轻型墩桥梁结构被动控制研究

Passive Control of Light-Pier Bridge Structure

针对地震作用下轻型墩墩顶位移控制设计问题,提出采用多重调谐质量阻尼器(MTMD)对其位移进行控制,以降低对轻型墩的延性要求.首先将被控结构简化为单自由度体系,建立结构-MTMD系统力学模型和运动方程,分析MTMD各设计参数对动力放大系数的影响规律.在此基础上,针对某一轻型墩桥梁设计MTMD,进行不同地震波作用下的减震时程分析,并与调谐质量阻尼器(TMD)的振动控制效果进行比较.

Multiple tuned mass damper （MTMD） is proposed to be adopted in the design to control the light pier top displacement under seismic load so that light pier needs not to be very ductile. With the structure taken as a single-degree of freedom structure system, the calculating model of structure- MTMD system is built and the motion differential equation is derived. The effect of MTMD parameters on dynamic magnification factors is analyzed. Based on the conclusion, MTMD is designed and time- history analyses under two seismic waves are made. Finally, a comparison is made between the vibration controlling effect of MTMD and that of TMD.