圆形截面组合柱-钢梁框架节点反复加载性能试验研究

本文以北京LG大厦塔楼为工程背景,采用6个大尺寸试件,对钢梁和钢骨混凝土圆柱组成的框架节点进行了低周反复加载试验。试件包括按“弱梁强柱强节点”设计和“强梁强柱弱节点”设计两种情况。前者发生梁铰型破坏,节点核心区始终基本完好,试件承载力由梁端承载力控制,延性和耗能均满足要求。后者虽发生节点核心区破坏,但其性能明显好于钢筋混凝土框架节点,能满足抗震基本要求;当轴压比从0.16提高到0.32时,节点核心区强度有所提高;在节点附设柱面承压板(FBP板)可提高承载力、延性和耗能能力。在钢骨上焊接栓钉的构造措施可避免粘结破坏。

Experimental study on the cyclic behavior of composite circular column-steel beam frame joints

6 large-sized specimens of circular-section steel reinforced concrete column-steel beam frame joints were tested under cyclic reversed loading.Two types of specimens,"weak beam-strong column-strong joint" and "strong beam-strong column-weak joint",were studied.For the former,the plastic hinge occurred at beam end,while the joint core had almost no damage.Load-carrying capacities of the specimens were controlled by flexural capacities of steel beams.Ductility and energy-dissipation ability were adequate for the seismic design.For the latter,failure happened within the joint core zone,but the behavior of the specimens was much better than that of the reinforced concrete frame joint and they can satisfy the demands of seismic design on the whole.As the axial compression ratio increased from 0.16 to 0.32,the capacities of the joints increased.By using the face bearing plates on the joint,the load-carrying capacities,ductility,energy-dissipation abilities of the specimens increased.The use of shear studs on the steel could avoid the bond failure.