铁路客站大跨度连廊人致振动响应分析与控制

Analysis and Control of Human⁃induced Vibration Response of Long Span Corridor in Railway Passenger Station

跨度52 m的钢结构大跨度连廊是西安火车站改造工程的重要组成部分。建立有限元模型,对大跨度连廊进行结构模态分析和人致振动响应分析。结果表明,连廊结构第一阶竖向自振频率落在人正常活动的步频范围内,在正常人行荷载激励下可能引发共振且振动响应不满足人致振动舒适度的设计要求,须放置调谐质量阻尼器(Tuned Mass Damper,TMD)对1.3 Hz和2.6 Hz步频的人致振动进行减振控制。在连廊跨中区域放置TMD后,有效降低了结构的竖向自振加速度,舒适度满足设计要求。

The 52 m long span steel structure corridor is an important part for the reconstruction project of Xi’an railway station.Through the establishment of finite element model,the structural modal analysis and human-induced vibration response analysis of long span corridor were carried out.The results show that the first order vertical natural frequency of corridor structure falls within the range of normal human activity step frequency,which may cause resonance under normal pedestrian load excitation,and the vibration response cannot meet the design requirements of human induced vibration comfort.Therefore,tuned mass damper(TMD)should be placed,and vibration control for the human induced vibration of 1.3 Hz and 2.6 Hz step frequency should be implemented.After TMD was placed in the mid span area of the corridor,the vertical natural acceleration response of the structure is effectively reduced,and the comfort can meet the design requirements.