湿热环境下外贴CFRP加固RC梁抗弯性能有限元分析  

Finite element analysis of flexural performance of RC beams strengthened with externally bonded CFRP under hygrothermal environment

作　　者：张智梅[1] 马嘉辰 ZHANG Zhimei;MA Jiachen(Department of Civil Engineering,School of Mechanics&Engineering Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学力学与工程科学学院土木工程系,上海200444

出　　处：《复合材料科学与工程》2024年第4期76-82,89,共8页Composites Science and Engineering

基　　金：国家自然科学基金(51978392)。

摘　　要：本文研究了湿热环境下外贴CFRP加固RC梁抗弯性能。首先,基于已有的FRP-混凝土界面双参数黏结滑移模型,引入湿度和温度对断裂能G_(f)、界面刚度B的影响系数,建立了湿热环境下界面黏结滑移模型。然后,利用该界面模型对一组湿热条件作用下的试验梁进行有限元数值模拟,将模拟结果与试验结果进行对比分析,验证模型的正确性。最后,使用已验证的有限元模型深入分析不同湿热条件下CFRP与混凝土的宽度比和CFRP的加固量等因素对钢筋混凝土加固梁抗弯性能的影响。结果表明:本文建立的CFRP-混凝土黏结滑移模型,可以有效地模拟湿热环境下的界面性能;湿热条件下的加固梁主要发生剥离破坏,且随着湿热环境恶化,加固梁受弯承载力和对应的挠度明显下降;湿热环境下,可以通过适当增加CFRP与混凝土的宽度比和CFRP的加固量提高加固梁的受弯承载力。To study the flexural performance of externally bonded CFRP-reinforced RC beams under hygrothermal environment,this paper firstly establishes an interface bond-slip model under hygrothermal environment based on the existing two-parameter bond-slip model of FRP-concrete interface and introduces the influence coefficients of humidity and temperature on fracture energy and interface stiffness.Then,the interface model is used to perform finite element numerical simulations on a set of test beams under the action of hygrothermal conditions,and the simulation results are.compared with the test results to verify the correctness of the model.Finally,the validated finite element model was used to analyze in depth the effects of factors such as the width ratio of CFRP to concrete and the amount of CFRP reinforcement on the flexural performance of reinforced concrete reinforced beams under different hygrothermal conditions.The results show that the CFRP-concrete bond-slip model established in this paper can effectively simulate the interface performance under the hygrothermal environment;peeling damage mainly occurs in the reinforced beams under the hygrothermal condition,and the flexural load capacity and corresponding deflection of the reinforced beams decrease significantly with the deterioration of the hygrothermal environment;the flexural load capacity of the reinforced beams can be improved by appropriately increasing the width ratio of CFRP to concrete and the amount of CFRP reinforcement under the hygrothermal environment.The flexural load capacity of the reinforced beam can be improved by increasing the width ratio of CFRP to concrete and the amount of CFRP reinforcement.

关 键 词：外贴CFRP加固 湿热环境 黏结界面 剥离 有限元分析 

分 类 号：TB332[一般工业技术—材料科学与工程]