高层建筑框架—核心筒混合结构双向地震反应研究

发布时间：2018-01-19 07:40

本文关键词： 框架-核心筒双向地震作用纤维模型弹性时程分析弹塑性时程分析地震能量反应　出处：《西安建筑科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：随着抗震事业的不断发展，人们逐渐认识到地震时的地面运动和结构的作用效应均是多维的，而且地震动记录本身也存在六个方向的运动分量。由于认识水平和技术手段的限制，在对结构进行动力分析时，研究者们大多采用平面分析模型，研究单向地震作用下结构的相关特性，忽略了双向水平地震作用的影响。实际上，无论结构是否规则，结构在双向地震作用下的作用效应较单向作用下的均有一定的提高，，为了较全面真实地反映结构在地震作用下的反应规律，应考虑多维地震作用的影响。本文借助三维结构分析软件Perform-3D，对框架-核心筒混合结构在多遇地震和罕遇地震作用下进行动力时程分析，研究结构在单、双向地震作用下的反应规律。采用“2+1”的输入方式，输入不同的地震动记录，进行单、双向地震作用下的弹性阶段和弹塑性阶段的动力时程分析，其中弹性阶段以构件内力为主要研究对象，进行单、双向地震作用的最大效应比，双向地震作用最大效应与SRSS组合值的比值等的大量统计分析，对我国抗震规范给出的组合公式加以修改，以便更好的用于抗震设计；在弹塑性阶段，以顶点最大位移为标准值提取双向地震的最不利输入方向，重点研究结构在单向与最不利输入角度情况下的双向地震作用下结构的顶层位移时程、楼层位移和层间位移角、层剪力、扭转角等效应的反应规律；同时考察罕遇地震作用下不同角度输入情况时，结构顶点位移的变化规律，以及结构在单、双向地震作用下的耗能情况。
[Abstract]:With the continuous development of seismic cause, people gradually realize that the ground motion and the effect of structure are multidimensional. Because of the limitation of cognition level and technical means, most of the researchers use plane analysis model in the dynamic analysis of the structure. In order to study the related characteristics of structures under unidirectional earthquake, the effect of bi-directional horizontal seismic action is ignored. In fact, whether the structure is regular or not. The action effect of structure under the action of bidirectional earthquake is higher than that under unidirectional action. In order to reflect the response law of structure under earthquake, the effect of multi-dimensional earthquake should be considered. In this paper, with the help of three-dimensional structure analysis software Perform-3D, dynamic time-history analysis of frame-core-tube hybrid structures under frequent and rare earthquakes is carried out, and the structure is studied in a single structure. The dynamic time history analysis of elastic stage and elastoplastic stage under the action of single or double direction earthquake is carried out by inputting different ground motion records in "21" input mode. In the elastic stage, taking the internal force of the component as the main research object, a large number of statistical analysis is carried out on the ratio of the maximum effect of single and bidirectional earthquakes, the ratio of the maximum effect of bidirectional seismic action to the combined value of SRSS, etc. In order to be better used in seismic design, the combination formula given in the seismic code of our country is modified. In the elastoplastic stage, the maximum displacement of the vertex is taken as the standard value to extract the most unfavorable input direction of the bi-directional earthquake. The response law of the top floor displacement, floor displacement and interstory displacement angle, story shear force and torsion angle of the structure under the action of bidirectional earthquake under unidirectional and most unfavorable input angle is studied emphatically. At the same time, the variation law of the structural vertex displacement and the energy dissipation of the structure under the action of single and bidirectional earthquakes are investigated under the action of rare earthquakes at different angles.
【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】：2013
【分类号】：TU973.31

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