大跨度人行斜拉桥人致振动荷载模式研究
Load Mode for Human-induced Vibration of Long-span Pedestrian Cable-stayed Bridge
胡佳 1张广达 2赵文力 1潘霞 1翟杨 1梁桓玮2
作者信息
- 1. 成都天府绿道建设投资集团有限公司,四川 成都 610041
- 2. 西南交通大学土木工程学院,四川 成都 610031
- 折叠
摘要
随着城市综合交通的快速发展,人行天桥跨度大幅度增大,已建成多个大跨度人行天桥.然而,大跨度人行天桥自振频率较低,普遍存在舒适度设计难题.人行天桥的舒适度设计一般采用与振型一致的固定动力荷载,但固定动力荷载引起的桥梁加速度响应与移动人群引起的加速度响应存在明显区别,因此通过实际人群移动探寻移动荷载对人行天桥加速度响应的规律.依托某大跨度人行斜拉桥实际工程,建立该桥的动力分析模型,并基于实桥测试结果验证模型有效性.基于校核的数值模型,对比规范建议满载与移动满载异同,并且分析不同长度、步幅的人行荷载对人行斜拉桥振动响应的影响规律.结果表明,规范建议满载与移动满载的区别体现在非卓越频率人行荷载作用下主梁加速度峰值大小及分布;人群长度为主跨跨径的 0.3 倍时,梁上加速度峰值可达到满载的80%,是设计实桥试验的最佳人群长度,与欧洲规范建议人数相比,人工成本降低 65.8%.
Abstract
With the rapid development of urban comprehensive transportation,the span of pedestrian bridges greatly increases,and a number of long-span pedestrian bridges are built.However,the comfort level of the long-span pedestrian bridge is faced with the outstanding problem of not enough pedestrians.The dynamic analysis model of the bridge is established on the long-span pedestrian cable-stayed bridge,and the validity of the model is verified.Based on the verified numerical model,the differences between the recommended load and the moving load are compared.In addition,the influence law of pedestrian load with different lengths and stride lengths on pedestrian cable-stayed bridge is analyzed.The results show that the difference between the recommended load and the moving load is reflected in the magnitude and distribution of the peak acceleration under pedestrian load with non-superior frequency.When the length of the crowd is 0.3 times of the main span,80%of the full load acceleration can be achieved.The value will be the best crowd length of the real bridge test,compared with the number of people recommended by European norms,the labor cost is reduced by 65.8%.
关键词
桥梁工程/斜拉桥/人行天桥/振动荷载/试验/有限元分析Key words
bridges/cable stayed bridges/pedestrian bridges/vibration loads/testing/finite element analysis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据