板件弯剪屈服型耗能支撑钢框架结构抗震性能

Seismic Performance of Steel Frame Structures with Braces Dissipated Energy by Flexural-and-shear Yielding Plates

为了研究板件弯剪屈服型耗能部件对钢框架结构抗震性能的影响,通过ABAQUS有限元分析软件建立了一系列带有板件弯剪屈服型耗能部件的双层单跨单斜支撑钢框架结构数值模型,探究了结构的破坏模式以及不同参数对结构的承载能力、耗能能力、支撑与支撑框架结构之间的承载力分配、耗能分配等抗震性能的影响规律。分析结果表明:板件弯剪屈服型耗能支撑钢框架结构主要依靠耗能部件的剪切板和弯曲板先后屈服进入塑性耗散能量;结构滞回曲线饱满,耗能性能良好;加载前期,主要由耗能支撑承担结构的水平承载力和能量耗散,加载中后期,梁与节点板相接的翼缘和柱脚外翼缘出现应力集中现象而进入塑性,耗能支撑的水平承载力和能量耗散占比逐渐降低,但仍大于50%。可见板件弯剪屈服耗能支撑能够较好地分担钢框架结构的承载力和能量耗散,可考虑应用于实际工程。

In order to study the influence of steel dissipators composed of flexural-and-shear yielding plates on the seismic performance of steel frame structures,a series of numerical models of two storey and one span steel frame structures which have diagonal braces were established by ABAQUS.The influence rules of different parameters on the seismic performance of the structure,such as the bearing capacity,energy dissipation capacity,the bearing capacity distribution and the energy consumption distribution between the brace and the braced frame structure,were explored.The result indicates that the steel frame structures mainly dissipated energy by the shear plate and then the bending plates yielding into the plastic stage.The hysteretic curve of the structures are in plump and the energy dissipation performance is excellent.In the early stage of loading,the horizontal bearing capacity and energy dissipation of the structure are mainly borne by the braces.In middle and late stage of loading,the flange connecting the beam with the gusset plate and the outer flange of the column foot appear stress concentration and enter into plasticity,the horizontal bearing capacity and energy dissipation of the energy dissipation brace gradually decrease,but still more than 50%.It is concluded that the plate yield energy dissipation brace can well share the bearing capacity and energy dissipation of the steel frame structure,which can be considered for practical engineering.