K型偏心支撑钢框架的地震反应分析

Seismic Analysis of K-eccentrically Braced Steel Frame

偏心支撑结构弹性阶段刚度大,塑性阶段耗能能力强,是适用于高烈度地震区的一种有效的抗侧力结构体系。采用梁单元与壳单元相结合的非线性有限元模型,对K型偏心支撑钢框架进行弹塑性时程分析,研究耗能梁段的长度、腹板高厚比和加劲肋间距的变化对K型偏心支撑钢框架结构抗震性能的影响,提出了相应的抗震设计建议。

The paper demonstrates that high elastic stiffness and excellent energy dissipation of eccentricallybraced steel frame is a lateral load-resisting system applied to the building in the high intensity area. The nonlinear finite element model is stimulated by the combination of the shell element and beam element to make elastlc-plastic time history analysis on the K-eccentrically braced steel frames. The paper also investigates the influence of different parameters such as the length of link beam and height-to-thickness ratio of web, as well as the distance of the links stiffness on the seismic behavior of K-eccentrically braced steel frame under the rare earthquake action. Some suggestions are acquired for the structural seismic design.