双向耦合地震作用下的混合控制结构研究

Structural Hybrid Vibration Control with MRD and Sliding Base-isolation under Coupling Effect of Bi-directional Earthquake

目的为了改善滑移隔震结构的减震效果和适用范围,研究双向耦合地震作用对控振结构的影响.方法提出3种磁流变阻尼器(MRD)与滑移隔震混合方案,建立了双向耦合地震作用下MRD与滑移隔震混合控制结构的动力分析模型,推导出其运动微分方程,采用瞬时最优控制算法对6层MRD与滑移隔震混合控制结构进行地震反应分析.结果MRD与滑移隔震混合结构的3种混合方案在3种工况荷载作用下的相对加速度峰值、相对速度峰值、相对位移峰值和层间剪力峰值分别比3种工况下的滑移隔震结构有不同程度的降低.结论当考虑竖向地震作用存在时,随着竖向地震作用的加大,结构的地震反应有小幅度地增加,但各种结构方案都具有良好地减振效果。各混合方案在各种工况下的各种地震反应均得到了更好地控制,而混合方案3的控制效果更加明显.

In order to improve the effect of shock absorption and applied scope of sliding base-isolated structure and study the influence of the action of coupling earthquake in both horizontal and vertical direction to vibration control structure, three kinds of hybrid projects with magnetorhrological damper （MRD） and sliding base-isolation were proposed in the paper. The theory of hybrid structure with MRD and sliding base- isolation under the action of coupling earthquake in both horizontal and vertical direction was researched. A kinematic differential equation was developed. Seismic response analysis of 6-story hybrid structure with MRD and sliding base-isolation was processed according to the theory of instantaneous optimal control （IOC） algorithm. Compared with sliding base-isolated structure, the peak value of various seismic responses of three hybrid projects with MRD and sliding base-isolation were reduced. Comparison of the results of dynamic analysis shows that various seismic responses of hybrid structure with MRD and sliding base-isolation under various loading conditions get better control than sliding isolated structure; the control effect of the third hybrid project is the best.