstructure should be considered in the foundation design.The traditional interaction analysis is to calculate the superstructure,foundation,and soil separately,and this calculation method disregards the deformation coordination among the three.In this paper,according to the basic equation of the oblate spherical shell on elastic foundation,the influence factors on deformation under the interaction of soil-foundation-superstructure are firstly analyzed;Then taking an actual complex twin-tower high-rise building with a large chassis on composite rigid pile foundation as study object,the superstructure with and without the influence of the foundation structure is calculated,and the overall superstructure deformations are compared;Finally,the deformation of the building foundation is checked and compared with the deformation measured on site.The results show that when the soil-foundation-superstructure interaction is considered,the basic natural vibration period of the superstructure is prolonged,the deformation of the structure is significantly increased,and the ratio of rigidity-to-gravity is correspondingly decreased;The deformation of foundation is generally consistent with the calculated settlement(deformation coordination),and the calculated deformation is consistent with the settlement measured on site.

关 键 词：大底盘双塔楼结构 地基-结构相互作用 变形分析 刚性桩复合地基 基床系数 

分 类 号：TU47[建筑科学—结构工程] TU973.3[建筑科学—土工工程]