防屈曲耗能支撑加固钢筋混凝土框架抗震效果分析

以一幢抗震性能未满足抗震规范的4层钢筋混凝土框架结构为算例,对其采用增设防屈曲耗能支撑的方法进行抗震加固,并对原有结构及加固后结构进行了小震、中震下反应谱及地震波时程的抗震效果对比分析。分析结果表明,防屈曲耗能支撑能够有效地提高结构的抗震性能。在小震作用下,防屈曲耗能支撑处于弹性状态,为结构提供抗侧刚度;在中震作用下,防屈曲耗能支撑逐渐进入非线性状态,作为结构第一道防线消耗地震能量。

ANALYSIS OF THE SEISMIC EFFECTS FOR THE SEISMIC RETROFIT OF A CONCRETE FRAME WITH BUCKLING-RESTRAINED BRACES

This paper presents the seismic retrofit of a 4-story reinforced concrete frame with buckling-restrained braces (BRB), including comparison the seismic effects between the original structure and the retrofitted structure using response spectra analysis and history analysis under the frequent earthquakes and the basic earthquakes. The results indicate that: the BRBs can improve aseismatic capacity of the structure; when subjected to the frequent earthquakes, the BRBs are in elastic state,providing the stiffness for the main structure; when subjected to the basic earthquakes,the BRBs in the structure are in non-lined state, providing the energy-dissipation capacity.