基于结构台阵的多种结构模型的地震影响分析

发布时间：2018-06-02 22:20

本文选题：结构建模 + 土-结构相互作用　；参考：《苏州科技学院》2013年硕士论文

【摘要】：结构计算模型的建立是否合理,将直接影响到结构的抗震分析结果。为了更好地研究结构计算模型对高层建筑结构地震响应数值模拟结果的影响,本文选择了一结构台阵作为研究对象,利用Abaqus有限元软件和2009年姚安地震时得到的该建筑的结构台阵记录,进行了该高层建筑多种模型的时程反应分析,并与实际记录进行了比较。本文的主要工作内容如下：(1)选取云南省人民政府防灾减灾应急指挥中心大楼作为本文的结构原型,分别建立了以刚性地基为假定的二维和三维结构模型,以及考虑土-结构相互作用的三维模型。(2)以姚安地震的地下室加速度记录作为输入,分别对二维和三维结构模型进行时程反应计算,与实际记录的比较结果表明：三维模型的计算结果与实测记录吻合较好,就高层建筑的抗震分析而言,由于结构较复杂,应尽可能采用三维模型,二维模型不足以反映结构的动力特性。(3)根据该大楼的地质勘探资料,假定了水平成层和有倾角成层的两种土介质模型。比较计算结果与结构实测记录发现：有倾角成层土-结构相互作用模型的计算结果与观测记录相比有明显的放大现象,在NS方向体现得更为突出。这说明,就高层建筑的抗震分析而言,土介质模型对计算结果影响很大,在进行土-结构相互作用分析时,土层模型应尽可能与真实土层相符,否则其计算结果会产生较大误差。(4)将刚性地基三维结构模型和考虑土-结构相互作用三维模型的计算结果与结构实测记录对比发现：考虑土-结构相互作用影响更符合实际。
[Abstract]:Whether the structural calculation model is reasonable or not will directly affect the seismic analysis results of the structure. In order to better study the influence of the structural calculation model on the seismic response of high-rise building structures, a structural array is selected as the research object in this paper. Using the finite element software Abaqus and the structural array records of the building obtained from the Yao'an earthquake in 2009, the time-history response analysis of various models of the high-rise building is carried out and compared with the actual records. The main work of this paper is as follows: (1) selecting the Building of the disaster Prevention and Mitigation and Emergency Command Center of the Yunnan Provincial people's Government as the structural prototype of this paper, the 2D and 3D structural models assumed by the rigid foundation are established, respectively. Taking the acceleration records of the basement of Yao'an earthquake as input, the time-history responses of two-dimensional and three-dimensional structural models are calculated, respectively. The results of comparison with the actual records show that the calculated results of the 3D model are in good agreement with the measured data. As far as seismic analysis of high-rise buildings is concerned, the three-dimensional model should be used as far as possible because of the complexity of the structure. The two-dimensional model is not sufficient to reflect the dynamic characteristics of the structure. (3) based on the geological exploration data of the building, two soil media models, horizontal stratification and inclined stratification, are assumed. Comparing the calculated results with the measured data, it is found that the calculated results of the laminated soil-structure interaction model with dip angle have obvious magnification phenomenon compared with the observed data, and are more prominent in NS direction. This shows that the soil media model has a great influence on the calculation results for the seismic analysis of high-rise buildings. In the analysis of soil-structure interaction, the soil layer model should be consistent with the real soil layer as much as possible. Otherwise, the result of calculation will cause a big error. (4) comparing the calculation results of 3D structural model of rigid foundation with that of three-dimensional model considering soil-structure interaction with the measured data of structure, it is found that considering the influence of soil-structure interaction is more in line with the reality.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU435

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