外贴CFRP加固RC连续梁的弯矩重分布性能研究  

Performance of moment redistribution in RC continuous beams strengthened with externally bonded CFRP

作　　者：周满清 张智梅[2] 程雯 ZHOU Man-qing;ZHANG Zhi-mei;CHENG Wen(Jiangsu Cheng-gui Design Co.,Ltd.,Wuxi 214061,China;Department of Civil Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]江苏城归设计有限公司,无锡214061 [2]上海大学土木工程系,上海200444

出　　处：《复合材料科学与工程》2022年第2期31-37,共7页Composites Science and Engineering

基　　金：国家自然科学基金(51978392)。

摘　　要：利用ABAQUS建立了外贴CFRP加固RC连续梁的有限元分析模型,探讨了CFRP加固量、CFRP黏结长度及加固位置对连续梁抗弯性能和弯矩重分布特性的影响,并针对正弯矩区加固梁和负弯矩区加固梁分别建立了其跨中和支座弯矩调幅系数随CFRP加固量、黏结长度变化的计算公式,且利用已有试验数据验证了公式的正确性。结果表明:无论是正弯矩区加固梁还是负弯矩区加固梁,屈服荷载和极限荷载均随CFRP加固量、黏结长度的增加而非线性增加,且CFRP加固量对梁承载力的影响均较CFRP黏结长度更显著;经弯矩调幅系数计算公式调整后的弯矩值与试验弯矩值更吻合,说明本文建立的弯矩调幅系数计算公式有效可行。The finite element analysis model of RC continuous beams strengthened with externally bonded CFRP is established by using ABAQUS. The effect of amount of CFRP, bonded length and position of CFRP on the flexural performance and moment redistribution characteristics of RC continuous beam is discussed, and the calculation formulas of the moment modulation coefficient at mid-span and central support which varies with the amount and bonded length of CFRP are established respectively for the beams strengthened in positive moment zone and in negative moment zone. Then, the correctness of the formulas are verified by the experimental data. The results show that both the yield load and the ultimate load increase nonlinearly with the increase of amount of CFRP and bonded length for beams strengthened in either positive or negative moment zone, and the effect of amount of CFRP on the flexural capacity of beam is more significant than that of CFRP bonded length, and the moment values adjusted by the formulas of moment modulation coefficient are more consistent with the experimental moment values, which shows that the formulas established in this paper are effective and feasible.

关 键 词：CFRP加固 连续梁 抗弯性能 有限元分析 弯矩调幅系数 

分 类 号：TB332[一般工业技术—材料科学与工程]