地铁引起装配式结构振动的组合碟形弹簧隔振研究

Study on the Effect of Combined Disc Spring Isolation on Assembled Structure Vibration in Subways

为了研究组合碟形弹簧对地铁引起装配式结构产生振动的隔振效果,建立地铁轨道-路基-土体-组合碟形弹簧-半刚性节点装配式结构的三维有限元计算模型,计算装配式结构建筑物隔振前后的自振周期和结构竖向加速度频谱,对比分析结构节点转动刚度、地铁车速、结构与轨道中心距离,探讨这些因素对组合碟形弹簧隔振效果的影响。结果表明:隔振后,结构的自振周期相比于隔振前增大2倍左右;组合碟形弹簧具有明显的隔振作用,隔振效率超过50%;相比于铰接节点和刚接节点装配式结构,组合碟形弹簧的隔振效果在半刚性节点装配式结构中更为明显;地铁列车以80 km/h~100 km/h运行时,组合碟形弹簧的隔振效果表现最好;组合碟形弹簧的隔振效果随对合数的增大而越明显,与对合数呈非线性关系;结构振动频率在0~10 Hz时,隔振效果更好。

The vibration isolation effect of the combined disc springs on the vibration of the assembled structures in subways is studied.A three-dimensional finite element model including subway track,roadbed,soil,composite disc springs and semi-rigid joint assembly structure is established.The self-oscillation period and vertical acceleration spectrum of the assembled structure before and after the vibration isolation installed were calculated.And the influences of rotational stiffness of the structural joints,the speed of the subway trains,the distance between the structure and the center of the track on the vibration isolation effect of the combined disc springs are compared and analyzed.The results show that the vibration period of the structure after installing the vibration isolation is about 2 times larger than that before installing the vibration isolation.The combined disc springs have an obvious vibration isolation effect and their isolation efficiency is more than 50%.Compared with the assembled structure with hinged joints and rigid joints,the vibration isolation effect of the combined disc spring is more obvious in the semi-rigid joint assembled structure.When the subway train runs at 80 km/h-100 km/h speeds,the vibration isolation effect of the combined disc spring is the best.The vibration isolation effect of the combined disc spring increases rapidly and non-linearly as the logarithmic number increases.The vibration isolation effect is much better when the structural vibration frequency is in the range of 0-10 Hz.