设置垫板的梁柱T形件连接节点抗震性能试验研究  

Experimental investigation of seismic behavior of beam-to-column T-stub connected joints with inserted plates

作　　者：吴兆旗[1] 苏建强[1] 姜绍飞[1] 费晓晖[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《建筑结构学报》2012年第12期10-19,71,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51008081);中国博士后科学基金项目(20100470867);福建省自然科学基金项目(2010J05113)

摘　　要：针对传统钢结构梁柱连接在地震中易脆性破坏,改进连接震后不易修复等问题,提出设置垫板的梁柱T形件连接构造措施。设计、制作3个不同形式的梁柱T形件连接试件,分别为未设置混凝土板的连接节点、设置混凝土板的连接节点和未设置混凝土板的传统梁柱T形件连接节点,对其进行往复荷载作用下的拟静力试验,研究试件的抗弯刚度、承载力、延性、滞回性能、耗能能力、破坏模式等。此外,更换梁下部翼缘处已破坏的T形件进行修复,并对修复后的试件进行拟静力试验。结果表明:设置垫板的T形件连接节点在往复荷载作用下具有稳定的滞回性能和良好的耗能能力;破坏试件的梁、柱均不发生屈服,转动中心位于梁端上部翼缘附近,能够保证在地震作用下梁端上部翼缘连接部位不发生破坏,并能够保护梁上混凝土楼板不发生较大的损坏;混凝土楼板的存在会提高节点正弯矩下的初始刚度和承载力,并使弯曲中性轴上移;更换梁下部翼缘处已破坏的T形件进行修复,修复后试件的滞回性能与原试件无明显差异。This paper proposes an innovative beam-to-column T-stub connection with inserted plates to overcome the problems that the traditional connections are prone to brittle failure and the improved ones are not convenient to repair after damage.Three different specimens were designed,fabricated and tested by quasi-static experiments,which included a steel joint without a concrete floor slab,a steel joint with a concrete floor slab and a traditional T-stub connected joint without a concrete floor slab.The seismic behaviors,such as the stiffness,the bearing capacity,the ductility,the hysteretic behavior,the energy dissipation capacity and failure mode,etc.,were studied.Moreover,after repaired by replacing the destroyed bottom T-stub,the joint was tested once again.The results indicate that T-stub connected joints with inserted plates can provide good hysteretic behavior and energy dissipation capacity under a reciprocate load.The beam and column do not yield after the connection failure,and the rotational center of the connection locates near the top of beam flange,which can guarantee that the upper T-stub is not destroyed and the concrete floor slab is protected from severe damage.The concrete floor slab can improve the initial stiffness and capacity of connections under the sagging moment,and make the neutral axis move up.There is no obvious difference in the hysteretic behavior between the undamaged connection and the repaired one.

关 键 词：梁柱连接 T形件连接 垫板 拟静力试验 抗震性能 

分 类 号：TU392.1[建筑科学—结构工程] TU317.1