巨型框架三维隔震结构风振响应分析

Analysis of Wind Vibration Response to Three-dimensional Seismic Isolation Mega-Frame Structure

以日本NEC办公大楼的结构方案为例,采用SAP2000建立巨型框架抗震结构和巨型框架三维隔震结构的分析模型,对结构施加脉动风荷载,分析子框架调谐比和隔震层阻尼比对巨型框架三维隔震结构减振效果的影响规律,进而完成参数优化,最后对两种结构的位移和加速度进行风振响应分析。研究结果表明:子框架调谐比和隔震层阻尼比分别设置为0.53和0.3时,可使巨型框架三维隔震结构减振效果达到最佳;在脉动风荷载作用下,三维隔震支座的设置能够同时对主、子框架的风振响应实现有效控制。

Taking the structural scheme of NFC office building in Japan as an example,the analysis models of the aseismic mega-frame structure and the three-dimensional(3D)seismic isolation mega-frame structure are established by SAP2000.Pulsating wind forces are imposed upon the structure to investigate the impact of sub-frame tuning ratio and isolation layer damping ratio on the vibration damping performance of the 3D seismic isolation mega-frame structure.Finally,the displacement and acceleration of the two structures are analyzed for wind vibration response.The results show that the tuning ratio of the sub-frame and the equivalent damping ratio of the isolation layer set to 0.53 and 0.3,respectively,can optimize the vibration damping effect of the 3D seismic isolation mega-frame structure.Moreover,under pulsating wind load,the implementation of the 3D seismic isolation bearings results in a substantial reduction of wind-induced vibration response in both the.main frame and sub-frame.