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（西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055）

［摘要］基于已有鋼材力學(xué)性能及鋼材厚度銹蝕規(guī)律，對(duì)4個(gè)不同服役時(shí)間（0年、15年、30年、45年）的鋼框架結(jié)構(gòu)以峰值加速度(PGA)作為地震動(dòng)強(qiáng)度指標(biāo)，以結(jié)構(gòu)整體損傷作為地震需求指標(biāo)，對(duì)結(jié)構(gòu)進(jìn)行增量動(dòng)力時(shí)程分析(IDA)，對(duì)分析結(jié)果進(jìn)行對(duì)數(shù)線性擬合，分別建立離散的地震易損性曲線，同時(shí)建立連續(xù)的地震易損性曲線。以一個(gè)15層3跨鋼框架為例，建立有限元模型并對(duì)結(jié)構(gòu)進(jìn)行IDA分析，同時(shí)建立不同服役時(shí)間地震易損性曲線。研究成果可為結(jié)構(gòu)的全壽命設(shè)計(jì)、既有結(jié)構(gòu)的運(yùn)營(yíng)以及地震風(fēng)險(xiǎn)評(píng)估等提供理論依據(jù)。

［關(guān)鍵詞］損傷模型； 地震易損性； IDA分析； 鋼材銹蝕

中圖分類號(hào)：TU391    文獻(xiàn)標(biāo)識(shí)碼：A    文章編號(hào)：1002-848X(2015)03-0073-04

Seismic vulnerability analysis of steel structure in service based on damage model

Zheng Shansuo, Tian Jin, Han Yanzhao, Zhang Jitao, Cheng Yang

 (School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China)

Abstract:Based on the current mechanical properties of steel and steel thickness corrosion law,

incremental dynamic analysis

（IDA）  was carried out on four steel frame structures with different service times (0 years, 15 years, 30 years, 45 years) with PGA as the earthquake intensity index and the structure overall damage as the seismic demand index. Log linear fitting was conducted on the analytical results to establish discrete seismic vulnerability curves respectively and establish continuous seismic vulnerability curves according to the proposed method. Taking a 15story 3span steel frame as an example, the finite element model was established and IDA analysis of the structure was conducted. At the same time, seismic vulnerability curves of different service times were established according to the proposed method. The research results can provide a theoretical basis for the life cycle design of the structure, existing structure operation and seismic risk assessment.

Keywords:damage model; seismic vulnerability; incremental dynamic analysis (IDA); steel corrosion

*國(guó)家科技支撐計(jì)劃(2013BAJ08B03),國(guó)家自然科學(xué)基金（50978218，51108376）,教育部高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金(20136120110003),陜西省科研項(xiàng)目(2012K1203012011KTCQ0305，2013JC16)。

通訊作者：田進(jìn)，碩士研究生，Email:tianjin20073352@126.com。

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