钢管叠层黏弹性阻尼器性能研究

Research on properties of laminated viscoelastic body filled steel tube damper

设计钢管空心叠层黏弹性阻尼器、钢管实心叠层黏弹性阻尼器和钢管阻尼器三个试件,对其进行低周往复加载试验和有限元模拟分析,对比研究了三种阻尼器的工作机理、破坏特征和滞回性能。结果表明:钢管空心叠层黏弹性阻尼器和钢管实心叠层黏弹性阻尼器滞回曲线对称且饱满,具有稳定的耗能性能和工作性能,在1mm位移下就可屈服耗能,等效黏滞阻尼比在10%左右,16mm位移时等效黏滞阻尼比大于40%。叠层黏弹性体可与钢管协同工作,使钢管具有较好的防止屈曲的能力,空心叠层黏弹性体和实心叠层黏弹性体始终处于弹性状态。钢管空心叠层黏弹性阻尼器比钢管实心叠层黏弹性阻尼器耗能性能更好,耗能效率更高,材料用量更少。钢管中部削弱可以使阻尼器变形和耗能集中在削弱部位,避免阻尼器端部连接破坏。钢管空心叠层黏弹性阻尼器和钢管实心叠层黏弹性阻尼器力学模型可以简化为双线性模型。

Three specimens,namely the hollow laminated viscoelastic body filled steel tube damper,the solid laminated viscoelastic body filled steel tube damper and hollow steel tube damper,were designed.Based on the specimens,the low-cycle reciprocating loading test and finite element simulation analysis were carried out,so the working mechanism,failure characteristics and hysteretic behavior of the three dampers were studied and compared.The research results show that the hysteretic curves of the hollow laminated viscoelastic body filled steel tube damper and solid laminated viscoelastic body filled steel tube damper appear to be symmetric and full,indicating that they possess stable energy dissipation performance and working performance.For the two dampers,they yielded and dissipated energy even at the displacement of 1mm with the equivalent viscous damping ratio of 10%,while at the displacement of 16mm the equivalent viscous damping ratio was greater than 40%.The laminated viscoelastic body can collaborate with the steel tube,so the steel tube has better resistance to the buckling.After experiencing loading tests,the hollow laminated viscoelastic body and the solid laminated viscoelastic body were still in elastic states.Compared to the solid laminated viscoelastic body filled steel tube damper,however,the hollow laminated viscoelastic body filled steel tube damper has better energy dissipation performance,higher energy dissipation efficiency and less material consumption.Due to the weakening of the middle part of the steel tube,the deformation and energy dissipation may concentrate at the weakened part and the damper damage at the end connection may be avoided.It shall be emphasized that the mechanical model of the hollow laminated viscoelastic body filled steel tube damper and the solid laminated viscoelastic body filled steel tube damper may be simplified to be the bilinear model.