某教学楼单跨框架结构的屈曲约束支撑加固抗震分析

某四层教学楼的钢筋混凝土框架为单跨框架结构,在不同方案比较后决定对其采用屈曲约束支撑加固。使用分析软件采用反应谱法、静力弹塑性和动力弹塑性法对加固前后的结构进行了抗震性能的计算分析。反应谱法分析可知采用支撑加固后的结构抗侧刚度增大,周期减小,层间位移减小;静力弹塑性法分析显示加固后结构中屈曲约束支撑先于梁柱构件失效,结构冗余度增加;动力弹塑性法分析显示加固后结构在罕遇地震作用下,支撑进入塑性工作状态,显示出良好的滞回性能,消耗了地震能量,结构基底剪力显著减小。

Seismic analysis of retrofitting a single-span reinforced concrete frame teaching building structure with buckling-restrained braces

The reinforced concrete frame of a four story teaching building is a single span frame structure. After comparisons of different retrofitting schemes,buckling-restrained braces( BRBs) are adopted. Different methods are used to analyze the seismic behavior of the structures before and after retrofitted by BRBs,including the response spectrum analysis,the static elastic-plastic analysis and the dynamic elastic-plastic analysis. The response spectrum analysis shows that the lateral stiffness of the structure strengthened with BRBs increases,the vibration period and the story drifts decrease. The static elastic-plastic analysis shows that the BRBs lose effectiveness before the beam column members and the structural redundancy increased. The dynamic elastic-plastic analysis shows that the BRBs in the structure enters the plastic working state under the rare earthquake,and the base shear of the structure also decreases significantly.