基于IDA的多龄期钢排架结构地震易损性分析  

Seismic Vulnerability Analysis of Multi-age Steel Bent Frame Structures Based on IDA Method

作　　者：郑山锁[1] 左英[1] 张晓辉[1] 石磊[1] 黄威曾 郑捷[1] ZHENG Shansuo;ZUO Ying;ZHANG Xiaohui;SHI Lei;HUANG Weizeng;ZHENG Jie(School of Civil Engineering,Xi an University of Architecture and Technology,Xi an 710055,Shaanxi,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：《地震工程学报》2018年第4期698-704,共7页China Earthquake Engineering Journal

基　　金：国家科技支撑计划(2013BAJ08B03);国家自然科学基金计划(51678475);陕西省重点研发计划(2017ZDXM-SF-093);陕西省教育厅产业化项目

摘　　要：针对钢材锈蚀导致结构抗震性能退化的现象,需对多龄期结构进行抗震性能评估。基于酸性大气环境下不同锈蚀程度钢材材性试验结果,以SAP2000为平台建立不同服役龄期(30年、40年、50年、60年)钢排架结构数值模型。选取PGA为地震动强度指标,最大层间位移角为地震需求参数对模型进行增量动力分析(IDA),建立结构地震需求模型,基于地震需求模型建立多龄期钢排架结构厂房地震易损性曲线和震害矩阵。研究成果可为城市多龄期建筑地震风险评估提供依据。Steel Structure is widely used for industrial architecture because of its advantages of being light weight,higher strength,and better plasticity and toughness.Unfortunately,the poor performance that resists corrosion has been gradually found recently with the steel widely used.The seismic performance of structures in different service times is necessary to be evaluated since the corrosion of steel directly lead to the deterioration of seismic performance and stiffness of structure.In order to study the impact of corrosion on steel mechanical properties in the acidic atmospheric environment and then analysis the seismic vulnerability of multi-age steel structures,105 standard steel material specimens corroded by artificial climate accelerated corrosion test technique were carried out under tensile test.Based on tensile test data,the linear regression relationship between the steel mechanical properties(yield strength,ultimate strength,elongation,elastic modulus)and weightlessness rate was established.At the same time,the corrosion rate and the initial corrosion time of steel bent frame structure were accounted for by using findings from related research.Based on the result of material performance of different corrosive steel in acidic atmospheric environment and combined with corrosion rate and the initial corrosion time,the analysis platform SAP2000 was employed to build numerical models of steel bent frame structures with different service times(30 years,40 years,50 years,60 years).In order to eliminate the influence of uncertainty of seismic record,24 seismic records had been chosen in this paper.The incremental dynamic analysis(IDA)was carried out on the models with PGA as the earthquake intensity index and maximum inter-story drift as the seismic demand index.The relationship of probabilistic seismic demand was obtained by IDA analysis for multi-age steel bent frame structures.The statistical parameters of the probabilistic seismic capacity model were evaluated using existing research.Consequently,seismic vul

关 键 词：钢排架 多龄期 增量动力分析 最大层间位移角 地震易损性 

分 类 号：TU391[建筑科学—结构工程] TU317.1