松动残损下箍头榫节点抗震性能试验研究  

Experimental study on seismic behavior of Gutou mortise-tenon joint with loose damage

作　　者：常鹏[1,2] 冯秋歌 韩乐 杨娜[1,2] CHANG Peng;FENG Qiuge;HAN Le;YANG Na(College of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing's Key Laboratory of Structural Wind Engineering and Urban Wind Environment,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京交通大学结构风工程与城市风环境北京市重点实验室,北京100044

出　　处：《建筑结构学报》2023年第10期86-96,共11页Journal of Building Structures

基　　金：中央高校基本科研业务费专项资金资助项目(2022JBZY008);国家自然科学基金项目(51878034,51778045);高等学校学科创新引智计划(B13002)。

摘　　要：为研究不同松动残损类型及不同松动残损程度对单向箍头榫节点抗震性能的影响,对6个缩尺比例为1∶3的单向箍头榫节点进行低周往复荷载试验,得到节点的破坏形态、弯矩-转角滞回曲线、骨架曲线、承载力和刚度退化规律、转角延性系数、耗能能力与柱头滑移曲线等抗震性能指标。研究结果表明:箍头榫节点的破坏模式分为柱内侧梁榫受压破坏、柱头受剪撕裂破坏及节点转角过大三种;各节点的弯矩-转角滞回曲线存在不同程度的捏缩现象且正负方向不对称;松动残损类型对承载力退化系数影响不明显,节点的极限弯矩、割线刚度退化系数以及耗能随松动残损程度的增大而减小,转角延性系数和等效黏滞阻尼系数随松动残损程度的增大而增大。卷杀和箍头的存在使构件在地震时形成类侧脚机制,可增强木构架的内聚力,防止木构架在大变形下倒塌。存在松动残损的榫卯节点对古建筑整体受力性能影响较大,对于发生该类型残损的榫卯节点应及时进行修缮与加固。In order to study the influence of different types and degrees of loose damage on the seismic performance of unidirectional Gutou mortise-tenon joint,six unidirectional Gutou mortise-tenon joint specimens were made with a scale of 1∶3.The low cyclic loading test was carried out on the joint specimens,and the failure patterns,moment-rotation hysteretic curves,skeleton curves,bearing capacity and stiffness degradation laws,angle ductility coefficients,energy dissipation capacity and slip curves of column head were studied.The results indicate that the failure patterns of Gutou mortise-tenon joint can be divided into three types:compression failure of the internal beam mortise,shearing tear failure of the column head and excessive joint rotation.The moment-rotation hysteretic curves of each joint are pinched in different degrees and the positive and negative directions are not symmetrical.The type of loose damage has no obvious effect on the degradation coefficient of bearing capacity of joints.The ultimate bending moment,secant stiffness degradation coefficient and dissipated energy of the joints decrease with the degree of loose damage.The equivalent viscous damping coefficient and angle ductility coefficient increase with the degree of loose damage.The existence of Juansha and Gutou makes the component form a Cejiao mechanism during an earthquake,thereby strengthening the cohesion of the frame and preventing the wooden frame from falling apart.The loose damage of mortise-tenon joints has a great influence on the overall mechanical properties of ancient buildings,and such joints should be repaired and strengthened in time.

关 键 词：箍头榫节点 松动残损 低周往复荷载试验 抗震性能 

分 类 号：TU366.2[建筑科学—结构工程] TU317.1