消能减震技术在某血液透析中心韧性加固中的应用

Application of Seismic Energy Dissipation Technology in Resilient Reinforcement for a Hemodialysis Center

结合某单跨混凝土框架结构,详细介绍消能减震技术在医疗建筑加固项目中的应用。通过在房屋四周2个主轴方向设置屈曲约束支撑(BRB)进行整体抗震加固,小震作用下,屈曲约束支撑仅提供刚度,减小弹性层间位移角,消能减震子结构吸收部分地震作用,大大减少其他主体结构加固量。中震作用下,屈曲约束支撑略屈服,并承担部分水平地震作用,增强柱抵抗水平地震作用的能力。大震作用下,屈曲约束支撑充分耗能,减少主体结构塑性损伤,提高整体抗震性能。屈曲约束支撑通过自身耗能,保护主体结构,实质上为结构损伤控制设计的方法。通过震后仅更换损伤严重的屈曲约束支撑,可达到韧性结构要求。采用屈曲约束支撑对单跨框架结构医疗建筑进行整体抗震加固具有较好效果。

Combined with a single-span concrete frame structure,this paper introduces in detail seismic retrofit of a medical building applying energy dissipation technology.The seismic retrofit is carried out by arranging several buckling-restrained braces(BRBs)in 2 orthogonal directions.Under the frequent earthquake action,the BRBs only provide stiffness to reduce the elastic story drifts,and the substructures absorb partial seismic energy,reducing the amount of the main structure’s retrofit greatly.Under the basis earthquake action,the BRBs yield slightly and bear partial horizontal seismic action,which enhance the ability of the column to resist horizontal seismic action.Under the rare earthquake action,the BRBs yield in compression as well as tension with significant energy dissipation,and reduce the plastic damages of the main structure,improving the overall seismic performance.The BRBs protect the main structure through hysteretic energy,which is essentially a kind of structural damage control design procedures.By replacing the seriously damaged BRBs after the earthquake,it can fulfill the target of seismic resilience.The use of BRBs for seismic strengthening of medical buildings with single span frame structure has a good effect.