摘要
为研究高温后铝合金T型连接梁柱节点滞回性能,以温度值、恒温时间为变化参数,设计了4个T型节点试件进行了高温后低周往复加载试验。通过试验观测了T型节点试件的破坏过程,同时获取了试件升温曲线、滞回曲线、骨架曲线、延性指标、承载力及刚度退化曲线等,并由此分析了节点破坏机理、承载能力以及抗震性能。试验结果表明:受到低周往复荷载作用后试件的破坏模式均表现为节点板的弯剪破坏,滞回曲线不饱满;高温后试件极限承载力随着恒温时间的增加而减少;与常温下的铝合金T型节点试件相比,经历高温后的试件刚度退化幅度及延性增加;螺栓滑移可增加试件耗能,但摩擦力在滑移阶段初期对常温试件产生不利影响。
In order to study the hysteretic performance of the aluminum alloy T-shaped beam-column joints after exposure to high temperature.Cyclic load tests of four T-joints at different temperatures and temperature exposure times were designed and carried out.The experimental phenomena and modes of failure were recorded.The temperature rise curve of specimen,hysteretic curve,skeleton curve,ductility index,bearing capacity and stiffness degradation curve were obtained.The failure mechanism,bearing capacity and seismic performance of the joint were analyzed.The experimental results indicate that the failure modes of the specimens under cyclic loading are bending shear failure of the gusset plate,and the hysteresis curve is not saturated.The ultimate bearing capacity of specimens after exposure to high temperature decreases with the increase of exposure time.Compared with the aluminum alloy T-joint specimens at room temperature,stiffness degradation and ductility of specimens after exposure to high temperature increase.Bolt slip increases energy dissipation of specimens,but the friction has an adverse effect on the specimen at room temperature at the beginning of the slip stage.
作者
张易申
谢开仲
谢臻
彭林欣
ZHANG Yishen;XIE Kaizhong;XIE Zhen;PENG Linxin(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of China Ministry of Education,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Nanning 530004,China)
出处
《建筑结构》
北大核心
2024年第10期65-72,共8页
Building Structure
关键词
铝合金
梁柱节点
滞回性能
高温
T型节点
aluminium alloy
beam-column joint
hysteretic performance
high temperature
T-joint
