[1]张彦玲,张建林,李运生.柔性人行悬索桥在不同人流量下人致振动分析[J].西安建筑科技大学学报(自然科学版),2020,52(06):779-787.[doi:10.15986/j.1006-7930.2020.06.002 ]
　ZHANG Yanling,ZHANG Jianlin,LI Yunsheng.Analysis of human-induced vibration for flexible suspension footbridge under different pedestrian flow[J].J. Xi'an Univ. of Arch. & Tech.(Natural Science Edition),2020,52(06):779-787.[doi:10.15986/j.1006-7930.2020.06.002 ]
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柔性人行悬索桥在不同人流量下人致振动分析()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
52
期数:
2020年06期
页码:
779-787
栏目:
出版日期:
2020-12-20

文章信息/Info

Title:
Analysis of human-induced vibration for flexible suspension footbridge under different pedestrian flow
文章编号:
1006-7930(2020)06-0779-09
作者:
张彦玲1; 张建林1; 2; 李运生1
(1.石家庄铁道大学 土木工程学院,河北 石家庄 050043; 2.中铁上海设计院集团有限公司,上海 200070)
Author(s):
ZHANG Yanling1;  ZHANG Jianlin1; 2;  LI Yunsheng1
(1.School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 2.China Railway Shanghai Design Institute Group Co.,Ltd., Shanghai 200070, China)
关键词:
柔性人行悬索桥;  人流量;  自振特性;  人致振动;  行人舒适度
Keywords:
flexible suspension footbridge;  pedestrian flow;  natural vibration characteristics;  human-induced vibration;  pedestrian comfort
分类号:
U441.3; U448.11
DOI:
10.15986/j.1006-7930.2020.06.002
文献标志码:
A
摘要:
为了研究运营过程中不同人流量对于柔性人行悬索桥自振特性及人致振动响应的影响,以某地锚式(70+360+60)m柔性人行悬索桥为工程实例,采用Midas/Civil软件建立了有限元模型,计算了不同人流量下该人行悬索桥的自振频率.参考德国人行桥规范EN03-2007,计算了同步人群谐波荷载下主梁的竖向及侧向加速度,并进行了行人舒适度评价.计算结果表明:柔性人行悬索桥自振基频较低,行人步频所对应的均为较高阶的振动模态; 考虑人群质量后,主梁的各阶自振频率和行人谐波荷载下的加速度均较未考虑时减小,且随着人流量的增加,主梁的最大竖向及侧向加速度极值均随之增大.人群质量对主梁竖向和侧向加速度的影响不同,其结果与行人竖向和侧向谐波荷载不同的折减系数规律相关; 考虑人群质量后,该悬索桥在人流量为0.5人/m2时,行人处于很舒适状态,在1.0～2.0人/m2处于中等舒适状态.
Abstract:
In order to study the influence of different pedestrian flow on the natural vibration characteristics, vertical and lateral acceleration of suspension footbridges during operation, the finite element model of a(70+360+60)m ground-anchored suspension footbridge was established using Midas/Civil software, and the natural vibration frequencies were calculated. Based on the German pedestrian bridge standard EN03-2007, the vertical and lateral acceleration of the main girder under the synchronous crowd harmonic load were obtained, and the pedestrian comfort was evaluated. Results indicate that the natural vibration frequencies of the flexible suspension footbridge are rather low due to the flexibility of the bridge, which makes the pedestrian step frequency close to high-order vibration modes. Pedestrian mass makes the natural frequencies and the acceleration of the main girder decrease, and the maximum vertical and lateral acceleration improve with the increasing of the pedestrian mass. The pedestrian mass has different influence on the vertical and lateral acceleration of the main girder, which is related with the different reduction factor of the vertical and lateral pedestrian harmonic load. Considering the pedestrian mass, the suspension footbridge in this paper is in very comfort state under the pedestrian flow of 0.5 P/m2, and in medium comfort state under the pedestrian flow of 1.0～2.0 P/m2.

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备注/Memo

备注/Memo:
收稿日期:2020-06-20 修改稿日期:2020-11-16
基金项目:国家自然科学基金青年项目(51908382); 河北省自然科学基金青年项目(E2019210311)
第一作者:张彦玲(1973-),女,博士,教授,主要从事组合结构桥梁方面的研究.E-mail:06mzhang@163.com

更新日期/Last Update: 2020-12-20