填充墙对混凝土框架结构抗倒塌影响分析

发布时间：2018-06-18 13:11

本文选题：钢筋混凝土框架结构 + 填充墙　；参考：《兰州交通大学》2017年硕士论文

【摘要】：建筑结构在遭受地震或者偶然荷载情况下,很容易造成结构发生局部破坏,最终导致整个建筑发生连续性倒塌,所以建筑结构的抗连续性倒塌能力在工程领域受到高度关注。以前工程人员主要研究建筑结构在遭受地震作用下是否发生破坏,而对建筑结构抗连续性倒塌的研究在我国起步较晚,而且主要集中在对纯钢筋混凝土框架结构的研究。填充墙作为钢筋混凝土框架结构重要的一部分,工程人员往往在设计中简单的只考虑填充墙的荷载作用或者仅对框架结构的周期进行折减,这样的处理方法明显没有考虑到填充墙在框架结构抗连续性倒塌中的作用。因此本文对纯框架结构和考虑填充墙影响的框架结构进行抗倒塌分析,通过对比其拆柱节点的竖向位移、梁和柱内力变化情况等来分析填充墙对钢筋混凝土框架抗连续性倒塌的影响。具体研究内容如下:(1)采用PKPM结构设计软件按照我国相关结构规范设计一栋六层钢筋混凝土框架结构,然后以sap2000有限元分析软件为平台建立三维模型。采用备用路径法对不考虑填充墙影响的框架结构进行线性静力分析,通过数据分析可以得出:按照我国现行的设计规范设计的钢筋混凝土框架具有一定的抗连续性倒塌能力,只有在拆除内柱后剩余结构才会发生连续性倒塌。(2)对不考虑填充墙影响的框架模型,拆柱节点的位移大小为:内柱长边中柱短边中柱角柱。当拆除内柱时,节点竖向位移持续增大,剩余结构会发生连续性倒塌。对于填充墙框架模型,拆柱节点的位移大小关系和纯框架模型一样,只是考虑填充的影响其节点竖向位移明显减小,位移曲线波动更平稳。(3)通过对比梁、柱内力时程曲线,填充墙框架模型梁和柱承受的内力比纯框架模型更少,而且内力时程曲线波动更为平稳。距离拆除柱较近的梁和柱内力时程曲线波动明显比距离较远的梁和柱更剧烈,由此可以看出拆除柱之后产生的动力效应,基本以拆除柱为中心,向四周逐渐减弱。(4)考虑填充墙影响的框架结构相比纯框架结构,不仅可以减少节点竖向位移、减少梁柱所承受的内力,还可以减弱塑性铰的发展程度。这充分说明填充墙可以承担部分竖向荷载,还能使失效柱范围内的荷载通过更广泛的路径传递给其他构件,提高了钢筋混凝土框架的抗倒塌能力。
[Abstract]:In the case of earthquake or accidental load, the structure is prone to local destruction, which leads to the continuous collapse of the whole building. Therefore, the ability of building structure to resist continuous collapse is highly concerned in the field of engineering. In the past, engineers mainly studied whether the building structure was damaged by earthquake, but the research on the continuous collapse of building structure started late in our country, and mainly focused on the study of pure reinforced concrete frame structure. As an important part of reinforced concrete frame structure, infilled wall is usually designed by engineers simply considering the load of infilled wall or only reducing the period of frame structure. This method obviously fails to consider the role of infilled walls in the continuous collapse of frame structures. Therefore, the anti-collapse analysis of pure frame structure and frame structure considering the influence of infilled wall is carried out, and the vertical displacement of the column breaking joint is compared. The influence of infilled walls on the continuous collapse of reinforced concrete frames is analyzed by changing the internal forces of beams and columns. The specific research contents are as follows: (1) A six-story reinforced concrete frame structure is designed according to the relevant structural codes of our country by using PKPM structural design software, and then the three-dimensional model is established on the platform of sap2000 finite element analysis software. The linear static analysis of frame structure without the influence of infilled wall is carried out by the method of spare path. Through the data analysis, it can be concluded that the reinforced concrete frame designed according to the current design code of our country has the ability of resisting continuous collapse to a certain extent. Only after removing the inner column will the residual structure collapse continuously. 2) for the frame model which does not consider the effect of the infilled wall, the displacement of the disassembled column joint is: the angle column of the long side column with the short side column of the inner column. When the internal column is removed, the vertical displacement of the joint increases continuously and the residual structure collapses continuously. For the infilled wall frame model, the displacement relation of column breaking joint is the same as that of pure frame model, only considering the effect of filling, the vertical displacement of the joint is obviously reduced, and the fluctuation of displacement curve is more stable. 3) by comparing beam, the time history curve of column internal force is obtained. The internal force of beam and column in infilled wall frame model is less than that in pure frame model, and the fluctuation of time history curve of internal force is more stable. The fluctuation of the time history curve of the internal force of the beam and column closer to the dismantled column is obviously more intense than that of the beam and column which is far away. From this, it can be seen that the dynamic effect after removing the column is basically centered on the dismantled column. Compared with the pure frame structure the vertical displacement of joints and the internal force of Liang Zhu can be reduced and the development degree of plastic hinge can be weakened. This fully shows that the infilled wall can bear some vertical loads and the load in the range of failure columns can be transferred to other members through a more extensive path, thus improving the collapse resistance of reinforced concrete frames.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.4

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