钢筋混凝土框架结构基于IDA方法的易损性分析

发布时间：2018-05-21 02:14

本文选题：混凝土框架结构 + 增量动力分析　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：钢筋混凝土框架结构作为一种广泛使用的结构形式,其抗震性能也一直为国内外所关注。大量的震害调查表明,框架结构的破坏模式以整体倒塌为主,外围围护结构及填充墙的破坏也比较显著。近年来,国内外对增量动力分析(IDA)方法及其结构的抗震性能进行了较多的研究,但地震强度参数的选取、结构抗震性能影响因素等问题的研究还不够深入。本文以钢筋混凝土框架结构为研究模型,通过增量动力分析方法对结构进行地震易损性评价,对比不同地震动强度参数确定其在IDA分析中的有效性,并分析填充墙布置形式、轴压比和混凝土强度等级对结构抗震性能的影响。本文采用Perform3D软件,分别建立了3层、6层、9层与12层钢筋混凝土平面框架,通过IDA分析,得到了IM-θmax分位数曲线和θmax的条件对数标准差,研究了不同高度框架结构在地震作用下,以不同地震动强度参数(Sa、PGA、PGV、S*)表示的IDA曲线的离散性变化,进而分析各个强度参数的有效性。通过IDA分析数据绘制结构的地震易损性曲线,对框架结构进行大震及巨震作用下的抗倒塌能力评价可知,按照我国规范进行常规设计的框架结构可以满足规范规定的抗震设防要求。此外,通过不同地震动强度参数表示的结构易损性矩阵对比,综合分析得到在框架结构的IDA分析中PGV的有效性较高,而且作为地震易损性分析的强度参数得到的超越概率值较为保守,有利于结构安全。通过易损性分析研究了填充墙布置、轴压比、混凝土强度这三个因素对框架结构抗震性能的影响,结果显示均匀布置的填充墙、轴压比的降低以及混凝土强度的提高都对框架结构的抗震能力有一定程度上的改善,为结构性能设计的细化提供参考。
[Abstract]:Reinforced concrete frame structure as a widely used structural form, its seismic performance has been concerned at home and abroad. A large number of earthquake damage investigations show that the failure mode of the frame structure is mainly the collapse of the whole, and the damage of the peripheral envelope structure and the infilled wall is also obvious. In recent years, many researches have been done on the incremental dynamic analysis (IDA) method and the seismic performance of the structure. However, the selection of seismic intensity parameters and the factors affecting the seismic performance of the structure are not sufficiently studied. In this paper, the reinforced concrete frame structure is taken as the research model, the seismic vulnerability of the structure is evaluated by incremental dynamic analysis method, the validity of the structure in IDA analysis is determined by comparing the different seismic intensity parameters, and the layout of the infilled wall is analyzed. The influence of axial compression ratio and concrete strength grade on the seismic performance of the structure. In this paper, Perform3D software is used to set up three or six stories and nine and twelve stories reinforced concrete frame respectively. Through IDA analysis, the IM- 胃 max quantile curve and the conditional logarithmic standard deviation of 胃 max are obtained, and the seismic action of different height frame structures is studied. The discrete variation of IDA curve expressed by different ground motion intensity parameters is analyzed, and the validity of each strength parameter is analyzed. The seismic vulnerability curve of the frame structure is drawn by the IDA analysis data, and the anti-collapse ability of the frame structure under the action of large earthquake and giant earthquake is evaluated. The frame structure designed according to the code of our country can meet the requirements of seismic fortification stipulated in the code. In addition, by comparing the structural vulnerability matrices with different ground motion intensity parameters, it is concluded that PGV is more effective in the IDA analysis of frame structures. Furthermore, the transcendental probability obtained as the strength parameter of seismic vulnerability analysis is conservative, which is beneficial to structural safety. Through vulnerability analysis, the effects of three factors on seismic performance of frame structure, such as the arrangement of infilled wall, axial compression ratio and strength of concrete, are studied. The results show that the infilled wall is uniformly arranged. The decrease of axial compression ratio and the improvement of concrete strength can improve the seismic capacity of frame structure to a certain extent and provide a reference for the refinement of structural performance design.
【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】：2015
【分类号】：TU375.4

【参考文献】