可恢复功能装配式中柱节点耗能装置试验研究

Experimental study on energy consuming devices for earthquake-resilient prefabricated cross joints

基于损伤控制及滑移耗能等思想,提出了两种震后功能可快速恢复的装配式中柱节点耗能装置。对三个节点试件和一个修复件进行了低周往复荷载试验及疲劳加载试验,获得节点的滞回曲线、刚度退化曲线、主体梁段的应变分布曲线等性能指标,考察了腹板连接件形式对节点滞回性能的影响。结果表明,提出的两类装配式钢结构中柱节点均具有良好的承载性能、耗能能力、延性及塑性转动能力;更换连接盖板等耗能构件的修复方案切实可行,且修复前后的节点耗能性能稳定,可作为一种位移相关型阻尼器使用;腹板连接件的形式对节点整体的承载能力及初始刚度影响较小,但会影响节点的转动能力和主体梁的应力、应变情况。

Based on the ideas of damage control and slip based energy dissipation,two types of earthquake-resilient prefabricated cross joints were proposed in this paper.Low frequency cyclic loading tests and fatigue tests of three specimens and one repaired specimen were carried out to investigate the influence of the forms of web connector on the hysteretic behavior of these joints.Through this series of tests,several seismic behavior indicators such as the hysteresis curve,stiffness degradation curve and strain distribution on main components were obtained.The test results show that the proposed two types of prefabricated cross joints have excellent bearing capacity,energy dissipation capacity,ductility and plastic rotation capacity.The scheme of replacing the energy-consuming components such as the flange cover plates is applicable,since the energy dissipation capacity of the joints before and after the repair is stable,which can be used as a displacement-related damper.The forms of the web connectors have little influence on the bearing capacity and initial stiffness of the joint,but have a great influence on the joint rotation capacity and the stress of main beams.