基于随机IDA的多龄期钢框架地震易损性分析  

Seismic vulnerability analysis of multi-age steel frame structures based on random IDA

作　　者：郑山锁[1] 张晓辉[1] 王晓飞[1] 程洋[1] 孙乐彬[1] ZHENG Shansuo ZHANG Xiaohui WANG Xiaofei CHENG Yang SUN Lebin(School of Civil Engineering, Xi＇ an University of Architecture and Technology, Xi＇ an 710055, China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《世界地震工程》2016年第4期266-276,共11页World Earthquake Engineering

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)

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。The city coastal atmospheric environment was simulated by means of the aerosol corrosion box. Conducting the steel specimen tensile test of different extent of corrosion in coastal atmospheric environment, the rule that the steel mechanical properties （yield strength, ultimate strength, elongation and elastic modulus） degrade with increase of weight loss rate was got. With the degradation laws of steel mechanical properties, a time-varying overall seismic damage model of steel frame structure was established. Based on the numerical simulation of ABAQUS, taking into account the structure and ground motion uncertainty , 4 finite element models of six - story steel frame structures with different ages （ 0-year, 20-year, 35-year, 50-year） were built. The seismic vulnerability analysis of multi - age steel frame structure was conducted based on random IDA analysis that the PGA and damage index were taken as the ground motion intensity index and seismic demand index respectively. The result show that with the growth of age, structural failure probability increases gradually, and under same condition, the increment of structureal failure probability increases. The influence of the age on failure probability increases with increse of damage extent.

关 键 词：多龄期 时变地震损伤模型 不确定性 随机增量动力分析 地震易损性 

分 类 号：TU391[建筑科学—结构工程] TU317.1