外贴CFRP加固RC连续梁的抗弯性能及弯矩重分布分析  

Flexural Behavior and Moment Redistribution Analysis of Continuous Beams Strengthened with CFRP

作　　者：张智梅[1] 程雯 ZHANG Zhimei;CHENG Wen(Department of Civil Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学土木工程系,上海200444

出　　处：《结构工程师》2021年第3期159-166,共8页Structural Engineers

摘　　要：为了研究外贴CFRP加固RC连续梁的抗弯性能,通过ABAQUS建立了连续梁分析模型,讨论了CFRP黏结长度及加固位置对CFRP加固RC连续梁抗弯性能的影响;同时捉出了连续梁极限状态时跨中及中支座弯矩调幅系数随CFRP黏结长度变化的公式;最后通过已有试验数据验证公式的正确性。结果表明:外贴CFRP加固能显著改善RC连续梁的抗弯性能,随着CFRP黏结长度的增加,连续梁的极限荷载先增加后基本保持不变,且负弯矩区加固长度与跨度之比的最优取值为0.4,正弯矩区加固长度与跨度之比的最优取值为0.6。通过对比发现调幅后的弯矩值与试验弯矩值吻合较好,验证了弯矩调幅系数公式正确性,供工程设计人员参考。In order to discuss the flexural behavior of RC continuous beams strengthened with CFRP,a finite element model was built by using ABAQUS.Based on the validated model,the influence of CFRP length and reinforcement location on the flexural performance of RC continuous beams strengthened with CFRP was further analyzed.At the same time,the formulas of moment redistribution ratio of mid-span and raid-support changing with CFRP bond length in the limit state of continuous beam were put forward.Finally,the usage of the formulas was illustrated and the existing experimental data were used to verify the correctness of the formulas.The results show that the flexural performance of the RC continuous beam is improved when strengthened by CFRP.With the increase of the length of CFRP,ultimate load increases first and then remains unchanged.The optimum ratio of negative moment strengthened beams is suggested to be 0.4,and positive moment is suggested to be 0.6.It is found that the moments after amplitude modulation have good agreement with the test results,which can verify the correctness of the formulas of moment redistribution ratio.The conclusions can be used as references for engineering designers.

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：TU375.1[建筑科学—结构工程]