摘要
FRP与混凝土的界面黏结效果是外贴FRP加固技术(EB-FRP)中的关键,FRP与混凝土黏结界面过早失效会使FRP的利用效率大大降低。混合粘贴纤维复合材料加固(HB-FRP)以机械锚固和胶黏结并用的手段,用以抑制FRP的过早剥离。为明确HB-FRP对界面黏结性能的影响,进行了不同锚固形式的单向剪切试验,对比研究了EB-FRP和HB-FRP锚固方式的锚固性能,分析了不同扭矩和钢扣件个数对HB-FRP试件的剥离荷载和FRP利用率的影响,基于HB-FRP组合界面黏结-滑移统一模型对试验数据进行拟合,通过试验结果验证HB-FRP组合界面剥离荷载计算模型。结果表明,相较于EB-FRP,HB-FRP试件的剥离荷载和FRP利用率均有明显提高,且随着扭矩和扣件个数的增加而提高;验证了剥离荷载计算模型的有效性,可用于计算HB-FRP组合界面的剥离荷载。
The bonding effect of the interface between FRP and concrete is the key to external bonded FRP(EB-FRP),and the premature failure of the interface between FRP and concrete will greatly reduce the utilization efficiency of FRP.Hybrid bonded FRP(HB-FRP)is used to restrain the premature stripping of FRP by mechanical anchorage and cementation.In order to clarify the influence of HB-FRP on the bonding properties of the interface,unidirectional shear tests of different anchoring forms were carried out,and the anchoring properties of EB-FRP and HB-FRP were compared.The influence of different torques and the number of steel fasteners on the stripping load of HB-FRP specimens and on the utilization rate of FRP were analyzed.The experimental data were fitted based on the bond-slip model of HB-FRP composite,and the calculation model of interface stripping load of HB-FRP composite was verified by the test results.The results show that,compared with EB-FRP,the stripping load and the FRP utilization ratio of HB-FRP reinforced specimens are significantly increased,and increase with the increase of torque and the number of fasteners.The validity of the stripping load calculation model is verified,which can be used to calculate the stripping load at the interface of HB-FRP composite.
作者
魏琦安
高磊
黄悦
WEI Qi’an;GAO Lei;HUANG Yue(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China;Geotechnical and Structural Engineering Research Centre,Shandong University,Jinan 250061,China)
出处
《青岛理工大学学报》
CAS
2024年第3期1-10,共10页
Journal of Qingdao University of Technology
基金
山东省自然科学基金青年基金资助项目(ZR2021QE216)。
