屈曲约束支撑混凝土框架结构地震反应折减系数研究

Response modification factor for buckling-restrained braced RC frames

提出了一种运用静力推覆和FEMA440等效线性法求解结构体系地震反应折减系数的直接方法,运用此方法分析了按同一剪重比设计的3层、6层、9层的屈曲约束支撑混凝土框架地震反应折减系数,并用时程分析对结果加以验证。结果表明:运用此方法求解R值能够避免了繁琐的试算过程,具有足够的精度和保证率,屈曲约束支撑混凝土框架R值相比普通混凝土框架有明显提高。

This paper presented a direct method to calculate the response modification factor using pushover analysis and FEMA440 equivalent linearization method. The buckling-restrained braced RC frames of 3,6,9 stories were designed and analyzed. The results show a high accuracy and conservative rate of this method without tedious trials and a larger R factor of BRB-RC frames than ordinary concrete frame.