大跨连续钢箱梁人行廊桥舒适度分析及振动控制  

Comfort analysis and vibration controlling on pedestrian lounge bridge of continuous steel box girder with large span

作　　者：蔡纪锋 胡隆健 CAI Jifeng;HU Longjian(Fuzhou Planning and Design Institute Group Co.,LTD.,Fuzhou 350108;College of Civil Engineering,Fuzhou University,Fuzhou 350108)

机构地区：[1]福州市规划设计研究院集团有限公司,福建福州350108 [2]福州大学土木工程学院,福建福州350108

出　　处：《福建建筑》2025年第1期126-131,共6页Fujian Architecture & Construction

摘　　要：钢结构人行桥自振频率较低,在人行荷载作用下会产生竖向和横向振动,严重时会影响桥梁的安全性和舒适性,因而有必要采取合理的减振措施。以莆田状元桥为工程背景,对该桥的自振特性和动力响应进行分析,探讨不同总质量比调谐质量阻尼器(MTMD)的减振效果。研究结果表明,状元桥在人行荷载作用下,行人步频越接近桥梁结构自身频率,动力加速度响应越强烈。一阶谐波人行荷载作用下,人行步频为1.8Hz、人行密度为1.0 P/m^(2)和1.5 P/m^(2),中跨跨中的加速度会超过规范的限制值0.5 m/s^(2),舒适度较差,需要对其进行减振设计。二阶谐波人行荷载作用下,全桥最大的峰值加速度均小于0.5 m/s^(2),舒适度较好。研究还表明,采用MTMD具有较好的减振效果,减振率最高达到79.5%。此外,MTMD减振效果随总质量比的增加而提高,但是MTMD总质量比也不应过大。The steel pedestrian bridges with low natural frequence will generate vertical and lateral vibration under pedestrian loads,which will seriously affect the safety and comfort of the bridge,and thus it is necessary to take reasonable vibration damping measures.In this paper,the self-vibration characteristics and dynamic response of the bridge are analyzed against the background of Putian Scholar's Bridge,and the vibration damping effect of different total mass ratios of tuned mass dampers(MTMD)is explored.The results show that the closer the pedestrian step frequency is to the bridge structure's own frequency,the stronger the dynamic acceleration response is under the pedestrian load of the Scholar's Bridge.Under the first-order harmonic pedestrian load,the pedestrian step frequency is 1.8Hz,the pedestrian density is 1.0P/m^(2)and 1.5P/m^(2),and the acceleration in the middle span exceeds the limit of 0.5m/s^(2),which is poor in comfort,and vibration damping design is required.Under the second-order harmonic pedestrian load,the maximum peak acceleration of the whole bridge is less than 0.5m/s^(2),and the comfort is better.MTMD has a better vibration damping effect,and the damping rate reaches up to 79.5%.The vibration damping effect of MTMD becomes better with the increase of the total mass ratio,but the total mass ratio of MTMD should not be too large.

关 键 词：人行廊桥 MTMD 振动控制 舒适度 动力分析 

分 类 号：TU997[建筑科学—市政工程]