基于随机IDA的多龄期钢框架地震易损性分析

发布时间：2018-03-27 06:39

本文选题：多龄期　切入点：时变地震损伤模型　出处：《世界地震工程》2016年04期

【摘要】：利用气雾腐蚀箱对城市近海大气环境进行了模拟。对近海大气环境中不同锈蚀程度的钢材试件进行了拉伸试验,并获得了钢材力学性能(屈服强度、极限强度、伸长率和弹性模量)随失重率增大的退化规律。利用钢材力学性能退化规律,建立了钢框架结构的时变整体地震损伤模型。基于ABAQUS数值模拟,同时考虑结构与地震动的不确定性,建立了4个不同龄期(0年、20年、35年、50年)6层钢框架结构的有限元模型,以PGA作为地震动强度指标,以结构整体损伤为地震需求指标,对模型进行了随机IDA分析,并在IDA分析结果的基础上对结构进行了多龄期钢框架结构地震易损性分析。研究结果表明,随着龄期的增长,结构失效概率逐渐增大,且在同一损伤状态下,结构失效概率的增量也逐渐增大;龄期对结构失效概率的影响随损伤程度的增加而增大。
[Abstract]:In this paper, the atmospheric environment of urban offshore sea was simulated by using the aerosol corrosion box. The tensile tests of steel specimens with different corrosion degrees were carried out, and the mechanical properties of steel (yield strength, ultimate strength) were obtained. Based on the degradation law of steel mechanical properties, the time-varying global seismic damage model of steel frame structure is established. Based on the ABAQUS numerical simulation, the seismic damage model of steel frame structure is established. At the same time, considering the uncertainty of structure and ground motion, the finite element models of four steel frame structures with different ages (0, 20, 35, 50 years) are established. PGA is taken as the index of ground motion intensity, and the whole damage of the structure is taken as the seismic demand index. The random IDA analysis of the model is carried out, and based on the results of the IDA analysis, the seismic vulnerability of the multi-age steel frame structure is analyzed. The results show that the failure probability of the structure increases with the increase of age. Under the same damage condition, the increment of structural failure probability increases gradually, and the influence of age on structural failure probability increases with the increase of damage degree.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家科技支撑计划(2013BAJ08B03) 教育部高等学校博士学科点专项科研基金(20136120110003) 陕西省科研项目(2012K12-03-01,2011KTCQ03-05,2013JC16)
【分类号】：TU391

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