混合结构T形梁半刚接耗能节点受力性能试验研究

Experimental study on mechanical properties of T-shape beam semi-rigid energy-dissipated joint for steel-concrete hybrid structure

高层钢-混凝土混合结构体系是近年来在高层和超高层结构中应用较为广泛的一种抗侧力体系,在高层钢框架-核心筒混合结构抗震设计中,常常将钢梁-混凝土墙连接节点设计成理想的刚接或铰接。综合刚接节点和铰接节点的优缺点,提出了能满足滑模施工工艺的全栓接新型半刚性节点,并对3个混合结构T形墙梁半刚接耗能节点试件进行了低周往复荷载试验。试验研究表明:该节点可方便地在实际施工过程中实现;节点具有较好的延性性能和一定的耗能能力;影响节点的初始刚度和承载力的主要因素是顶、底角钢的刚度和强度,腹板角钢对其影响较小。顶、底角钢是半刚性节点的关键部件且可拆换,能够满足"中震可修"的抗震性能目标。随着顶、底角钢厚度的增加,节点的屈服弯矩、屈服转角、极限弯矩和极限转角都有明显的增长。

High-rise steel-concrete hybrid structural system is a kind of lateral resistant system that is widely used in highrise buildings and super-tall buildings in recent years. In seismic design of high-rise hybrid structure of steel frame and concrete corewall,concrete wall-steel beam joint is usually designed as ideal rigid joint or hinged joint. Considering advantages and disadvantages of rigid joints and hinged joints,a new type of semi-rigid bolted joints was put forward,which can meet the requirement of slip-form construction of concrete wall. In addition,three T-shaped semi-rigid energydissipated joint tests under low-cyclic loading were conducted. Results show that the joint can be easily realized in the construction. Besides,it has good ductility capacity and energy dissipation capacity. The major factors that influence the initial rigidity and bearing capacity of joints are the rigidity and strength of top and bottom angle steels,while web angle steels have less influence. Top and bottom angle steels,which are the key components of semi-rigid joints and easily to replace,can meet the requirements of the performance-based seismic design goals that buildings can be repaired under the moderate earthquake. With the increment of thickness of top and bottom angle steels,yield moment,yield rotation,ultimate moment and ultimate rotation of the joint obviously increase.