空间索面人行悬索桥人致振动分析研究  

Research on Human-Induced Vibration of Pedestrian Suspension Bridge with Spatial Cable Plane

作　　者：叶剑 刘雪松 秦波 YE Jian;LIU Xue-song;QIN Bo

机构地区：[1]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014

出　　处：《内蒙古公路与运输》2022年第3期1-4,共4页Highways & Transportation in Inner Mongolia

摘　　要：为研究柔性悬索桥整体刚度小、桥面受竖向集中荷载易产生S形变形以及受横风或人行激励等水平荷载作用下横向稳定性不足的解决方案,文章以渌水人行悬索桥为例,采用数值分析和经验公式相结合的方法,基于RM Bridge软件的建模和分析结果,并采用《Guidelines for the design of footbridges》推荐的引起“锁定效应”的行人数量临界值公式,对该桥的人致振动特性进行分析。通过研究行人步频与结构自振频率相互关系,计算临界行人数量,对桥梁的使用舒适性进行评价。研究结果表明:渌水桥设计采用的空间索面结构型式基本避开了行人步伐频率,临界人数及舒适度在可接受范围内,但与理论人群静荷载相比差距较大。通过采取两对斜拉式索附加稳定措施后,横向刚度得到进一步提高,具备较好抑振效果,大幅提高了人群动荷载的允许值。研究结果可为类似人行悬索桥的抑振设计提供参考。To study and solve the problems of small overall stiffness, S-shaped deformation of deck under vertical concentrated load and insufficient lateral stability under horizontal loads such as crosswind and pedestrian excitation for flexible suspension bridges, the pedestrian induced vibration characteristics of Lushui Pedestrian Suspension Bridge were analyzed by combining numerical analysis with empirical formula. Based on the modeling and analysis results of RM Bridge software, the pedestrian induced vibration characteristics of the bridge are analyzed by using the formula for the critical value of the number of pedestrians causing the "locking effect" recommended in "Guidelines for the design of footbridges".The results show that: the structure type and cable-stayed stability cable measures adopted in the design of Lushui bridge have good vibration suppression effect, avoiding the pedestrian step frequency,and the critical number of people and comfort are within the acceptable range. The analysis results can provide reference for the vibration suppression design of similar pedestrian suspension bridges.

关 键 词：柔性悬索桥 舒适度 人致振动 控制措施 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]