高层建筑筏形基础内力的有限元法计算研究

目前筏形基础内力计算主要利用有限元法。从理论上讲，有限元网格划分愈细，计算精度愈高。但由于筏形基础计算模型中将柱、墙与筏板连接处简化为点支承、线支承，故网格划分愈细，集中荷载处内力愈趋近于理论解的无穷大值，这与实际情况内力的有限值严重不符。通过工程实例，研究了有限元网格密度对筏板内力计算的影响，提出了有限元网格尺寸的适宜大小选取原则。

Research on the calculation of raft foundation internal force of the high building

This paper takes a high building in Deyang as an example to study the influence of finite element mesh division on the internal force. Using the common software JCCAD to make a basic design, the author calculates the raft foundation internal force with different mesh division, and quantitatively analyzes the difference between the results. Based on this, the author uses the international software ANSYS and MARC to do the raft board internal force calculation. The author compares the different results, then reaches a conclusion that the mesh should be the same or the twice thickness of the side length or the 1/3 -1/4 of the span.