大型渡槽结构半主动变阻尼控制研究

Study on Semi-active Variable Damping Control for Large Aqueduct Structures

在渡槽减震研究方面,结构主动变阻尼控制对于纵向地震输入下渡槽结构主动变阻尼控制的研究几乎为空白。根据结构振动控制的基本原理,建立了大型渡槽的动力分析模型及运动方程,采用限界Hrovat最优控制算法来调节变阻尼控制装置实现相应的控制力;并以南水北调某大型渡槽为例,对比计算了大型渡槽在无控、半主动控制和主动控制三种情况下的地震响应差异。结果表明:在跨间伸缩缝处安装主动变阻尼控制装置,中跨左右节点和跨中最大位移分别降低了31%、27%和30%,对槽身和墩顶的位移控制效果较好。主动变阻尼装置能提供与结构运动方向相反即阻止结构运动的控制力,能有效降低渡槽结构纵向地震响应,限界Hrovat最优控制算法能很好跟踪和实现目标主动最优控制力。

Based on the basic principle of the vibration control for structures, the branch-and- bound Hrovat optimal control algorithm is employed in the study of the semi-active variable damping control for large aqueduct structures. The dynamic model and motion equations of the large aqueduct are set up, and the active variable damping algorithm of semi-active control is introduced here. The differences of longitudinal seismic response under no control, semi-active control and active control are compared and calculated. It is concluded from the study results that the active variable damping control device can effectively control the response of longitudinal virations. The Hrovat optimal control algorithm can track and achieve the avtive control for the target effectively.