K型偏心支撑钢框架抗震性能研究

为分析K型偏心支撑框架在低周往复荷载作用下的抗震性能,通过模型试验及仿真试验研究了K型偏心支撑框架的滞回性能、刚度退化现象以及在循环荷载作用下的能量耗散机理.结果表明K型偏心支撑框架在弹性阶段刚度大,在塑性阶段耗能能力强;不同的耗能梁段长度对结构各层的耗能能力有很大的影响,耗能梁段不宜过短也不宜过长；当耗能梁段出现剪切屈服后,刚度出现明显的退化现象,仿真试验验证了试验剪切型梁段的屈服现象.K型偏心支撑框架具有良好的滞回性能和耗能性能,分析结果可供工程设计和相关研究参考.

Seismic Behaviors Research for K-shape Eccentrically Braced Steel Frames

In order to research seismic performance on the K-shape eccentrically frames, model and simulation test methods are used to carry out the seismic performance study to .understand earthquake performance, stiffness degradation and dissipation mechanism of energy. It is con- cluded that K-shape eccentrically frames provide high elastic stiffness and demonstrate excellent energy dissipation capacity; the different length of the link beam of different layers on the energy dissipation capacity of the structure has great i~ffluence. The shorter the link beam is, the larger plastic deformation of it, so it makes plastic collapse easily, while a long link beam has a poor cyclic behavior. When link beam of K-shape eccentrically braced frame occurs shear yielding, stiffness degradation become apparent verified by simulation test. Therefore, K- shape eccentrically frames have better hysteretic behavior and energy dissipation capacity, the results can provide a reference for the engineering design and related research.