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史煒洲1,2，童樂為1,3，陳以一1,3，錢余海4，李亞明2

（1 同濟(jì)大學(xué)建筑工程系， 上海 200092； 2 上海建筑設(shè)計研究院有限公司， 上海 200041；3 同濟(jì)大學(xué)土木工程防災(zāi)國家重點實驗室, 上海 200092； 4 寶鋼集團(tuán)結(jié)構(gòu)鋼研究所， 上海 201900）

 

［摘要］參照已有受腐蝕鋼材力學(xué)性能試驗數(shù)據(jù)和研究成果，采用有限元數(shù)值模擬方法，建立某12層住宅鋼結(jié)構(gòu)腐蝕前和腐蝕后的兩個模型，對經(jīng)城市大氣25～50年腐蝕后的住宅鋼結(jié)構(gòu)性能進(jìn)行分析，為綜合評估住宅鋼結(jié)構(gòu)防腐蝕層面的耐久性提供依據(jù)。建模時考慮腐蝕引起的構(gòu)件截面減損和鋼材力學(xué)性能降低的影響，以及室內(nèi)外構(gòu)件所處環(huán)境的差別。根據(jù)相關(guān)規(guī)范對結(jié)構(gòu)和構(gòu)件的驗算結(jié)果表明：城市大氣25～50年的腐蝕削弱了住宅鋼結(jié)構(gòu)承重構(gòu)件的承載力儲備，并使結(jié)構(gòu)的側(cè)向剛度降低。鑒于鋼結(jié)構(gòu)住宅在使用期內(nèi)不便進(jìn)行涂裝維護(hù)，為了保證結(jié)構(gòu)在50年設(shè)計使用期內(nèi)的安全性，住宅鋼結(jié)構(gòu)處于室外的承重鋼構(gòu)件，應(yīng)確保有10％的承載力儲備。

［關(guān)鍵詞］鋼材腐蝕； 結(jié)構(gòu)性能； 耐久性； 住宅鋼結(jié)構(gòu)； 案例分析

中圖分類號：TU391      文獻(xiàn)標(biāo)識碼：A      文章編號：1002-848X(2013)16-0088-05

 

Shi Weizhou1,2, Tong Lewei1,3, Chen Yiyi1,3, Qian Yuhai4, Li Yaming2

（1 Department of Building Engineering, Tongji University, Shanghai 200092, China; 2 Shanghai Institute of Architectural Design & Research Co., Ltd., Shanghai 200041, China; 3 State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China; 4 Research Institute of Structural Steel, Baosteel Group Corporation, Shanghai 201900, China）

 

Abstract: Based on existing test data and production of mechanical property of corroded steel, two finite element models of a 12-floor residential steel structure were founded by applying finite element numerical simulation technique to analyze the structural performance after 25 to 50 years of corrosion in urban atmosphere and to provide basis of synthetically evaluation of the influence of corrosion on the durability of residential steel structures. One model represented uncorroded structure and the other represented corroded structure. The building process of finite element model took the cross-section loss of members, reduction of steel mechanical property due to corrosion and the difference of air environment between indoor members and outdoor members into account. Results of checking according to correlative criterions of the overall structure and members indicate that corrosion in urban atmosphere for 25 to 50 years weakens the stock of bearing capacity of load-bearing structure and reduces the lateral rigidity of structure. In view of the situation that it is inconvenient to maintain the coating of residential steel structure during usage period，outdoor load-bearing members of residential steel structure should have a bearing capacity stock of 10% to ensure the safety of structure during the 50-year-long design working life.

Keywords: steel corrosion; structural behavior; durability; residential steel structure; case study

*國際鋼協(xié)Living Steel寶鋼鋼結(jié)構(gòu)住宅項目。

作者簡介：史煒洲，碩士，工程師，一級注冊結(jié)構(gòu)工程師．Email：shiwz@siadr.com.cn。