黏滞阻尼器在框架结构抗震加固中的应用与研究

Application and Research of Viscous Damper in Seismic Reinforcement of Frame Structures

近年来利用阻尼器对既有建筑结构进行减震加固得到了广泛关注。建立了某实际4层框架结构的非线性模型,然后设置黏滞阻尼器(VFD),利用时程分析法对有、无控结构进行地震响应分析计算,得出该结构的耗能减震效果。最后利用云图法,选取数条地震波对结构进行分析计算,对有、无控结构进行概率地震分析,通过对比概率需求模型、易损性曲线的差异分析黏滞阻尼器的耗能减震作用。计算结果表明,通过对该结构设置若干VFD,结构的地震响应得到显著地减小,结构整体减震效果明显;有控结构的地震需求易损性曲线相较无控结构趋于平缓,表明VFD对该结构的耗能减震加固作用明显。

In recent years,the use of dampers for seismic reinforcement of existing building structures has attracted extensive attention.In this paper,the nonlinear model of an actual 4-story frame structure is established,and then the viscous damper(VFD)is set.The seismic response of the controlled and uncontrolled structure is analyzed and calculated by using the time history analysis method,and the energy dissipation and damping effect of the structure is obtained.The seismic vulnerability of the structure is analyzed by comparing the probability of seismic energy dissipation with and without damper.Finally,the seismic vulnerability of the structure is calculated by using the cloud control method.The calculation results show that the seismic response of the structure is significantly reduced and the overall damping effect of the structure is obvious by setting several VFDs.Compared with the uncontrolled structure,the seismic demand vulnerability curve of the controlled structure tends to be gentle,indicating that VFD has an obvious effect on the energy dissipation and damping reinforcement of the structure.