基于能量准则的SDOF阻尼减震结构最大地震位移

Maximum seismic displacement of SDOF system with viscous damper based on the equal cyclic energy criteria

粘滞阻尼耗能能减小结构地震反应。根据振动等能量准则 ,由地震动力能量方程推导了单自由度 (SDOF)弹性体系的地震最大位移反应与阻尼比的关系。与地震动力时程数值分析方法计算得到的结果对比表明 :该文理论结果较好地反映了 SDOF结构的最大地震位移反应。在地震动特征周期处产生类共振时阻尼减震效果更为显著。利用振动等能量准则方法可较为简便地确定阻尼减震结构体系的最大位移反应和进行减震设计。

The seismic response of structure can be effectively decreased by energy dissipation by a viscous damper. This paper studies the relation between the maximum displacement response and the damping ratio based on the energy equation of single degree of freedom (SDOF) elastic systems. A simplified relation for the maximum displacement response and the damping ratio was developed to satisty the equal cyclic energy criteria. The results are comparable to numerical results from history dynamic analysis. The seismic response reduction of the resonance at dominant period of the earthquake ground motion is more effective. Therefore, this paper provides a method for the design of viscous damper energy dissipation seismic structures.