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提出了一种具有大变形能力的新型转动式铅剪切阻尼器,阐述了其基本构造和耗能原理。通过低周往复荷载试验,研究了不同位移行程工况下该阻尼器的滞回耗能性能;利用有限元软件ABAQUS建立了该阻尼器的实体模型,模拟了低周往复荷载作用下该阻尼器的滞回特性,分析了铅块长度、高度和厚度等参数对其耗能性能的影响。性能试验及有限元分析结果表明:新型转动式铅剪切阻尼器滞回曲线基本呈矩形,且阻尼力稳定;阻尼器的阻尼力随剪切铅块长度和宽度的增加而增大;铅块厚度对阻尼器屈服力的影响较小,但在铅块长厚比不大于5的范围内,厚度越大,阻尼器进入屈服阶段时的位移越小。
A new type of rotary lead shear damper with large deformation capacity is proposed. Its basic structure and energy dissipation principle are expounded. The hysteretic energy dissipation performance of the damper under different displacement and stroke conditions was studied by the low-cycle reciprocating load test. The damper's solid model was established by the finite element software ABAQUS. The damper The hysteresis characteristics of the lead block were analyzed. The influence of the lead block length, height and thickness on its energy dissipation performance was analyzed. The results of the performance test and the finite element analysis show that the hysteresis curve of the new type rotary lead shear damper is basically rectangular and the damping force is stable. The damping force of the damper increases with the length and width of the shear lead. The thickness has little influence on the yield strength of the damper, but the greater the thickness is, the smaller the displacement of the damper when it enters the yielding stage is.