开孔方式对钢板拉压屈服阻尼器耗能的影响

Influences of Perforation Forms on Energy Dissipation for Damper with Tension and Compression Yielding of Stell Plate

针对现有金属阻尼器多利用钢材剪切、弯曲耗能形式等,提出了一种基于开孔钢板拉压屈服的装配式耗能阻尼器。该耗能阻尼器由开孔核心钢板、梯形约束钢板等构造组成。采用低周反复加载试验方法,对3组具有不同开孔形式的耗能核心板的阻尼器力学性能进行研究,同时采用Abaqus有限元程序对试件进行数值模拟,分析了核心板不同开孔形式时阻尼器耗能变化规律。结果表明:该阻尼器构造组成合理,滞回曲线饱满;耗能核心板的开孔方式不同,其破坏模式亦有所不同;当核心板腰间两侧圆孔中心之间的距离与核心板宽度比值为0.43时核心板的滞回耗能性能与骨架曲线较优,最大加载位移可达到屈服位移的约30倍。

In view of the cases that most of the existing metal dampers achieve the energy dissipation by shearing and bending of steel plate, a fabricated energy dissipation damper based on the tensile and compression yielding of the perforation steel plate is proposed. The energy dissipation damper is composed of perforation core steel plates, trapezoidal restrained steel plates and other elements. The low-cycle loading test method is used to study the mechanical performances for three groups of dampers with different perforated forms of energy-consuming core plates. Moreover, the finite element simulation is carried out to study the mechanical performances of specimens with Abaqus software, and the energy consumption changes of the dampers under different perforated forms of the core plate are analyzed. The results show that the structures of the damper is reasonable and the hysteretic curve is full;the failure modes of energy dissipation core steel plates are different with different opening modes of core plates;when the ratio of the distance between the center of circular holes on both sides of the core plate waist to the width of the core plate is 0.43, the hysteretic energy dissipation performance and skeleton curve of the core plate can be better, and the maximum loading displacement can reach about 30 times of the yield displacement.