装配式钢质耗能铰连接中开孔削弱钢板阻尼器滞回性能研究

提出一种装配式节点钢质耗能铰连接，对其关键部件开孔削弱钢板阻尼器，进行3种开孔削弱形式的试件轴向往复加载试验，考察开孔削弱钢板阻尼器的破坏模态，研究其滞回性能、骨架曲线、承载能力与延性性能等。探讨开孔削弱长度、开孔削弱宽度、宽厚比、厚度方向间隙等参数对钢板阻尼器滞回性能的影响。建立开孔削弱钢板阻尼器的简化力学模型，提出阻尼器滞回本构模型并对本构模型准确性进行验证。结果表明，阻尼器的开孔削弱钢板在开孔削弱处开裂或断裂，避免了面外屈曲的发生，实现塑性耗能与破坏模式可控；阻尼器滞回曲线饱满，承载力均高于297.31 kN，位移延性系数Δ/Δy均大于4.5，表现出良好的耗能能力、承载能力与延性性能；相比菱形开孔，竖缝开孔削弱阻尼器综合力学性能更优，建议开孔削弱长度a/L为0.25～0.55，开孔削弱宽度b/B为0.2～0.5，宽厚比为12.50～15.63，厚度方向间隙不超过2 mm；提出的开孔削弱钢板阻尼器滞回本构模型能准确地模拟阻尼器滞回性能。

Hysteretic performance of hole-opened weakened steel-plate damper in prefabricated energy-dissipating steel-hinge connection

In this paper, an energy-dissipating steel-hinge connection in a prefabricated joint was proposed, in which hole-opened weakened steel-plate dampers were its key parts. The axial reciprocating loading tests were conducted on three different hole-opened weakened dampers to investigate the failure mode, the hysteretic performance, skeleton curve, bearing capacity as well as the ductility. Then the effects of the weakened length and width of the hole, the width-thickness ratio, and the thickness direction gap on the hysteretic performance of the steel-plate damper were discussed. In addition, a simplified mechanical model of the weakened steel-plate damper was established to derive the hysteretic constitutive model which was verified by the experimental results. The results show that the weakened steel plate of the damper cracks or breaks at the hole-opened part, avoiding out-of-plane buckling and achieving the controllability of plastic energy dissipation and failure mode. The hysteresis curve of the dampers is full, the bearing capacity is higher than 297.31 kN, and the displacement ductility coefficient is greater than 4.5, showing good energy dissipation capacity, bearing capacity and ductility performance. Compared with diamond-shaped openings, the vertical slot-opening damper has better overall mechanical properties. It is also recommended that the weakened length a/L of the hole is from 0.25 to 0.55, the weakened width b/B is from 0.2 to 0.5, the width-to-thickness ratio is from 12.50 to 15.63, and the gap in the thickness direction cannot exceed 2 mm. The proposed hysteretic constitutive model can accurately simulate the hysteresis performance of the hole-opened weakened steel-plate damper.