By using finite element method,spreading foundation's shear performance on rock foundation is dis-covered on the different stiffness ratios and span-height ratios. It is found that the maximum shear position of the base section is located at the intersection between the column and the foundation. The distribution of the base reac-tion force presents the characteristics of the bottom center reaction force larger base edge reaction force smaller when the stiffness ratio is higher,and the lower the span-height ratio is,the more the base reaction force spread toward the base. Comparing with shear force calculation results by normal method under different circumstance, the rules of spreading foundation's shear performance on rock foundation under different stiffness ratio and span-height ratio are summarized. The formula of shear failure value is deduced by simulation analysis results.%通过有限元数值模拟,研究不同刚度比、跨高比情况下,岩基上扩展基础的剪力分布情况.发现基础截面剪力最大位置位于柱与基础交接处所在截面,且刚度比越大,基底反力分布呈现基础底部中心反力大、基础边缘反力小的特点越加突出;跨高比越小,基底反力越向基底四周扩散.同时将不同情况下的剪力与规范法剪力计算结果进行对比分析,总结刚度比、跨高比对岩基上扩展基础抗剪性能的影响规律;并通过模拟结果推导了抗剪破坏值公式.
展开▼
