考虑结构与地震动双重不确定性的混凝土框架建筑地震易损性研究

SESMIC VULNERABILITY ANALYSIS OF RC BUILDINGS CONSIDERING DOUBLE UNCERTAINTY OF STRUCTURE AND GROUND MOTION

考虑建筑结构与地震动的双重不确定性对地震易损性分析的影响,采用人工合成地震波及拉丁超立方体抽样来考虑地震动与结构的不确定性,形成了300个"结构-地震动"的随机样本,借助于Open SEES有限元平台对混凝土平面框架结构分别进行概率地震需求分析与概率能力分析,绘制混凝土框架建筑物的地震易损性曲线,并分别讨论结构高宽比及轴压比对混凝土框架结构抗震性能的影响。研究表明:地震动与结构的双重不确定性对地震易损性评估的结果影响显著,结构的地震易损性性能受轴压比影响较为明显,所提及的方法对于地震易损性分析具有很好的应用前景。

Three hundred structure-earthquake random samples were formulated to investigate double uncertainties of structures and ground motions based on synthetic seismic waves and Latin-Hypercube Sampling. The probabilistic seismic demand analysis and probability capability analysis of the samples were carried out to estimate variability in the response of structure subjected to seismic excitations by means of OpenSEES. Seismic vulnerability curves were drawn to investigate the law of influence of aspect ratio and axial compression ratio on the structural seismic performance. It was indicated that uncertainties of structures and ground motions had a significant influence on seismic vulnerability assessment. Meanwhile it was seen that axial compression ratio caused significant effects on seismic vulnerability performance. It would be advisable to use the method mentioned in this paper to assess seismic vulnerability performance for RC buildings.