【摘要】 为研究地震作用下不同饱满度对套筒灌浆接头连接性能的影响,设计四种饱满度半灌浆套筒接头试件进行反复拉压荷载试验。结果表明:随着灌浆饱满度降低,经过反复拉压荷载后试件破坏形式由钢筋拉断向灌浆端钢筋刮犁拔出转变,且抗拉强度降低;灌浆不饱满会增大试件在反复拉压荷载作用后的残余变形,并减小接头的割线拉伸刚度,不利于混凝土结构的裂缝控制,增大地震后连接节点的损坏程度;对于承受高应力反复拉压荷载的试件,由于灌浆饱满度降低,连接滑移增大,其耗能能力略有增强;对于承受大变形反复拉压荷载的试件,随着饱满度降低其耗能能力先增大后减小,接头的安全冗余度有所降低。通过本次试验,验证了施工缺陷造成灌浆不饱满会削弱半灌浆接头的连接性能,对连接节点在地震作用下的安全性造成隐患。更多还原

【Abstract】 In order to study the influence of different fullness on the connection performance of sleeve grouting joint under earthquake action, four grades of grouting fullness of half thread end grouted splicing specimens were designed for reversal loading. The results show that with the decrease of grouting fullness, under reversal load, the failure mode of specimens transform from the steel bar fracture to the grouting end pull-out, and the tensile strength will decrease. Under reversal load, the reduction of grouting fullness leads to increasing the residual deformation and reducing the tangential tensile stiffness of the specimens which is harmful to control of the cracks in concrete structure and increases the degree of damage in the joint areas after the earthquake. For the specimens subjected to high stress reversal load, the capacity of energy consumption increases slightly due to the decrease of grouting fullness and the increase of the slip; for the specimens subjected to large strain reversal load, the capacity of energy consumption reaches the limit in advance due to the decrease of grouting fullness, which reduces the safety redundancy of the splicing. It is verified by the experiment that the construction defects weaken the connection performance of the half thread end grouted splicing and danger to the safety of the joint under earthquake.更多还原