复合铅芯阻尼器减震性能研究及在剪力墙结构中的应用

Study on Seismic Performance of Composite Lead-Viscoelastic Dampers and Its Application in Shear Wall Structures

剖析复合铅芯阻尼器的构成、作用机理与特点,对两个复合铅芯阻尼器进行了低周循环往复加载试验,试验结果表明,复合铅芯阻尼器屈服位移小,滞回曲线饱满,具有较大的耗能能力和较好的耐疲劳性能,采用双线性模型模拟阻尼器的力学性能偏保守,但对整体结构分析而言偏安全。最后将复合铅芯阻尼器首次应用在高烈度区山地高层剪力墙结构中,对附加复合铅芯阻尼器的高层剪力墙结构的耗能表现与减震性能进行了考察,分析结果显示,在多遇地震下,复合铅芯阻尼器使结构X向和Y向的层间剪力平均值分别降低了11.3%和15.6%,在罕遇地震下,复合铅芯阻尼器耗能占比达12%,阻尼器滞回曲线饱满,能够有效耗散地震输入能量和降低主体结构损伤,满足规范“大震不倒”的性能要求。

This paper analyzed the composition,mechanism and characteristics of composite lead-viscoelastic dampers firstly,and two composite lead-viscoelastic dampers for low cyclic loading test were carried out,the test results show that the composite lead-viscoelastic dampers has small yield displacement,full hysteresis curves,large energy dissipation capacity and good fatigue performance,and the mechanical properties of the damper can be described conservatively by bilinear model,which is safe for overall structural analysis.Finally,composite lead-viscoelastic dampers were applied to high-rise shear wall structures in mountainous areas with high intensity for first time,and the energy dissipation performance and damping performance of the structures with composite lead-viscoelastic dampers were investigated.Under frequent earthquakes,the structure with composite lead-viscoelastic dampers reduced the average inter-story shear forces by 11.3%and 15.6%in the X and Y directions,respectively.Under rare earthquakes,the energy consumption of the composite lead-viscoelastic dampers accounts for 12%.The hysteresis loop of the damper is full,the dampers can effectively dissipate seismic energy and reduce the damage of the main structure.The structure with dampers meets the performance requirements of the specification no collapse under rare earthquakes.