带变截面可更换耗能梁段的高强钢框架-偏心支撑有限元参数分析

提出了一种新型变截面可更换耗能梁,控制塑性变形集中在耗能区域中,通过扩大截面与框架梁采取翼缘和腹板螺栓拼接连接,易于实现螺栓弹性设计,减小螺栓滑移,完成耗能梁端在地震作用后的更换。利用变截面可更换耗能梁段中部区域耗能集中与塑性变形优越的特性,结合高强钢的较大弹性变形,在偏心支撑钢框架中设置变截面可更换耗能梁段,形成带变截面可更换耗能梁段的高强钢框架-偏心支撑结构体系,通过有限元软件模拟验证了已有端板连接可更换耗能梁段试验,对比破坏模式、承载能力与耗能特性,以此为基础,建立了带变截面可更换耗能梁段的高强钢框架-偏心支撑结构有限元模型,通过循环加载研究了结构的承载能力、刚度、受力特点、塑性转角和塑性分布等受力机理。考虑了中间耗能区域长度(e)、钢材牌号组合和变截面可更换耗能梁段长度(e'')三个参数变化对结构抗震性能的影响规律。

Finite parametric analysis of high-strength steel eccentrically braced frame with corrugated replaceable link

This paper proposed a new type of corrugated replaceable links and the plastic deformation is isolated in the links,and the flange and web bolt splicing connection with the frame beam by expanding the section,which is easy to realize the bolt elastic design,reduce the bolt slippage,and facilitate the link replacement after an earthquake.By setting a new type of variable section replaceable link in the eccentrically braced steel frame,combining the large elastic deformation range of high strength steel with the superior plastic deformation of the new type of replaceable link,a high strength steel eccentrically braced frame with variable section replaceable link is formed,and the ABAQUS software is used to simulate and verify the existing end plate connection replaceable link test specimen.The finite element model of the high strength steel eccentrically braced frame with variable section replaceable links was established,and the bearing capacity,stiffness,plastic rotation,plastic distribution and other force mechanisms of the structure were studied by cyclic loading.The effect of the variation of three parameters,namely the length of energy dissipation region (e),the combination of steel strength and the length of replaceable link (e''),on the seismic performance of the structure is considered.