CFRP布抗剪加固预加载RC梁的力学性能研究  

Study on the Mechanical Properties of Preloaded RC BeamsShear-Strengthened with CFRP Sheets

作　　者：黄志刚 林俊 黄卫国 王海涛 吴琼[4] Huang Zhigang;Lin Jun;HuangWeiguo;Wang Haitao;Wu Qiong(Jiangxi Transportation Engineering Group Co.,Ltd.,Nanchang 330038,China;Jiangxi Bridge Intelligent Maintenance Engineering Technology Research Center,Nanchang 330038,China;Jiangxi Highway Engineering Testing Center,Nanchang 330013,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210096,China)

机构地区：[1]江西省交通工程集团有限公司,江西南昌330038 [2]江西省桥梁智能养护工程技术研究中心,江西南昌330038 [3]江西省公路工程检测中心,江西南昌330013 [4]河海大学土木与交通学院,江苏南京210096

出　　处：《华东交通大学学报》2024年第3期37-44,共8页Journal of East China Jiaotong University

基　　金：江西省交通运输厅科技项目(2022H0020)。

摘　　要：【目的】为了研究端部锚固方法和预加载对碳纤维复材(CFRP)加固钢筋混凝土(RC)梁抗剪性能的影响,【方法】进行了4根矩形RC梁的剪切试验,分析了失效模式、荷载-挠度曲线、特征荷载、箍筋和CFRP应变的发展,最后,采用既有的CFRP加固RC梁抗剪承载力计算方法对文章试件的抗剪承载力进行了预测。【结果】试验结果表明,在可靠的端部锚固下,采用U形CFRP条带加固可以显著提升RC梁的抗剪性能;抗剪加固效果受CFRP条带的端部锚固方法影响很大,机械锚固显著优于CFRP布压条锚固,相比于未加固梁,采用机械锚固的加固梁抗剪承载力提高了约60%,而CFRP布压条锚固的抗剪承载力仅提高了9.8%;预加载虽然明显降低了加固梁的开裂荷载,但对抗剪承载力几乎没有影响。【结论】研究结果可为CFRP布抗剪加固RC梁的工程应用提供参考。【Objective】The shear tests of four rectangular reinforced concrete(RC)beams were conducted to investigate the effects of the end-anchorage method and preloading on the shear behavior of the carbon fiber reinforced polymer(CFRP)-strengthened RC beams.【Method】The failure mode,load-deflection curve,characteristic load,strain developments of the stirrup and CFRP were analyzed.Finally,the shear capacity of the specimens was predicted using the existing calculation methods for the shear capacity of the CFRP-strengthened RC beam.【Result】The test results show that the using U-shaped CFRP strengthening can significantly enhance the shear behavior of RC beams under the reliable end-anchorage.The shear strengthening effect is significantly affected by the end-anchorage methods.The mechanical anchorage is obviously superior to the CFRP sheet anchorage.Compared with the unstrengthened beam,the shear capacity of the strengthened beam with the mechanical anchorage increases by about 60%, whereas that with the CFRP sheet anchorage only increases by 9.8%. The preloadingsignificantly decreases the cracking load of the strengthened beams, but does not affect the shear capacity.【Conclusion】The research results can provide reference for the engineering application of shear strengtheningof RC beams with CFRP sheets.

关 键 词：CFRP布 抗剪加固 锚固方法 预加载 钢筋混凝土梁 

分 类 号：TU375[建筑科学—结构工程] U416[交通运输工程—道路与铁道工程]