柱顶弹簧隔振结构抗震性能分析与研究

Seismic performance analysis and research of column top spring isolation structure

既有地铁下行纵穿北京大学某教学楼2段单体,2段主体结构采用钢筋混凝土框架结构,并在地下室柱顶设置钢弹簧+黏滞阻尼器进行隔振。采用ETABS及ABAQUS软件,分别对结构进行了不同设防地震作用下的弹性和弹塑性分析,从结构整体指标、隔振支座变形及阻尼器减震效果等方面,论证了结构的抗震性能。弹性分析及弹塑性分析结果表明,结构采用钢弹簧隔振支座同时附加阻尼器后,结构弹性性能及弹塑性性能均能满足要求;隔振层阻尼器减小了弹簧支座的水平变形,同时消耗了输入到主体结构的地震能量,避免弹簧支座变形过大的同时,减小了整体结构的地震剪力及变形。

The existing subway goes down through the two sections of a teaching building of Peking University. The main structure of the two sections adopted the reinforced concrete frame structure, and a steel spring + viscous damper was installed on the top of the basement columns for vibration isolation. Using ETABS and ABAQUS software, the elasticity and elastoplastic analysis of the structure under different earthquakes were carried out respectively, and the seismic performance of the structure was demonstrated from the aspects of the overall structure index, deformation of the vibration isolation support and damping effect of the damper. The results of elastic analysis and elastoplastic analysis results show that after the structure adopts steel spring vibration isolation support and additional damper, the structural elastic performance and elastoplastic performance can meet the requirements;the vibration isolation layer dampers reduce the horizontal deformation of the spring support and dissipate the seismic energy input to the main structure, and the spring support is prevented from being deformed too much, and the seismic shear force and deformation of the overall structure are reduced.