组合减震加固技术在教学楼加固中的应用

Application of Composite Damping Retrofitting Technology of School Building

分别采用传统加固方案、屈曲约束支撑(buckling restrained braces,BRB)加固方案、黏滞阻尼器(viscous fluid dampers,VFD)加固方案和BRB+VFD组合减震加固方案对某教学楼进行多遇地震作用下弹性时程分析和罕遇地震作用下弹塑性时程分析,对比分析层间位移角、层间剪力、附加阻尼比等。研究结果表明,多遇地震作用下,BRB+VFD组合减震加固方案中BRB可提供刚度,解决了底部薄弱层的问题,VFD可提供附加阻尼,减小了地震作用,进而减小了构件加固量。罕遇地震作用下,BRB+VFD组合减震加固方案下结构层间位移角更均匀,整体充分耗能且损伤较小,达到损伤控制和韧性结构要求。综合考虑,BRB+VFD组合减震加固方案为最优方案。

By using traditional retrofitting plan,BRB retrofitting plan,VFD retrofitting plan and BRB+VFD composite damping retrofitting plan for a school building,linear time⁃history analysis under frequent earthquakes and non⁃linear time history analysis under rare earthquakes were operated.The inter⁃story drift angle,floor shear force,additional damping ratio were compared and analyzed.The research results show that under frequent earthquakes,BRB provides stiffness in the BRB+VFD composite damping retrofitting plan,solving the problem of first weak story,while VFD provides additional damping to reduce earthquake action,thereby reducing the amount of structure component reinforcement.Under rare earthquakes,the BRB+VFD composite damping retrofitting plan has a more uniform inter⁃story drift angle,fully dissipatting energy overall,and causes less overall damage,meeting the requirements of damage control and resilient structure.Taking all factors into consideration,the BRB+VFD composite damping retrofitting plan is the optimal solution.