- 摘 要
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(1 西安建筑科技大學土木工程學院, 西安 710055;2 西安建筑科技大學建筑設計研究院, 西安 710055)
[摘要]銹蝕引起鋼筋截面面積縮小、力學性能劣化以及鋼筋混凝土間粘結性能退化等,是導致結構抗震性能退化的最主要因素。基于增量動力分析(IDA)方法,通過對不同銹蝕程度的RC框架結構進行抗地震倒塌易損性分析,討論了鋼筋銹蝕程度對RC框架結構在大震、特大地震下的抗地震倒塌能力和抗地震倒塌安全儲備能力的影響,并根據分析結果提出了相關建議。結果表明,鋼筋銹蝕程度對其抗地震倒塌能力有重要影響,特別是在特大地震下,當鋼筋銹蝕率大于10%時,其影響最為顯著。
[關鍵詞]框架結構; 鋼筋銹蝕; 增量動力分析; 抗地震倒塌安全儲備
中圖分類號:TU318 文獻標識碼:A 文章編號:1002-848X(2014)16-0059-05
Study on seismic collapse resistance ability of the corroded RC frame structures
Zheng Shansuo1, Sun Longfei1, Yang Wei1, Zhu Shuaishuai1, Tian Wei2
(1 Department of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2 Architectural Design and Research Institute, Xi’an University of Architecture and Technology, Xi’an 710055, China)
Abstract: Corrosion is the most important factor in the structural seismic performance degradation, which leads to rebar section area reduction, mechanical properties degradation and bonding properties degradation between reber and concrete. Collapse fragility analysis of RC frame structures with different corrosion extent was carried out based on incremental dynamic analysis (IDA) method. The influence of the rebar corrosion extent on the seismic collapse resistance ability and safety margin against seismic collapse was researched under the rare earthquake and the mega earthquake. Relevant suggestions were proposed based on the analysis results. The results show that the rebar corrosion extent has a great influence on the seismic collapse resistance ability, especially the structures under the mega earthquake with the rebar corrosion rate greater than the 10%.
Keywords: frame structure; rebar corrosion; incremental dynamic analysis; safety margin against seismic collapse
*國家科技支撐計劃(2013BAJ08B03),國家自然科學基金(50978218,51108376),高等學校博士學科點專項科研基金(20106120110003),陜西省科研項目(2012K12-03-01,2011KTCQ03-05)。
作者簡介:鄭山鎖,教授,博士生導師,Email:zhengshansuo@263.net。
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