基于PLAXIS3D的地基基础-上部结构共同作用分析

发布时间：2018-12-13 23:17

【摘要】：以某多层框架结构为工程背景,通过PLAXIS 3D有限元程序构建包含上部结构与地基基础的三维数值模型,借助程序内嵌的弹塑性分析功能;首先,采用SAP2000建立结构有限元模型,在PLAXIS 3D中采用与其相同的底部约束条件,对比仅考虑自重作用时两模型中结构内力的差异,验证PLAXIS 3D进行框架结构内力分析的计算精度;然后,分别考虑小震与大震两种工况,采用拟静力方法,对结构施加水平地震力,研究土-结构共同作用下结构内力与不考虑共同作用时结构内力的差异性;最后,除PLAXIS3D整体模型之外,考虑将上部结构简化为均布荷载,分析两种情况下基础沉降的差异性。结果表明,建立土体与结构的整体三维模型可以直接考虑地基基础与上部结构的刚度协调,从而获得更加符合实际的结构内力和基础变形。
[Abstract]:Taking a multi-story frame structure as the engineering background, the three-dimensional numerical model including superstructure and foundation is constructed by PLAXIS 3D finite element program, and the function of elastic-plastic analysis embedded in the program is used. Firstly, the finite element model of structure is established by SAP2000, and the same bottom constraint condition is adopted in PLAXIS 3D. The calculation accuracy of internal force analysis of frame structure is verified by comparing the difference of internal force between the two models when considering the self-weight action only, so as to verify the calculation accuracy of the internal force analysis of frame structure by PLAXIS 3D. Then, considering the two working conditions of small earthquake and large earthquake, applying the horizontal seismic force to the structure by quasi-static method, the difference between the structure internal force under the soil-structure interaction and the structure internal force when the interaction is not considered is studied. Finally, in addition to the PLAXIS3D integral model, considering the superstructure as uniform load, the difference of foundation settlement is analyzed. The results show that the stiffness coordination between the foundation and the superstructure can be considered directly by establishing the whole three-dimensional model of soil and structure, so that the internal force and deformation of the structure can be obtained more in line with the actual situation.
【作者单位】：北京金土木信息技术有限公司;
【分类号】：TU470

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