设置粘滞阻尼器的框架结构弹塑性时程分析

ON THE ELASTOPLASTIC TIME-HISTORY ANALYSIS OF FRAME STRUCTURES WITH VISCOUS DAMPERS

粘滞阻尼器是一种速度相关型结构消能装置,对结构只提供附加阻尼,而不提供附加刚度。文中以实际工程为例,应用结构分析软件PKPM与SSG进行粘滞阻尼器框架结构的弹塑性时程分析,研究8度小震与大震下的抗震性能。研究表明小震时程作用下,粘滞阻尼器能为结构提供附加阻尼比不小于2%。大震时程作用下,层间位移角均小于规范限值1/50;此外,随着时程加速度峰值的提高,粘滞阻尼器耗散输入地震能量的能力进一步加大,有效保护了主体结构。研究成果可为实际工程应用提供理论参考和实际指导。

Viscous dampers are a kind of velocity-dependent structural energy dissipation device,which only pro⁃vides additional damping,but not additional stiffness to the structure.Taking a practical engineering project as the research objective,the elastic-plastic time history analysis of viscous dampers frame structures is carried out by us⁃ing the structural analysis software PKPM and SSG to study its seismic performance under 8 degree small and large earthquakes.The results show that viscous dampers provide an additional damping ratio of no less than 2%for the structure under the action of small earthquake time history.Under the action of large earthquake time history,the in⁃terstudy displacement angle is less than the standard limit value 1/50.In addition,with the increase of the peak val⁃ue of time history acceleration,the ability of viscous dampers to dissipate input seismic energy is further increased,which effectively protects the main structure.The paper may provide theoretical guidance for practical engineering application.