考虑混凝土板组合效应的蜂窝钢梁柱连接抗震性能试验研究

Experimental study on seismic performance of cellular beam column connections considering composite action of floor slab

为了研究混凝土板组合效应对蜂窝梁柱连接抗震性能的影响,对无混凝土板和有混凝土板的正六边形蜂窝梁柱连接、普通组合梁柱连接进行拟静力试验。研究混凝土板组合效应对不同开孔率的蜂窝梁柱连接的破坏形态、承载能力、刚度、延性及耗能能力的影响。试验结果表明:蜂窝梁柱连接可以有效地控制塑性铰在近柱端第一个蜂窝孔处形成,实现塑性铰外移,降低在梁柱连接焊缝处发生脆性破坏的可能性;混凝土板的组合效应可以减小蜂窝梁剪切变形的影响,与无混凝土板的蜂窝梁柱连接相比,有混凝土板的蜂窝梁柱连接的滞回曲线更饱满;混凝土板的组合效应能够提高蜂窝梁柱连接的承载能力、延性、刚度及耗能性能,开孔率越大,组合效应越显著;混凝土板组合效应降低了塑性铰区的转动能力。

In order to investigate the effect of composite action of floor slab on the seismic performance of cellular beam column connections, the hexagon-hole cellular beam column connections with and without composite floor slab and the solid web composite beam column connection were tested under cyclic loading to study the effect of composite action of floor slab on the failure modes, bearing capacity, rigidity, ductility and energy dissipation capacity of composite cellular beam column connections with different opening ratios. The experimental results indicate that the plastic hinge of cellular beam column connections arc generated at the first cellular hole near the column, the plastic hinge is moved away from the column to reduce the possibility of brittle failure at the beam column connection weld. The composite action of floor slab can reduce the effect of shear deformation, and the hysteretic curves of cellular beam column connections with composite floor slab are fuller than those without composite floor slab. The composite action of floor slab can improve the bearing capacity, ductility, stiffness and energy dissipation capacity of cellular beam column connections. With the increase of the opening ratio, the combination effect is more significant, but the composite action of floor slab reduces the rotational capacity of plastic hinge regions.