疲劳荷载作用下CFRP板底层嵌贴加固RC梁开裂后挠度计算方法  

Calculation method of deflection after cracking of RC beams strengthened with CFRP plates under fatigue load

作　　者：邓朗妮[1] 雷丽贞 谢宏 周峥 廖羚[1] DENG Lang-ni;LEI Li-zhen;XIE Hong;ZHOU Zheng;LIAO Ling(Civil Engineering and Architecture College,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学土木建筑工程学院,柳州545006

出　　处：《复合材料科学与工程》2022年第1期62-67,共6页Composites Science and Engineering

基　　金：国家自然科学基金(51568008)。

摘　　要：基于5根试件梁的试验数据,分析疲劳荷载作用下CFRP板底层嵌贴加固钢筋混凝土梁跨中挠度的变化情况。试验结果表明:循环荷载作用下,钢筋混凝土梁截面抗弯刚度会产生疲劳衰减,导致截曲率不断延伸,从而使挠度持续增大;CFRP板底层嵌贴加固方式能有效抑制钢筋混凝土梁截面抗弯刚度的衰退速率,缓解曲率延伸,从而提升其疲劳受弯变形性能。最后引入受拉刚化效应法,推导出疲劳荷载作用下CFRP板底层嵌贴加固梁截面开裂后的挠度计算模型。计算结果表明:提出的挠度计算模型计算值与试验值吻合情况良好。Based on the test data of five specimen beams, the change of mid-span deflection of reinforced concrete beams strengthened with CFRP plates under fatigue load is analyzed. The test results show that under cyclic loading, the bending stiffness of reinforced concrete beams will produce fatigue attenuation, and the sectional curvature will continue to extend, resulting in the continuous increase. The embedded reinforcement method of CFRP plate bottom layer can effectively restrain the decline rate of flexural rigidity of reinforced concrete beams and relieve curvature extension, thus improving their fatigue flexural deformation performance. Finally, by introducing the method of tensile stiffening effect, the calculation model of deflection of beams strengthened with CFRP plates under fatigue load is derived. The calculation results show that the calculated values of the proposed deflection calculation model are in good agreement with the experimental values.

关 键 词：钢筋混凝土梁 CFRP 疲劳荷载 挠度 

分 类 号：TB332[一般工业技术—材料科学与工程]