地震作用下大跨度连续梁桥半主动变阻尼控制研究

The study of semi-active control with variable dampes of large-scale continuous bridge under earthquakes

利用半主动变阻尼控制装置开展连续梁桥结构在纵向地震波作用下的振动控制研究,通过建立桥梁结构-半主动变阻尼系统力学模型和运动微分方程,进行不同地震波激励下,连续梁桥关键部位在无控?半主动变阻尼控制和主动控制下的响应值分析计算,其中最优控制力采用LQR算法确定,半主动变阻尼控制采用限界Hrovat最优控制算法。计算结果表明:半主动变阻尼控制与主动控制的控制效果接近,两者均起到了良好的减震作用,而其中半主动变阻尼控制所需能量少?设施经济可靠,是一种良好的结构减震控制方法。

In this paper,by use of the semi-active control with variable dampers,the study on longitudinal vibration of continuous bridge under earthquakes is presented.According to the mechanical model for the bridge and the semi-active control with variable dampers system and the differential equation of motion,the critical positions dynamical response of the bridge without control,semi-active control and active control are all studied.The LQR algorithm is adopted to calculate the optimizing controlling force.The algorithm of limiting Hrovat optimal control is adopted for the semi-active control.The calculated results show that the effect of semi-active control with variable dampes is approached to that of the active control.The semi-active control needs less energy and its device is also economical and reliable.It is a good vibration reduction control method.