基于ATMD的大长宽比超高层建筑平动-扭转耦联风振控制研究

RESEARCH ON LATERAL-TORSIONAL COUPLED WIND VIBRATION CONTROL OF SUPER HIGH-RISE BUILDINGS WITH LARGE LENGTH-WIDTH RATIO UPON ATMD

  • 摘要: 强风作用下,大长宽比超高层建筑易发生复杂的平动-扭转耦联振动响应,难以满足风振舒适度的要求。针对该类风振控制问题,该文基于主动调谐质量阻尼器和线性二次型调节器,提出了一种平动-扭转加权最优控制算法,建立了被控系统的4自由度的降阶动力学模型,给出了相关参数计算公式及算法的具体实现步骤。以通用有限元软件ABAQUS为平台,开发了相应的UAMP子程序,并利用一个长宽比为6.6的实际工程案例对所开发算法进行了测试。测试结果表明,所提出的平动-扭转加权最优控制算法对于大长宽比超高层建筑的平动-扭转耦联的振动响应具有良好的减振效果,可以对平扭双模态起到控制作用,其中加速度减振率最高可达46%以上。

     

    Abstract: Under strong wind loading, super high-rise buildings are prone to complex lateral-torsional coupled wind vibrations, which will cause the floor acceleration to excess the requirements that ensure inhabitant comfort. To solve this problem, this study proposes a lateral-torsional weighted optimal control (LTWOC) algorithm, based on an active tuned mass damper (ATMD) and a linear quadratic regulator (LQR). One four-degrees-of-freedom reduced order dynamic model is built in the LTWOC and the calculation formulas for the related parameters as well as the algorithm steps are provided. Based on the LTWOC, a user subroutine UAMP is developed on ABAQUS and tested by a real engineering case with a length-width ratio of 6.6. The research results indicate that the LTWOC proposed can effectively reduce the lateral and torsional response of the structure with large length-width ratio under wind-induced vibrations. The maximum acceleration reduction rate in the example is as high as 46%.

     

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