附加MTMD的大跨度桥悬臂推送架设竖向减振

针对装配式钢桁桥悬臂推送架设过程中跨度逐渐增大、结构振动加剧,应用调谐质量阻尼器(Tuned mass damper,TMD)进行减振控制又受到结构布置受限等问题,运用多重调谐质量阻尼器(Multi-ple tuned mass dampers,MTMD)来进行架设过程的减振控制.应用ANSYS软件建立了某型装配式钢桁...

Vertical Vibration Attenuation During Erection of Long-Span Bridge Cantilever with Additional MTMD

In the process of cantilever erection of prefabricated steel truss bridge, the span gradually increases and the structural vibration intensifies, but the vibration control using tuned mass dampers (TMD) is limited by the structural layout. So, multiple tuned mass dampers (MTMD) are used to reduce vibration control in erection process. This paper established the finite element model of a prefabricated steel truss bridge by using ANSYS and carried out model analysis and harmonic response analysis to determine the controlled mode. Then the parameters of MTMD were designed and optimized by genetic algorithm, and the instantaneous dynamic analysis was carried out for the uncontrolled state and the controlled state. The calculation results show that the dynamic vibration response of the bridge is effectively suppressed by MTMD. The paper also studied the effects of different numbers of TMD on the vibration attenuation of the system, and obtained basic laws of vibration attenuation with the change of TMD numbers.