混凝土框架-防屈曲支撑结构周期折减系数研究

Research on Period Shortening Factor of Concrete Frame With Buckling-Restrained Brace

由于规范没有对混凝土框架-防屈曲支撑结构的周期折减系数的取值给出建议,故考虑填充墙的非线性,通过有限元分析研究了48个工况条件下的混凝土框架-防屈曲支撑体系在不同设防目标下周期折减系数的变化规律和取值问题.结果表明:该结构体系的周期折减系数取值与抗震设防目标位移有关,在相同的目标位移下,结构体系对周期折减系数的影响不大.最后,对框架-防屈曲支撑结构体系的周期折减系数取值提出了建议.

Because there was no suggestion value of period shortening factor of concrete frames with buckling-restrained brace( BRB) in chinese code,the authors researched 48 different cases,with the consideration of infill wall's nonlinear performance to find the proper value of period shortening factor for different seismic design requirements. The conclusion is that the period shortening factor relates to the displacement requirement of seismic structure and the influence of structural system to the period reduction factor is not obvious. Finally,the authors gave the suggested values of period reduction factor for concrete frame with BRB.