时滞对桥梁半主动控制和主动控制的影响

桥梁减震半主动控制和主动控制系统中会存在一系列时滞因素,为了探讨时滞对桥梁控制效果的影响规律,建立桥梁的有限元模型和减震控制方程,并考虑控制系统不同的滞后时间,采用粘滞阻尼器对一座大跨连续梁桥进行了减震控制地震反应数值计算。结果表明,时间滞后对半主动控制和主动控制的影响趋势基本相同,均会使控制系统的减震效果随着滞后时间的增大而越来越差,甚至会增大桥梁地震反应和使地震反应发散,但是半主动控制出现减震效果为零的滞后时间和地震反应发散的滞后时间均比主动控制更加长一点,这显示了半主动控制的优越性。

INFLUENCE OF TIME-DELAY ON SEMI-ACTIVE CONTROL AND ACTIVE CONTROL FOR BRIDGE

There are some time-delay factors in the systems of semi-active control and active control for bridge.In order to explore the influence laws of time-delay on bridge control effectiveness,the bridge finite element model and the seismic mitigation control equation are setup.With different lag time of control system,the vibration control seismic response calculation and analysis for a long-span continuous beam bridge are performed with viscous dampers.The results indicate that the influence trends of time-delay on semi-active control and active control are almost the same.Time-delay can make the vibration-suppressed effectiveness of the two control systems worse with lag time longer.It can augment the seismic responses of bridge and can make the seismic responses instable.The lag time with which vibration-suppressed effectiveness is zero and the lag time with which seismic response is instable of semiactive control are all longer than those of active control.This shows the advantage of semi-active control.