钢铅粘弹性阻尼器试验研究

研制开发了一种钢铅粘弹性阻尼器,介绍了该种阻尼器的构造、耗能机理及特点,设计出钢铅粘弹性阻尼器试验模型,利用压剪试验机完成阻尼器试验模型在不同幅值下的低周反复荷载试验,采用Bouc-Wen模型和双线性模型模拟了钢铅粘弹性阻尼器的滞回性能。研究结果表明:1)钢铅粘弹性阻尼器滞回曲线光滑饱满,具有良好的耗能性能;2)铅芯、钢芯和粘弹性材料在剪切变形过程中发挥了良好作用,提高了阻尼器水平剪力、初始刚度和耗能能力;3)阻尼器在大变形过程没有出现粘弹性材料外鼓和撕裂现象,并能恢复到原始加载位置,其具有较好的大变形能力和自恢复性能;4)Bouc-Wen模型、双线性模型模拟的滞回曲线与试验滞回曲线吻合的较好,分析时采用Bouc-Wen模型、双线性模型模拟阻尼器的滞回性能是可行的。

EXPERIMENTAL STUDY ON STEEL-LEAD VISCOELASTIC DAMPER

A new type steel-lead viscoelastic damper is developed,and its principle,configuration,characteristics are illustrated.The new type steel-lead viscoelastic damper model is tested under slow reversed cyclic horizontal loads.The non-linear hysteretic behavior of the SLVD is modeled to adopt the Bouc-Wen model and bilinear model.The results show that: 1) hysteretic curve of the steel-lead viscoelastic damper is slippery,and has good seismic energy dissipation capabilities;2) the lead core,steel core and viscoelsatic material plays an important part in energy dissipation of shear deformation,which can obviously increase the horizontal shear force,initial-stiffness and energy dissipation ability of the SLVD;3) the SLVD has no tear and creak phenomenon of the viscoelastic material in a large displacement case,and can recovery the initial position.It has good self-recovery function and large deformantion performance;4) the simulating hysteretic curves with Bouc-Wen model and bilinear model are identical to the test results,it is feasible to adopt the Bouc-Wen model and bilinear model to simulate the damper element in the analysis of a structure with the SLVD.