土层地基上建筑结构混合控制的减震效率

研究土 -结构相互作用对结构混合控制减震效能的影响。首先建立了土层地基上结构混合控制的运动方程 ,通过不同输入地震波、不同土层剪切波速、不同结构参数等条件下的数值分析 ,讨论了桩基础对结构混合控制减震效率的影响规律。数值结果表明 :对于土 -结构相互作用体系 ,采用混合控制的减震效率明显要强于单一的 TL D的减震效率 ;在土层较为坚硬的情况下 ,混合控制仍具有较高减震效能 ;随着土层变软 ,土 -结构相互作用减小结构地震反应的效应趋于明显 ,混合控制的减震效率明显降低 ,因此 ,对软土地基上的结构实施混合控制时 ,必须先要正确分析土 -结构体系的地震反应。

Efficiency of hybrid control for suppressing seismic responses of structures built on soil fondation

The effect of soil-structure interaction (SSI) on the efficiency of th e hybrid control method that is combined of TLD and VFD to suppress seismic resp onse of structures has been studied in this paper. At first, the dynamic equatio n of the controlled structures built on the group-pile foundation is establishe d . Furthermore, several case studies including different input seismic waves, she ar wave velocities of soil and structure types are carried out for discussing th e SSI effect on the efficiency of hybrid control method. The numerical results s how that the hybrid control method has more efficient than the TLD control metho d for suppressing the seismic response of the soil-structures interaction syste m . It can be conducted that the hybrid control method is still efficient to suppr ess the seismic responses of the SSI systems when the soil is stiff. However SSI effect on the seismic response of structures becomes strong and the efficiency of the hybrid control method decreases obviously when the soil turns to soft . Therefore, it is necessary to analyze accurately the seismic response of the s oil-structure systems before the hybrid control is applied to the structures bu ilt on the soft soil foundation.