基础宽高比对扩展基础基底压力分布影响规律数值模拟

摘要

The contact pressure distribution of spread foundation is a classic problem for the research on the interaction between foundation and ground,the design codes assume that the distribution is linearin generalwhen the foundation's width-to-height ratio is smaller than 2.5 at home and abroad.However many scholars' tests and theories show that the contact pressure is not even or linearly distributedactually.This paper uses the finite element analysis software ABAQUS to do the numerical simulations,and then comparing experiments with simulation results and exploring the contact pressure distribution of the different foundation's width-to-height ratio under the design load.The results show that,with the increase of the foundation's width to-height ratio,the stiffness of the foundation changes from rigidity to flexibility,and its contact pressure distribution becomes complicated and tends to focus on the middle part.%扩展基础的基底压力分布是地基基础共同作用分析的经典问题,在国内外的设计规范中,对于基础宽高比小于或等于2.5的情况,通常假定基底压力为直线分布形式.然而,已有研究表明,扩展基础基底压力实际分布型式与直线型假定相去甚远.采用ABAQUS有限元软件建模,并将数值模拟和已有试验结果进行对比分析,探究设计荷载下不同宽高比基础的基底压力分布模式,分析表明,随着基础宽高比的增大,刚性基础变为柔性基础,其基底压力分布逐渐变复杂,呈向中间部位集中趋势.