桩筏基础在上下部共同作用下的极限分析

LIMIT ANALYSIS OF PILE-RAFT FOUNDATION ON INTERACTION BETWEEN SUPERSTRUCTURE AND BASE

桩筏基础是目前高层建筑最常用的基础形式，在上下部共同作用下，桩筏基础的内力分析目前通常限于弹性分析范畴。本文视桩基、筏板和上部结构为整体，从能量原理出发，引进上下部同步破坏优化设计准则，建立了一套桩筏基础在考虑上下部共同作用下的极限分析计算方法，并通过二个桩筏工程的极限分析以及实测对比，说明本文方法的合理性与可靠性。

Pile-Raft foundation is widely used in high buildingr. But the analysis of intemal force of pile-raft foundation relatal to the interaction between superstrucbe and base is lindted in elastic theory rang. Based on the principle of virtual work and introducing the optimal criterion of simultaneous damage, the interaction between supersmicbe and base has bo studied with the limit analsis method developed. The limit analysis of two actual pile-ed foundaions is made in order to veap the suggested method. In comparison with the actual measuremnt, the results obtained in this paper are proved to be rational and reliable.