- 摘 要
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（1 武漢理工大學(xué)土木工程與建筑學(xué)院， 武漢 430070； 2 中信建筑設(shè)計研究總院有限公司， 武漢 430014）
［摘要］針對高強鋼筋混凝土梁存在著裂縫開展較寬，以及計算裂縫寬度和實測裂縫寬度存在較大差距的情況，提出裂縫控制驗算的可靠度雙裕量的概念以及裕量轉(zhuǎn)換的方法，采用蒙特卡洛法，對高強鋼筋混凝土梁的裂縫控制可靠度進行了精細分析。研究表明，裂縫寬度限值與計算最大裂縫寬度之差，只是裂縫控制可靠度總裕量的一部分?；谠Ａ哭D(zhuǎn)換得到的結(jié)果表明，高強鋼筋混凝土梁的實際裂縫控制可靠度并沒有因配筋率的降低而嚴重降低，一般條件下的裂縫控制性能均可滿足一類環(huán)境裂縫限值的要求。
［關(guān)鍵詞］鋼筋混凝土梁； 裂縫寬度； 高強鋼筋； 可靠度； 裕量
中圖分類號：TU375.1文獻標識碼：A文章編號：1002-848X(2020)03-0085-04
Reliability analysis on crack control of reinforced concrete beams with high-strength steel bars
Cai Jiangyong1, Zhong Ming1, Wang Xueliang1, Dong Weiguo2
(1 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China；2 CITIC General Institute of Architectural Design and Research Co．， Ltd．, Wuhan 430014， China)
Abstract:In view of the development of wide cracks in reinforced concrete beams with high-strength steel bars, and the large gap between the calculated crack width and the measured crack width, the concept of double allowance of the reliability of crack control checking calculation and the method of allowance conversion were proposed. The reliability of crack control of reinforced concrete beams with high-strength steel bars was analyzed by Monte Carlo method. The research shows that the difference between the crack width limit and the calculated maximum crack width is only a part of the total allowance of crack control reliability. The results based on the allowance conversion show that the actual crack control reliability of reinforced concrete beams with high-strength steel bars is not seriously reduced after the reduction of the reinforcement ratio, and the crack control performance under general conditions can meet the requirements of first-grade environmental crack limits.
Keywords:reinforced concrete beam; crack width; high-strength steel bar; reliability; allowance
作者簡介：蔡江勇，博士，副教授，Email:jycai@whut.edu.cn。
