郭  兵^1,2  郭彦林²  李光明¹
（1 山东建筑工程学院土木系  济南 250014； 2 清华大学土木系  北京 100084）

[提要]  通过对单自由度体系和多自由度体系半刚接钢框架的动力特征分析，初步探讨了梁柱连接转动刚度对结构自振周期、频率、临界阻尼以及振型等参数的影响。半刚接钢框架的周期、频率介于刚接和铰接框架之间，且随着连接转动刚度的变化而变化，当节点转动刚度位于(10²～10⁵)kN.m/rad 时对结构动力性能的影响最显著,[B结构的振动形式保持不变。
[关键词]  半刚接钢框架 周期 频率 振型

Abstract:  Based on the analysis for the dynamic characteristics of semi-rigjd steel frames with simple or multiple degree-of- freedoms, effects of rotation stiffness of beam-to-column connections on the structure period, frequency, critical damping and mode of vibration are discussed. The period and frequency of semi-rigid frames are between rigid and simple frames, and they are changjng with the rotation stiffness of connections. It has remarkable effect on the dynamic characters when the rotation stiffness is between l0²～l0⁵ kN.m/rad, but the shape of vibration keeps unchanged.
Keywords: semi-rigid steel frame; period; frequency; mode of vibration