腋板加强型节点钢框架抗震性能试验研究

为研究腋板加强型节点空间钢框架抗震性能,对1∶3缩尺腋板加强型节点空间钢框架子结构进行拟静力试验,研究荷载-位移滞回曲线、骨架曲线、抗侧刚度、层间位移角、承载力退化、塑性耗能等抗震性能。试验结果表明：南、北两榀钢框架滞回曲线饱满对称,骨架曲线呈S型,层间位移角在4.29%~5.99%之间;试验过程中8个腋板加强型梁柱节点连接焊缝均未出现开裂,梁端翼缘及腹板塑性变形显著;腋板加强型节点钢框架在循环往复荷载作用下表现出良好的耗能能力,整体结构耗能较为充分;在等幅荷载作用下,南、北两榀钢框架承载力退化系数呈缓慢增长趋势,结构空间协同工作效应在一定程度上提高了钢框架承载能力。

Experimental study on seismic behaviors of steel frames with Haunch Reinforced Section connections

In order to investigate the seismic performance of steel frames with haunch reinforced section joints, a pseudo-static experiment for a 1∶3 scale space steel frame with haunch reinforced section was conducted, including the study on the loading-displacement hysteresis curve, the skeleton curve, the lateral stiffness, the inter-story displacement angle, the bearing capacity degeneration, and the plastic energy dissipation capacity etc. The experimental results show that the loading-displacement hysteresis curves of the southern and northern steel frames comprising the whole space frame are plump and symmetrical, the skeleton curves show Spattern, and the inter-story displacement angles range from 4.29% to 5.99%. No weld cracks emerge at eight haunch reinforced section joints in the experiment, while great plastic deformation appears at the beam flange and web. The steel frame with haunch reinforced section connections exhibits good energy dissipation capacity under cyclic loading, and the energy dissipation is full. Under equal-amplitude loading, the capacity degradation coefficient of the two steel frames increases slowly, and the space collaboration effect to certain extent improves the bearing capacity of the steel frames.