位移放大型黏弹性减震系统力学模型与地震响应分析

Mechanical model and seismic response analysis of large displacement viscoelastic damping system

针对消能减震结构在层间位移较小时耗能效率欠佳的问题,提出了一种可将结构层间位移放大的黏弹性阻尼器,并建立了位移放大型阻尼系统的力学模型,完成了位移放大2.5倍的黏弹性阻尼器和普通黏弹阻尼器的力学性能对比试验,最后通过算例分析探讨了不同减震结构的地震响应。所提出的力学模型与试验结果吻合。位移放大型阻尼器的出力和耗能相比普通阻尼器被有效地放大。多遇地震下,附加位移放大型黏弹性阻尼器减震结构的附加阻尼比显著提升,阻尼耗能是普通减震结构的1.98倍。

For the problem of poor energy consumption efficiency of energy dissipation structures when the interlayer displacement is small,a viscoelastic damper that can amplify the interlayer displacement of the structure is proposed,and the mechanical model of the displacement-amplified damping system is established.A comparative test of the mechanical properties of a viscoelastic damper with a displacement magnification of 2.5 times and an ordinary viscoelastic damper is carried out.The seismic response of different damping structures is analyzed through a calculation example.The proposed mechanical model is consistent with the experimental results.Compared with ordinary dampers,the output and energy dissipation of displacement-amplified dampers are effectively amplified.Under frequent earthquakes,the additional damping ratio of the additional displacement-amplified viscoelastic damping structure is significantly improved,and the damping energy dissipation is 1.98 times that of the ordinary damping structure.