多维性能极限状态平面不规则结构易损性分析

发布时间：2018-04-30 07:07

本文选题：平面不规则结构 + 易损性分析　；参考：《振动.测试与诊断》2017年03期

【摘要】：针对平面不规则框剪结构,在引入最不利输入角度的基础上,提出多维性能极限状态的易损性分析方法。首先,利用Matlab中小波变换系数法,判别地震动的最不利输入方向;然后,采用层间位移和层间扭转角作为性能量化指标并考虑量化指标间的相关性,计算超越概率,从而得到二维性能极限状态下结构的易损性曲线。利用该方法对平面不规则框剪结构进行分析得到结构在正常使用、可以使用、生命安全、防止倒塌4个性能水平下的易损性曲线。结果表明:对于平面不规则结构,地震动输入角度对结构的抗震性能有不可忽略的影响;对平面不规则结构进行易损性分析时,应同时考虑层间位移和层间扭转角双指标的影响,防止高估这类结构的抗震性能。基于多维性能极限状态的易损性分析方法对平面不规则结构抗震性能的评估更为安全、可靠。
[Abstract]:On the basis of introducing the most unfavorable input angle to the plane irregular frame-shear structure, a vulnerability analysis method for multi-dimensional performance limit state is proposed. Firstly, the Matlab wavelet transform coefficient method is used to distinguish the most unfavorable input direction of the ground motion, and then the surpassing probability is calculated by using the interlayer displacement and the interlayer torsion angle as the performance quantization index and considering the correlation between the quantization indexes. Thus, the vulnerability curve of the structure under the two dimensional performance limit state is obtained. The method is used to analyze the plane irregular frame-shear structure and obtain the vulnerability curves of the structure under the four performance levels of normal use, safety of life and prevention of collapse. The results show that the input angle of ground motion has an important effect on the seismic performance of the irregular plane structure, and the vulnerability of the irregular plane structure is analyzed. In order to avoid overestimating the seismic performance of this kind of structures, the influence of both interstory displacement and interstory torsion angle should be taken into account. The vulnerability analysis method based on multi-dimensional performance limit state is more safe and reliable to evaluate the seismic performance of plane irregular structures.
【作者单位】：兰州理工大学防震减灾研究所;兰州理工大学西部土木工程防灾减灾教育部工程研究中心;
【基金】：国家自然科学基金资助项目(51578274;51178211)
【分类号】：TU352.11

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