屈曲约束支撑钢筋混凝土框架结构的消能减震分析

Energy Dissipation on Buckling Restrained Braces in Reinforced Concrete Frame Structure

针对纯钢筋混凝土框架结构在地震高烈度区使用受限的情况,提出在框架中加入BRB形成一种具有耗能减震作用的结构.并选取一个9层钢筋混凝土框架结构,采用反应谱和时程分析两种方法对该框架结构在设置屈曲约束支撑前后的抗震性能进行了对比计算分析.结果表明,在框架结构中合理设置屈曲约束支撑,可以达到小震下增加框架结构的侧向刚度,明显降低结构侧向变形,大震下支撑屈服耗能,保证结构的安全可以取得良好的减、隔震效果.

For the case of the pure steel reinforced concrete frame structure is limited in high intensity seismic zone,it is proposed that BRB could be added in the frame to form a structure having the character of energy dissipation.According to a nine-storey reinforced concrete frame structure,the methods of response spectrum and time history analysis are adopted to calculate and analyze the seismic performance of this frame structure before and after setting the buckling restrained brace.The results show that：by reasonable set of buckling restrained braces in reinforced concrete frame,the lateral stiffness of frame structure is increased under small earthquakes and the structure＇s lateral deformation is reduced,while under major earthquake,the BRB is taking the lead in yielding state,which providing the safety of the structure.