拉剪组合荷载下FRP-钢胶接连接力学性能  

Mechanical Behavior of FRP-to-steel Adhesively-bonded Joint under Tensile/shear Combined Loading

作　　者：姜旭[1] 孙凯 强旭红[1] 白洁[2] JIANG Xu;SUN Kai;QIANG Xuhong;BAI Jie(College of Civil Engineering,Tongji University,Shanghai 200092,China;Engineering Research Institute of China Construction Eighth Engineering Division,Shanghai 200122,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]中国建筑第八工程局有限公司工程研究院,上海200122

出　　处：《湖南大学学报（自然科学版）》2022年第9期42-50,共9页Journal of Hunan University:Natural Sciences

基　　金：国家重点研发计划资助项目(2020YFD1100400);广东省重点领域研发计划资助项目(2019B111106002);中建股份科技研发计划资助项目(CSCEC-2020-Z-1);上海市科技计划资助项目(20DZ2253000);上海市自然科学基金资助项目(21ZR1466100);朔黄铁路发展有限责任公司科研项目(SHGF-18-50)。

摘　　要：为明确FRP桥面板与钢梁之间胶接连接的力学性能,针对不同拉剪组合荷载下胶接连接的力学性能进行了系列试验研究,包括极限破坏荷载、破坏模式、刚度以及强度破坏准则.针对胶接连接的受力特点,通过特制的圆盘加载试验装置,实现了6种不同比例的拉伸和剪切荷载组合.结果表明,在纯剪切荷载下,胶接连接在靠近钢梁位置的胶黏层内发生破坏.在拉伸荷载和四种拉剪组合荷载下,节点的破坏模式为FRP层间破坏与FRP夹心板和胶黏层之间界面破坏的组合.荷载-位移曲线表明,胶黏层内胶体材料分布具有不均匀性,在试验过程中引起了胶接连接的偏心受力及应力重分布.根据矢量分离后的拉应力和剪应力,得到胶接连接的拉剪强度破坏准则.In order to reveal the mechanical properties of the adhesively-bonded join between fiber-reinforced polymer(FRP)bridge deck and steel beam,the mechanical behavior of adhesive joints under different tensile/shear combination loads was studied experimentally,including ultimate failure loads,failure modes,stiffness as well as strength failure criterion.Considering the mechanical characteristics of adhesively-bonded joint,six different load combinations of tensile and shear were achieved through a special test device.The results showed that under the pure shear loading,the failure of adhesive joints occurring in the adhesive layer was a cohesive failure at a location close to the steel support.Under the tensile and four combined loading conditions,the failure mode was the combination of fiber breaking(or FRP delamination)and interfacial adhesion failure between the FRP sandwich deck and adhesive layer.Load-deformation curves indicated that the non-homogeneous characteristic of the adhesive layer was evident,which induced the eccentric loading on the adhesive joints and stress redistribution during the test process.Accord⁃ing to the vectorially separated tensile and shear stress,the tensile-shear strength failure criterion of the adhesive joint was addressed.

关 键 词：胶接连接 拉剪组合 破坏模式 桥面板 强度准则 

分 类 号：U448.38[建筑科学—桥梁与隧道工程]