高强钢筋混凝土梁裂缝控制可靠度分析  

Reliability analysis on crack control of reinforced concrete beams with high-strength steel bars

作　　者：蔡江勇[1] 钟鸣 王雪亮[1] 董卫国 Cai Jiangyong;Zhong Ming;Wang Xueliang;Dong Weiguo(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;CITIC General Institute of Architectural Design and Research C o.,Ltd.,Wuhan 430014,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]中信建筑设计研究总院有限公司,武汉430014

出　　处：《建筑结构》2020年第3期85-88,共4页Building Structure

摘　　要：针对高强钢筋混凝土梁存在着裂缝开展较宽,以及计算裂缝宽度和实测裂缝宽度存在较大差距的情况,提出裂缝控制验算的可靠度双裕量的概念以及裕量转换的方法,采用蒙特卡洛法,对高强钢筋混凝土梁的裂缝控制可靠度进行了精细分析。研究表明,裂缝宽度限值与计算最大裂缝宽度之差,只是裂缝控制可靠度总裕量的一部分。基于裕量转换得到的结果表明,高强钢筋混凝土梁的实际裂缝控制可靠度并没有因配筋率的降低而严重降低,一般条件下的裂缝控制性能均可满足一类环境裂缝限值的要求。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.

关 键 词：钢筋混凝土梁 裂缝宽度 高强钢筋 可靠度 裕量 

分 类 号：TU375.1[建筑科学—结构工程]