偏心支撑半刚性连接钢框架的动力特性研究

摘要

将偏心支撑与半刚性连接钢框架相结合是一种新型抗震结构体系,为探讨其动力特性和影响因素,进行了大型试验研究和有限元数值模态分析.结果表明:偏心支撑半刚性连接钢框架的动力特性与传统框架结构并不相同,随着梁柱节点转动刚度的降低,结构自振周期延长,阻尼比增加,我国现行规范的相关规定不适用这种结构体系.最后依据研究结果,提供了偏心支撑半刚性连接钢框架的自振周期简化计算方法和阻尼比参考值.%Semi-rigid steel frame combined with eccentric braces is a new type of seismic structural system. In order to investigate its dynamic characteristics and influence factors,large scale tests and finite element modal analysis are conducted. The results show that, dynamic characteristics of eccentrically braced semi-rigid steel frames are different from traditional frames. With the decrease of rotation stiffness of beam-column connections, structural natural vibration period gradually extends, and the damping ratio increases. The relevant provisions of the existing codes do not apply to such structural system. The simplified calculation method of natural period and the reference value of damping ratio for eccentrically braced semi-rigid steel frames are provided according to the research results.