大跨度張弦梁結構易損性及評估分析*
李志安1，何江飛2，高博青3
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李志安1，何江飛2，高博青3（1 杭州華東鋼結構制造有限公司，杭州 311200； 2 浙江省電力設計院，杭州310012；3 浙江大學建筑工程學院，杭州 310058)［摘要］由于超越荷載和罕遇地震的作用，大跨度張弦梁結構可能由此而發(fā)生整體或連續(xù)倒塌。考慮結構和抗力的不確定性，分析了在超越荷載和罕遇地震下結構的易損性。首先，基于蒙特卡洛法和拉丁超立方抽樣法，研究活荷載的超越幅度與結構失效概率之間的關系，繪制其靜力易損性曲線；其次，基于增量動力時程分析方法，研究不同地震波作用與結構失效概率之間的關系，繪制結構倒塌易損性曲線；最后，研究不同預應力水平對其易損性的影響。結果表明，基于易損性曲線可預測結構在超越荷載和罕遇地震下的失效概率；大跨度張弦梁結構易損性較低；適當提高預應力水平，可以改善結構易損性。［關鍵詞］張弦梁結構；超越荷載；不確定性；預應力水平；易損性曲線中圖分類號：TU393.3 文獻標識碼：A 文章編號：1002-848X(2013)02-0041-04Fragility analysis and assessment of large-span beam string-structuresLi Zhi′an1, He Jiangfei2, Gao Boqing3(1 Hangzhou Huadong Steel Construction Co., Ltd., Hangzhou 311200, China; 2 Zhejiang Electric Power Design Institute，Hangzhou 310012, China; 3 College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China)Abstract: Due to beyond loads and rare earthquakes, full failure and progressive collapse may be happened on large-span beam string-structures. Considering the uncertainty of structure and resistance, fragility analysis on beam string-structures has been finished under beyond loads and rare earthquakes. At first, employing Monte Carlo and Latin hypercube sampling methods, the relationship between alive load amplitude and the failure probability was studied, the static fragility curves were drawn. Secondly, based on time-history method, the relationship of seismic intensity and the failure probability of structural collapse was considered, the seismic fragility curves were gotten too. The influence of different pre-stress distribution on structural fragility was also discussed and the following results were obtained. Fragility curve can predict the failure probability of structure under beyond loads and rare earchtuqkes, large-span beam string-structures have lower fragility, and as the pre-stress increases, the performances of structure are improved.Keywords: beam string-structure; beyond load; uncertainty; prestress distribution; fragility curve*國家自然科學基金資助項目(51178414)，浙江省自然科學基金資助項目(Y1110438)。通訊作者：高博青，教授，Email: bqgao@zju.edu.cn參考文獻［1］ ELLINGWOOD B R. Earthquake risk assessment of building structures［J］. Reliability Engineering and System Safety,2001,74(3):251-262.［2］ HWANG H, LIU J B,CHIU Y H. Seismic fragility analysis of highway bridges［J］. Memphis, TN：University of Memphis，2000.［3］ HWANG H,劉晶波. 地震作用下鋼筋混凝土橋梁結構易損性分析［J］. 土木工程學報, 2004, 37(6): 47-51.［4］ 呂大剛,李曉鵬,王光遠. 基于可靠度和性能的結構整體地震易損性分析［J］. 自然災害學報, 2006, 15(2):107-114.［5］ JOONAM PARK, PEERANAN TOWASHIRAPORN, JAMES I CRAIG, et al. Seismic fragility analysis of low-rise unreinforced masonry structures［J］. Engineering Structures,2009, 31(4):125-137.［6］ JI J, ELNASHAI A S, KUCHMA D A. Seismic fragility relationships of reinforced concrete highrise buildings ［J］. The Structural Design of Tall and Special Buildings,2009,18(1), 259-277.［7］ 杜文風, 高博青, 董石麟.單層球面網殼結構動力強度破壞的雙控準則［J］.浙江大學學報：工學版, 2007,41(11): 1916-1920.［8］ ZAREIAN F, KRAWINKLER H. Assessment of probability of collapse and design for collapse safety ［J］. Earthquake Engineering and Structure Dynamics, 2007, 36(3): 1901-1914.［9］ 葉列平, 馬千里, 繆志偉. 結構抗震分析用地震動強度指標的研究［J］. 地震工程與工程振動, 2009, 29(4): 9-22.［10］ 施煒,葉列平,陸新征,等. 不同抗震設防RC框架結構抗倒塌能力的研究［J］.工程力學, 2011, 28(3):41-48.［11］ 沈世釗,支旭東. 球面網殼結構在強震下的失效機理［J］.土木工程學報, 2005,38(1):11-20.
