高温下植筋式后锚固群锚的抗剪性能试验研究  

Experimental Study on Shear Performance of Group Anchors Post-installed Adhesive Connection under High Temperature

作　　者：于洪军 李凌志[1] 陆洲导[1] 苏磊[1] YU Hongjun;LI Lingzhi;LU Zhoudao;SU Lei(Department of Disaster Mitigation for Structures,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学结构防灾减灾工程系,上海200092

出　　处：《结构工程师》2021年第3期97-104,共8页Structural Engineers

基　　金：国家自然科学基金(51778496,51778497);国家自然科学基金青年基金(51408436);同济大学实验教改项目(0200104455)。

摘　　要：为研究植筋式后锚固群锚在高温下的抗剪性能,对16个群锚试件进行常温和高温下的剪切试验,得到了不同高温条件下试件内部的温度场,总结了各试件的破坏模式,分析了群锚的边距、间距和温度对其抗剪承载力、抗剪刚度和延性的影响。结果表明:常温下,群锚试件的边距大于8d、间距大于16d可以使得试件性能得到充分发挥;随温度升高,破坏模式由后排锚栓剪断向混凝土破坏转变。高温会使得群锚承载力和刚度大幅降低,位移延性和等效能量延性显著增大。In order to study the shear performance of group anchors post-installed adhesive connection under high temperature,shear tests of group anchors at normal temperature and high temperature were carried out for 16 specimens with group anchors.Temperature fields inside the specimens under different high temperature conditions were calibrated.Failure modes of the specimens were summarized,and the influence of embedment length,spacing and temperature on the shear bearing capacity,shear stiffness and ductility of the group anchors was obtained.The results showed that the performance of group anchors can be fully utilized when edge distance is greater than M and spacing is greater than 16d at room temperature.As temperature increases,the failure mode changes from rear bolt fracture to concrete failure.High temperature can greatly reduce the bearing capacity and stiffness of the group anchors,and significantly increase the displacement ductility and equivalent energy ductility.

关 键 词：高温 植筋式后锚固连接 群锚 抗剪性能 

分 类 号：TU317[建筑科学—结构工程]