防震缝的设置对L形平面不规则RC框架抗震性能的影响

发布时间：2018-02-07 14:07

本文关键词： 平面不规则结构防震缝时程分析自振周期层间位移角地震波　出处：《长沙理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：由于建筑场地的限制、功能和建筑形式的美观要求，建筑的平面布置不可避免的形成不规则形状。在实际工程中对于平面不规则结构的处理方法通常是设置防震缝将其划分成几个较规则的单元结构。可是在历次地震灾害中，防震缝的设置引起的灾害屡见不鲜，特别是中国发生时间最近的一次汶川大地震的震害启发我们思考：防震缝的设置对结构抗震性能有何影响。目前，对防震缝的研究不多且尚浅，仅仅局限于对防震缝的理论分析，还有一些学者从具体工程实例出发探讨防震缝的设置对结构的影响。本文采用弹性动力时程分析方法对不同抗震设防烈度、不同不规则平面形式、不同层高的设置防震缝与不设置防震缝的算例模型进行比较，分析防震缝的设置对RC框架抗震性能的影响。因此，本文的研究内容具有重要的理论意义和实际工程价值。论文首先介绍了国内外对平面不规则结构的定义以及对防震缝宽度的规定，，综述了我国规范对防震缝规定的进展以及对确定防震缝宽度的研究概况，通过分析指出防震缝的利与弊以及防震缝宽度的影响因素。在综述了地震作用的计算分析方法和不规则建筑的抗震设计方法的基础上，利用MIDAS/GEN有限元分析程序，采用反应谱分析方法以及弹性时程分析方法对所选的算例模型进行计算分析。在综述地震动的三要素以及地震波的选择方法的基础上，确定选用El Centro波、Northridge波、Sanfernado波分别从X方向和Y方向对算例模型进行激励。分析比较三条地震波两个方向作用下算例模型的自振周期、层间位移角、钢筋用量三个指标的结果，得出以下结论：①平面凹进尺寸与相应投影方向总尺寸之比小于0.3时，5层、8层、10层、13层设缝结构的层间位移角较不设缝结构的层间位移角大。②平面凹进尺寸与相应投影方向总尺寸之比大于0.3时，5层设缝结构的层间位移角小于不设缝结构的层间位移角。③平面凹进尺寸与相应投影方向总尺寸之比大于0.3时，8层、10层、13层设缝结构的层间位移角大于不设缝结构的层间位移角。
[Abstract]:Due to the limitations of the construction site, the aesthetic requirements of the function and the form of the building, The plane arrangement of the building inevitably forms an irregular shape. In practical engineering, the method of dealing with the plane irregular structure is usually to set up seismic joints to divide it into several more regular element structures. However, in the past earthquake disasters, The disasters caused by the installation of anti-seismic joints are common, especially the earthquake damage caused by the recent Wenchuan earthquake in China, which inspired us to think: how does the installation of the anti-seismic joints affect the seismic performance of the structure. There are few and shallow researches on seismic joints, which are limited to the theoretical analysis of seismic joints. Some scholars also discuss the influence of the installation of seismic joints on the structure from concrete engineering examples. In this paper, the elastic dynamic time-history analysis method is applied to different seismic fortification intensity and irregular plane form. In this paper, the influence of seismic joints on the seismic behavior of RC frames is analyzed by comparing the numerical models with or without seismic joints. Therefore, the research content of this paper has important theoretical significance and practical engineering value. This paper first introduces the definition of plane irregular structures at home and abroad and the stipulations on the width of seismic joints, and summarizes the progress of the regulations on seismic joints in our country and the research situation of determining the width of seismic joints. This paper points out the advantages and disadvantages of the anti-seismic joint and the influencing factors of the width of the anti-seismic joint. On the basis of summarizing the calculation and analysis method of seismic action and the seismic design method of irregular building, the MIDAS/GEN finite element analysis program is used. Response spectrum analysis method and elastic time history analysis method are used to calculate and analyze the selected example model. On the basis of summarizing the three elements of ground motion and the selection method of seismic wave, It is determined that El Centro wave Northridge wave and Sanfernado wave are used to excite the model from X direction and Y direction respectively. The results of three indexes of natural vibration period, interlayer displacement angle and steel bar content under the action of three seismic waves in two directions are analyzed and compared. The following conclusions are drawn: when the ratio of the plane concave dimension to the total dimension of the corresponding projection direction is less than 0.3, the interlayer displacement angle of the jointed structure is larger than that of the non-jointed structure. 2. 2. 2 plane concave dimensions and corresponding dimensions are obtained. When the ratio of total dimension of projection direction is greater than 0.3, the interlayer displacement angle of five-story jointed structure is smaller than that of non-jointed structure. 3 plane concave dimension is larger than that of corresponding projection direction when the ratio of total dimension of projection direction is greater than 0.3, there are 10 layers and 13 layers with joint when the ratio of total dimension of projection direction is greater than 0.3. The interstory displacement angle of the structure is larger than that of the non-jointed structure.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.4;TU352.11

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