【作者】 庞伟聪；

【导师】 张保印；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2003， 硕士

【摘要】 本文采用有限元法分析计算了超高层筒中筒结构桩土的共同工作。地基土采用分层地基模型，桩土界面采用接触单元处理，上部结构采用子结构法处理。对竖向荷载作用下的空间筒中筒结构、桩筏基础和地基进行了三维有限元分析。研究整体结构和单片墙结构在上部结构刚度、桩端土强度、桩长、桩径、桩距、筏板厚度、筏板外挑宽度等影响因素变化时的桩顶反力分布规律、桩筏荷载分担比、桩基沉降和差异沉降规律。同时，结合现场原位实测研究及分析，进行了理论计算结果与现场实测结果的对比以及整体结构和单片墙结构共同工作性状的对比。本文提出了外疏内密的布桩方法和沉降控制优化方法，并就常规桩筏基础设计提出建议以及给出了桩筏荷载分担比计算公式。更多还原

【Abstract】 In this paper, the finite element method is used for the analysis and computation of interaction between pile and soil in super-highrise frame-tube. By adopting the layering foundation model, the contact element and the substructure method, the three-dimensional finite element analysis for soil, pile-raft foundation and frame-tube applied by the vertical loads is established. The regularities of pile-top reaction distribution, the carrying load ratio between pile and raft, the settlement and the imparity settlement of foundation in the frame-tube structure and the single wall are influenced by some factors such as the stiffness of the superstructure, the intensity of the soil under the piles, the length and radius of the piles, the distance between the piles, the thickness and the suspended width of the raft. At the same time, in coordination with the analysis and the study based on the test on site, the comparison of theory result with field measurements has been taken, as well as the comparison of frame-tube with single wall interaction behaviors. In this paper, the allocation mode of the piles, that is sparse in the exterior and dense in the interior, and the optimized method based on the settlement control are proposed. Suggestions in ordinary methods of pile-raft foundation design and formula of the carrying load ratio between pile and soil are put forward.更多还原