【作者】 周圣斌；

【导师】 黄熙龄；

【作者基本信息】 中国建筑科学研究院 ， 岩土工程， 2008， 博士

【摘要】 大底盘框架厚筏基础作为地下车库通常布置规则的柱网,而圆形框筒结构主楼荷载在基础和地基上近似于径向传力,两种结构体系并不一致,基础上荷载差异较大,其整体工作性能较为复杂。目前对其研究较少。本文通过室内模型试验和数值计算,对圆形框筒结构主楼和方形主楼布置于同一大底盘框架厚筏基础与地基共同作用问题进行了研究。试验结果表明:圆形框筒结构主楼荷载的有效扩散范围为距主楼外边缘周向一跨,这一区域内筏板的反力和变形较大,同时变形较为均匀,基础反力呈环状向外衰减;对于主楼周向外挑两跨的情况,基础的薄弱部位为主楼角端至基础筏板的角端,呈明显的柔性板特征。本文以最小势能原理为基础,编制了有限压缩层地基上的三维框架-厚筏有限元程序,能够近似的计算竖向荷载作用下局部区域不规则的框架厚筏基础的基底反力和变形。更多还原

【Abstract】 The large-area frame-thick raft foundation as underground garage is usually set as regular column grid, while the circular frame-corewall structure load on the basis and foundation is similar to the spread of radial. Because of variances of the two structural system and great differences between the rigidity and load, working performance of the whole structure is very complicated. So far research on this topic is very rare.This paper researches on the interaction of soil and large-area frame-thick raft foundation under the circular frame-corewall superstructure and square-shape superstructure based on model test and numerical calculation. According to the test result, the effective spreading region of circular frame-corewall load is the annexes region from the superstructure of one span with large contact pressure and homogeneous settlement and the contact pressure attenuates as circle ; The annexes between multi-towers show limited rigidity influenced by multi-towers load ; As frame-thick raft are cantilevered out for two span , the region between the main buildings corner and the raft corner is the weakest part and shows obvious flexible plate characteristics.In this paper, computer program for space frame-thick raft on limited compression soil layer using finite element method was compiled by means of the energy principle and the calculating results are consistent with the test results. The program can be applied to approximately calculate contact pressure and settlement of frame-thick raft foundation under irregular vertical load.更多还原