多塔楼差异沉降下桩筏基础筏板的内力分析

传统意义上桩筏基础筏板的设计计算是采用桩筏分算方法确定筏板的厚度及配筋,没有考虑差异沉降的影响.文章提出了一种新方法,考虑差异沉降对筏板内力的影响,采用有限元分析软件SAP2000建立上部结构-筏板-弹簧支撑的弹性分析模型,根据塔楼和其他部分沉降等值线的比值调整弹簧刚度,通过不断的调整弹簧刚度调整基底的差异沉降,使基底沉降差异控制在0.01m以内.由于减少了基底的差异沉降,使得筏板的内力趋于均匀,从而达到优化筏板设计的目的.

The Raft 's Inner Force Analysis in Multi-tower Enlarged Base Structure under unequal Settlement

In tradition sense,the design and calculation of the raft is based on the method to confirm its thickness and reinforcement by calculating the pile and raft separately,where the effect of unequal settlement is not considered.This article brings forward a new method with considering the effect of the raft's internal force by using finite element analysis software-SAP2000 to set up elasticity analysis model of structure-raft-spring support,according to the ratio of the settlement isolines for the towers and other parts,to adjust unequal settlement of the piled raft foundation by adjusting the stiffness of the spring continuously,to control the difference of the settlement less than 0.01m.Because of the reduction of unequal settlement,the raft's internal force goes to equality,and the raft design is optimized finally.