近断层地震动作用下黏滞阻尼器的减震研究

Research on damping of viscous damper under near-fault ground motion

为研究近断层地震动对减震建筑的抗震性能和结构设计带来的影响,本文通过介绍黏滞阻尼器的研究现状和减震分析,简单阐述近断层地震动的定义以及其运动特性,并以4条近断层速度脉冲型地震动输入到ETABS建立的减震模型和非减震模型中进行时程分析,从顶层位移时程曲线、顶层加速度时程曲线、底层剪力时程曲线以及减震结构中黏滞阻尼器的滞回曲线等角度分析黏滞阻尼器的减震效果。研究结果表明:1)减震结构的地震反应小于非减震结构,黏滞阻尼器可以减小近断层速度脉冲型地震动;2)设置黏滞阻尼器可以提高建筑结构的抗震性能。本文研究结果可为今后的建筑结构减震设计提供一定的参考。

In order to study the influence of near-fault ground motion on seismic performance and structural design of shock-absorbing buildings,the definition and motion characteristics of near-fault ground motion are briefly described by introducing the research status and shock-absorbing analysis of viscous dampers;4 near-fault velocity pulsed ground motions are input to the damping model and non-damping model established by ETABS for time history analysis;and the damping effect of viscous damper is analyzed from such perspectives as top displacement time history curve,top acceleration time history curve,bottom shear time history curve and hysteresis curve of viscous damper in shock absorption structure.The results show that:1)the seismic response of the damping structure is smaller than that of the non-damping structure,and the viscous damper can reduce the near-fault velocity pulse ground motion;2)setting viscous dampers can improve the seismic performance of building structures.The research results can provide certain references for the damping design for future building structures.