带骨式削弱弯曲型耗能梁K形偏心支撑框架抗震性能研究

为提高弯曲型耗能梁塑性变形能力，提出一种带骨式削弱的弯曲型耗能梁K形偏心支撑结构。采用数值模拟方法研究削弱起点a、削弱深度c及耗能梁加劲肋间距等关键设计参数对带骨式削弱的弯曲型耗能梁K形偏心支撑结构抗震性能的影响，对比削弱模型与Base模型之间的承载能力、刚度及耗能能力等性能指标。结果表明，当削弱起点a取值在2h_f～3h_f之间、削弱深度c取值在2t_f～4t_f之间及加劲肋间距为0.7b_f左右时，削弱模型与Base模型各性能指标相差不大。带骨式削弱设计及加劲肋间距能够使耗能梁端部翼缘更大区域出现弯曲塑性变形，提升耗能能力，为后续进行弯曲型偏心支撑结构抗震性能研究提供参考。

Study on seismic behaviour of K-eccentrically braced steel frame with dog-bone reduced flexural link

In order to improve the plastic deformation capacity of flexural links, a K-eccentrically braced steel frame structure with the dog-bone reduced flexural link was proposed. The effects of the key parameters, such as the weakening starting point a and the weakening depth c, as well as the link spacing of the stiffeners on the seismic performance of the K-eccentrically braced steel frame structure were investigated by numerical simulations. The load carrying capacity, stiffness and energy dissipation capacity between the weakened model and the Base model were compared. The result shows that the weakening starting point a is in the range of 2hf to 3hf, the weakening depth c is in the range of 2tf to 4tf, and the spacing between stiffener is about 07bf, indicating that the difference between the performance of the weakened model and the Base model is not significant. The proposed dog-bone reduced design and the link spacing of the stiffeners can lead to bending plastic deformation in a larger area of the link, so that the energy-dissipating capacity of link is improved, which has some reference value for further study of flexural eccentrically braced steel frame in seismic performance.