粘弹性阻尼器对空间桁架结构减震设计与分析

Design and Analysis of Seismic Vibration Control for Long Span Space Trusses with Viscoelastic Dampers

大跨空间结构的振动控制问题一直是人们关注的焦点,其抗震性能的好坏直接关系到人民生命和国家经济财产安全。采用粘弹性阻尼器对大跨空间桁架结构进行减震控制,计算阻尼器相应的力学参数,并对加与未加粘弹性阻尼器结构的地震响应进行对比。分析计算表明:无论在Taft地震波还是在El Centro地震波下,在大跨空间桁架结构中加入粘弹性阻尼器均能有效减小结构的位移、加速度和内力,所加设的粘弹性阻尼器能显著吸收地震输入能量,从而更好地保证结构安全。

Seismic control of long span space trusses has been the focus of attention for the civil engineers. The anti-earthquake performance of the structures has a direct effect on the people＇ s life and economic safety. This paper utilizes the viscoelastic dampers to control the seismic vibration of long span space trusses. The mechanical parameters of the viscoelatic dampers are calculated and vibration responses of a certain truss with and without viscoelastic dampers are compared to assess the anti-earthquake performance of the structure with viscoelastic dampers. According to the calculation results, the seismic responses which include acceleration, displacement and inner force are obviously decreased under both Taft and E1 Centro earthquake wave. The vicoelastic dampers in the truss dissipate much of the input earthquake energy.