考虑粘结应力传递的抗弯加固锈蚀RC梁挠度计算方法  

Deflection calculation method for corroded RC beams strengthened by bending considering bond stress transfer

作　　者：唐皇 彭建新[2] 王晗 张建仁[2] TANG Huang;PENG Jianxin;WANG Han;ZHANG Jianren(School of Civil Engineering, Hunan City University, Yiyang 413000,Hunan, P. R. China;School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, P. R. China;State Gird Yiyang Power Supply Company, Yiyang 413000, Hunan, P. R. China)

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000 [2]长沙理工大学土木工程学院,长沙410114 [3]国家电网益阳供电公司,湖南益阳413000

出　　处：《土木与环境工程学报（中英文）》2022年第1期94-104,共11页Journal of Civil and Environmental Engineering

基　　金：国家重点基础研究发展计划(973项目)(2015CB057705);国家自然科学基金(52078056);湖南省自然科学青年基金(2019JJ50023);湖南省自然科学基金(2018JJ2438);湖南省教育厅科学研究项目(18A136);2020年益阳市银城科技人才托举工程项目。

摘　　要：基于微元法思想,考虑锈蚀钢筋与混凝土之间粘结应力的传递,以及粘结应力传递前后截面应变的相容性,建立了钢板和FRP抗弯加固锈蚀RC梁挠度计算模型。为了验证计算模型的正确性,对比分析了多组试验结果。结果表明:在不同荷载等级下,与不考虑粘结应力的传递模型相比,考虑粘结应力的传递模型对钢板抗弯加固锈蚀RC梁的挠度计算结果更接近试验值。考虑粘结应力传递模型的极限荷载和对应极限挠度的误差范围为-0.6%~1.8%和-10.5%~9.1%,不考虑粘结应力传递模型的极限荷载和对应极限挠度的误差范围为1.1%~6.1%和-11.4%~-2.2%。该模型也能较精确地预测FRP材料(包括CFRP和BFRP)抗弯加固锈蚀RC梁的荷载挠度曲线,极限荷载值的误差范围为-3.6%~4.2%,极限挠度误差范围为-4.2%~8.3%。Based on the differential element method,considering transfer of bond stress between corroded steel bar and concrete,and the compatibility of cross-section strain before and after bond stress transfer is considered,the deflection calculation model of corroded RC beams strengthened by steel plates and FRP is proposed in this paper.To validate it,the testing results in existing literatures and this study,are compared and analyzed.The results show that under different loading levels,compared with the strengthened beam without considering bond stress transfer,the deflection calculation results via proposed model considered the bond stress transfer of corroded RC beam strengthened by bending is more closer to the testing values.The relative errors of the former ultimate loading and the corresponding ultimate deflection is-0.6%~1.8%and-10.5%~9.1%,respectively,while the relative errors of the latter ultimate loading and the corresponding ultimate deflection is 1.1%~6.1%and-11.4%~-2.2%,respectively.The proposed model can also accurately predict the load-deflection curve of corroded RC beams strengthened by FRP materials(including CFRP and BFRP).The improved relative error of ultimate loading value is-3.6%~4.2%,and the that for ultimate deflection is-4.2%~8.3%.

关 键 词：钢筋混凝土梁 锈蚀 抗弯加固 挠度 粘结应力传递 

分 类 号：TU375.1[建筑科学—结构工程]