摘要
以连接件类型、栓钉直径及数量等为参数,完成了19个推出试验,测试了界面破坏形态、荷载-滑移曲线、荷载-应变曲线等内容,分析了栓钉与黏结剂的抗剪组合作用与滑移机理,建立了抗剪承载力计算方法和抗剪-滑移预测模型。试验结果表明:栓黏混合连接试件的荷载-滑移曲线大致分为弹性段、黏结失效下降段、弹塑性段和栓钉剪断下降段;在黏结剂失效前,荷载主要由黏结剂承担,栓钉作用较小,该阶段与全黏结剂试件相似;黏结剂失效后,栓钉继续承受荷载作用,其弹塑性阶段及下降段与全栓钉试件相近;破坏模式表现为黏结剂与钢板界面脱黏,沿剪力槽下缘发生撕裂破坏,栓钉均表现为根部剪断;考虑栓钉与黏结剂组合作用,所建立的抗剪承载力计算方法,其计算值与试验值的比值为0.93,方差为0.13,可较为准确地预测栓黏混合连接的抗剪承载力;当栓钉与黏结剂的承载比为2.26~4.91时,栓黏混合连接钢-超高性能混凝土(UHPC)板界面抗剪性能主要由栓钉决定,黏结剂失效后,在不降低抗剪刚度的同时可提供一定的承载力储备;根据栓黏混合连接件抗剪滑移机制所建立的黏结剂失效前的指数函数预测模型和黏结剂失效后的反比例函数预测模型,可供实际工程参考。
With the type of connectors and the diameter and number of headed studs as the parameters,19 push-out tests were conducted.The interface failure mode,load-slip curve,and load-strain curve were investigated.The shear combination effect and slip mechanism of headed studs and adhesives were analyzed,and the method for calculating the shear bearing capacity and the shear-slip prediction model were established.Test results show that the load-slip curve of the specimen with hybrid connection of headed stud and adhesive can be divided into elastic section,descending section(adhesive failure),elastic-plastic section,and descending section(stud fracture failure).The adhesive primarily bears the load before the adhesive failure,and the headed stud has little effect,which is similar to the specimen with the fully adhesive connection.After adhesive failure,the load is resisted by the headed studs,exhibiting an elastic-plastic section and descending section similar to the specimen with fully headed stud connection.The failure mode is characterized by debonding of adhesive from the steel slab interface,with tearing occurring along the lower edge of the shear pocket.The headed studs are all characterized by shear failure at the base.For the calculation method of shear bearing capacity established in consideration of the synergistic effect of the headed stud and adhesive,the ratio of the calculated value and the experimental value is 0.93,with a variance of 0.13,indicating that the method can predict the shear bearing capacity of the hybrid connector with reasonable accuracy.The interface shear performance of the steel-ultra-high performance concrete(UHPC)slab with hybrid connection of headed stud and adhesive is mainly determined by the headed stud,when the shear bearing capacity ratio of headed studs to adhesives is 2.26-4.91.A certain bearing capacity reserve without reduction in the shear stiffness can be provided when the adhesive fails.According to the shear-slip mechanism of the hybrid headed stud-adhesive connector,the models for exponential function prediction before adhesive failure and for inverse proportional function prediction after adhesive failure were established.They can provide reference for practical projects.
作者
李聪
毛庆超
胡文旭
陈宝春
LI Cong;MAO Qing-chao;HU Wen-xu;CHEN Bao-chun(School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,Fujian,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,Fujian,China)
出处
《交通运输工程学报》
北大核心
2025年第5期278-296,共19页
Journal of Traffic and Transportation Engineering
基金
国家重点研发计划(2018YFC0705400)
中国博士后基金特别资助项目(2023T160138)
福建理工大学科研启动基金(GY-Z23239)
福建省教育厅中青年教育科研项目(科技类)重点项目(JZ240040)。
