双向剪切阻尼器设计及力学性能研究

Design and mechanical properties of bidirectional shear dampers

现有钢板剪切阻尼器使用普通钢板或低屈服点钢材,利用板材平面内的抗剪性能实现所需的刚度、屈服承载力、延性耗能等。其构造和工作机理决定了剪切方向唯一性。现研究一种新型双向剪切阻尼器,采用的弯剪钢筋或钢棒的截面为圆形,在受剪时几乎不存在方向性差异,在双向地震作用下,结构和构件发生受扭等情况下均可正常发挥金属的耗能作用。通过试验和有限元分析探究双向剪切阻尼器工作机理、力学性能及耗能能力,结果表明相比于钢板剪切阻尼器,可实现双向剪切耗能,能够适用于受力条件更为复杂的工程。

The existing steel plate shear damper uses ordinary steel plate or low yield point steel,and uses the shear performance of the plate in the plane to achieve the required stiffness,yield capacity,ductility energy consumption and so on.Its structure and working mechanism determine the uniqueness of shear direction.This paper studies a new type of bidirectional shear damper.The cross-section of the bent shear bar or steel bar is circular,and there is almost no directional difference when shearing.Under the action of bidirectional earthquake,the structure and components can exert the energy dissipation function of metal normally.The working mechanism,mechanical properties and energy dissipation capacity of the bidirectional shear damper are investigated through experiments and finite element analysis.The results show that compared with the steel plate shear damper,the bidirectional shear energy dissipation can be realized and can be applied to the engineering with more complex stress conditions.