分析高层建筑密肋片筏基础的等代有限元方法

The Equivalent-FEM for Analyzing Raft Foundation with Closely-Distributed -Beams

本文应用等代有限元方法分析了高层建筑下的密肋片筏基础．对该基础形式首先化为等代厚度板，然后应用八结点等参单元有限元法和链杆法求得基底接触应力和各单元节点位移，据此利用形函数的特性可求得单元内任一点的位移，特别是欲求内力的任一肋梁的两端点位移，利用肋梁单刚可得其内力，用于工程配筋，工程应用表明，本法具有适用性广，便于实现，解题效率高等优点．

In this paper,a new method,called equivalent FEM, is used to analyze tall building raft foundation with closely distributed beams. The raft is regarded as a plate with equal thickness and analyzed by FEM and rigid-bar method.The internal forces of the sub-plates and beam in a plate element are obtained by multiplying the corresponding displacements with their element stiffness.