某高层建筑上部结构与地基基础共同作用的分析研究

发布时间：2018-08-16 12:25

【摘要】：城市化进程不断加快和土地资源日益紧缺,促使了我国高层建筑的出现和发展。传统的设计方法即设计人员常用的设计方法是将上部结构、基础和地基隔离开来分别考虑,但这种方法忽视了三者共同作用的影响,其计算结果与实际工程的受力状态有较大的不同,在高层建筑中这种不合理的现象尤为明显。本文以实际高层建筑——西安市某大底盘三塔楼结构为研究对象,根据共同作用的基本原理和分析方法,以粘弹性人工边界模拟对来自广义结构的外行散射波的吸收,采用等效复合体模型将群桩基础的桩—土复合部分等效成横观各向同性体,并结合工程地质资料确定相关的计算参数。然后,运用大型有限元软件Midas/Gen分别建立相应的计算模型,进行是否考虑共同作用下结构地震响应及施工阶段受力分析的差异研究。本文的研究内容和主要结论如下:(1)对刚性地基有限元模型进行两个方向的静力弹塑性分析,研究本案例中的大底盘三塔楼结构塑性铰发展状态,探明结构的薄弱层,分析结构在罕遇地震作用下的内力及变形;(2)通过与刚性地基模型下结构的计算结果对比,分析了SSI效应对结构地震响应的影响,得出结构底部剪力、顶点加速度等参数的变化规律;(3)对结构的薄弱层进行地震反应分析,得出薄弱层在考虑共同作用后内力的变化规律;(4)探讨结构在施工阶段的受力状态,得出结论:与刚性地基模型相比,在考虑共同作用后,结构的内力发生重分布,出现边柱加载而中柱卸载的现象。
[Abstract]:The process of urbanization and the shortage of land resources promote the appearance and development of high-rise buildings in China. The traditional design method, the design method commonly used by designers, is to separate the superstructure, foundation and foundation separately, but this method ignores the influence of the three factors. The calculation results are quite different from the actual engineering stress state, especially in the high-rise building. In this paper, based on the basic principle and analytical method of the interaction, the absorption of the scattering waves from the generalized structure is simulated by the viscoelastic artificial boundary, taking the structure of a large chassis three towers in Xi'an city as the research object, and using the viscoelastic artificial boundary to simulate the absorption of the scattering waves from the generalized structure. The pile-soil composite part of pile group foundation is equivalent to transversely isotropic body by using equivalent complex model, and the relevant calculation parameters are determined with engineering geological data. Then, using the large-scale finite element software Midas/Gen, the corresponding calculation models are established, and the difference between the seismic response of the structure and the stress analysis in the construction stage is studied whether or not the joint action is taken into account. The contents and main conclusions of this paper are as follows: (1) the static elastoplastic analysis of the finite element model of rigid foundation is carried out in two directions, and the development state of plastic hinge of the three-tower structure with large chassis in this case is studied, and the weak layer of the structure is proved. The internal force and deformation of the structure under the rare earthquake are analyzed. (2) by comparing with the calculation results of the rigid foundation model, the influence of SSI effect on the seismic response of the structure is analyzed, and the shear force at the bottom of the structure is obtained. (3) the seismic response analysis of the weak layer of the structure is carried out, and the variation law of the internal force of the weak layer after considering the joint action is obtained; (4) the stress state of the structure in the construction stage is discussed. It is concluded that compared with the rigid foundation model, the internal force of the structure redistributes after considering the joint action, and the phenomenon of loading the side column and unloading the middle column occurs.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU973.2;TU470

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