建筑结构的主动隔震控制

建筑结构的主动控制和被动控制可以有效地减少地震荷载时结构的动力反应。被动隔震控制已被广泛应用于实际的结构控制。为了进一步降低结构震动,主动控制无疑是一种比较理想的方法,它对于提高结构抵抗外界激励不确定性的能力,直接减少输入的干扰,以及在震动发生时连续自动的调整结构动力特性方面均优于被动控制。通过试验对建筑结构主动隔震控制进行研究,试验在伊利诺伊大学香槟分校的智能实验室进行。试验模型是3层2跨的剪切型结构,设置在底层的3个伺服千斤顶提供不超过2%建筑自重的控制力,控制结构的面内运动(X方向,Y方向和XY平面内的转动)。试验结果表明该控制技术不仅可以有效的控制基础隔震层的位移,而且可以控制基底剪力在5%结构自重以内。

Active Base Isolation of Building Structure

The control of civil structures through passive and active control techniques can potentially provide adequate seismic protection.Passive base-isolation techniques have proven effective in the past in the control of structural vibrations.To further reduce the structural vibration,active control may be considered.This paper presents on an experimental study of a three-story,two-bay model shear building that has been constructed for testing in the Smart Structures Technology Laboratory at the University of Illinois at Urbana Champaign.The flexible structure will be placed on a base isolation layer and three actuators will be mounted to the lowest level.The three actuators will control in-plane motion（X-axis,Y-axis,and rotation in the XY-plane） and provides forces that do not exceed 2% of the building weight.The control strategy can reduce the building accelerations in addition to reducing the base shear to 5% of the building weight while maintaining reasonable base displacements.