ABSTRACT

A self-centering viscous-hysteretic device (SC-VHD), composed of a viscous damper and ring springs in parallel, which combines velocity-proportional viscous energy dissipation and displacement-proportional hysteretic energy dissipation is studied. To evaluate the seismic behavior of structures with self-centering viscous-hysteretic devices and obtain appropriate parametric combinations between the main structure and the added self-centering viscous-hysteretic devices, a parametric study was conducted on SDOF elastoplastic structures with SC-VHDs. The results show that the SC-VHD can reduce about 30–50% of peak displacement and more than 80% of residual deformation, whilst a small increase in peak acceleration was observed. The reduction of the residual deformation is mainly influenced by the ring springs damping ratio and the ratio of preload to structural yielding strength, while the reduction of the peak displacement is significantly influenced by the viscous damping ratio and the ratio of loading stiffness to structural elastic stiffness. When the SC-VHD was designed with a viscous damping ratio of no less than 5%, a ring springs damping ratio of 15% at most, a ratio of preload to yielding strength of no less than 0.1 and a ratio of loading stiffness to elastic stiffness of no less than 0.1, the 2% peak drift and 0.2% residual drift criteria can be satisfied. Based on the parametric analysis results and an improved equivalent damping model parallel to ASCE 7, a displacement-based design method of SDOF elastoplastic structure was then proposed and evaluated by comparison with nonlinear time-history history analysis results.

摘要

研究了一种由粘性阻尼器和环形弹簧并联组成的自定心粘性滞回装置（SC-VHD），它结合了速度-比例粘性耗能和位移-比例滞回耗能。为了评估具有自定心粘性滞回装置的结构的抗震性能，并在主结构和附加的自定心粘性滞回装置之间获得适当的参数组合，对具有 SC-VHD 的单自由度弹塑性结构进行了参数化研究。结果表明，SC-VHD 可以减少约 30-50% 的峰值位移和 80% 以上的残余变形，同时观察到峰值加速度的小幅增加。残余变形的减小主要受环弹簧阻尼比和预紧力与结构屈服强度比的影响，而峰值位移的减小受粘性阻尼比和加载刚度与结构弹性刚度比的显着影响. SC-VHD设计时粘性阻尼比不小于5%，环形弹簧阻尼比最多为15%，预紧与屈服强度比不小于0.1，加载刚度与弹性比不小于0.1刚度不小于 0.1，可以满足 2% 的峰值漂移和 0.2% 的残余漂移标准。基于参数分析结果和与 ASCE 7 平行的改进等效阻尼模型，