中文核心期刊
CSCD来源期刊
中国科技核心期刊
RCCSE中国核心学术期刊

重庆交通大学学报(自然科学版) ›› 2018, Vol. 37 ›› Issue (04): 1-6.DOI: 10.3969/j.issn.1674-0696.2018.04.01

• 桥梁与隧道工程 •    下一篇

某异形景观桥人致振动荷载取值及舒适度分析

张雪松,陈永辉,王继祥   

  1. (重庆交通大学 土木工程学院,重庆 400074)
  • 收稿日期:2016-10-27 修回日期:2017-05-31 出版日期:2018-04-12 发布日期:2018-04-12
  • 作者简介:张雪松(1975—),男,重庆人,副教授,博士,主要从事大跨度桥梁设计方面的研究。E-mail:88464106@qq.com。 通信作者:陈永辉(1992—),男,安徽宿州人,硕士研究生,主要从事大跨度桥梁设计方面的研究。E-mail:348514018@qq.com。

Comfortability Analysis and Dynamic Load Value of the Human Induced Vibration of A Special-Shaped Landscape Bridge

ZHANG Xuesong,CHEN Yonghui,WANG Jixiang   

  1. (School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,P. R. China)
  • Received:2016-10-27 Revised:2017-05-31 Online:2018-04-12 Published:2018-04-12

摘要: 异形景观桥刚度较小,在人群动荷载作用下,会引起桥上行人舒适度较差问题。进行动力时程分析并评定其振动特性,关键是确定桥上人群动荷载。通过采用傅立叶三角级数表达脚步 力荷载,引入动载因子考虑人行荷载的高阶谐波分量,对全桥进行时程分析计算加速度响应:结构形式优化可有效提高刚度,基于振型模态、活载影响面(线)确定荷载加载点,外界激励等于 或接近结构竖向频率时,振动加速度最大,并以此评定舒适度等级。并以国内某拟建景观玻璃桥为例,展示了人行景观桥的动力设计过程。

关键词: 桥梁工程, 人群动荷载, 加速度, 动力时程分析, 舒适度, 动载因子

Abstract: The stiffness of the special-shaped landscape bridge is small.Under the action of the dynamic load of the crowd,the pedestrian comfort degree of the bridge will be poor.In order to perform dynamic time history analysis and evaluate its vibration characteristics,the key is to determine the dynamic load on the bridge.The Fourier triangle series was used to express the footstep force load; and the dynamic load factor was introduced to consider the high order harmonic component of the pedestrian load.The time history analysis of the whole bridge was performed to calculate the acceleration response.It is indicated that the structural form optimization can effectively improve the stiffness.The load loading point is determined on the basis of the vibration mode and the live load influence surface (line).When the external excitation is equal to or close to the vertical frequency of the structure,the vibration acceleration is maximum,which is used to evaluate the comfort level.Taking a proposed landscape glass bridge in China as an example,the dynamic design process of pedestrian landscape bridge was demonstrated.

Key words: bridge engineering, crowd dynamic load, acceleration, dynamic time history analysis, comfortability, dynamic load factor

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