[1]彭伟.大跨径人行钢悬索桥动力特性研究[J].防灾科技学院学报,2018,20(02):21-26.
 Peng Wei.Research on the Dynamic Characteristics of Large Span SteelSuspension Footbridge[J].JOURNAL OF INSTITUTE OF DISASTER PREVENTION,2018,20(02):21-26.
点击复制

大跨径人行钢悬索桥动力特性研究
分享到:

《防灾科技学院学报》[ISSN:1673-8047/CN:13-1377/P]

卷:
第20卷
期数:
2018年02期
页码:
21-26
栏目:
目次
出版日期:
2018-06-30

文章信息/Info

Title:
Research on the Dynamic Characteristics of Large Span Steel Suspension Footbridge
作者:
彭伟12
1.重庆安济建设加固工程有限责任公司,重庆401120; 2.招商局重庆交通科研设计院有限公司桥梁工程 结构动力学国家重点实验室,重庆400067
Author(s):
Peng Wei12
1.Chongqing Anji Construction & Reinforcement Co., Ltd., Chongqing 401120, China; 2.State Key Laboratory of Bridge Engineering Structure Dynamics, Chongqing Communication Research & Design Institute Co., Ltd.,China Merchants Group, Chongqing 400067, China
关键词:
钢结构 人行悬索桥 动力特性 环境激励 减振
Keywords:
steel structure suspension footbridge dynamic characteristics ambient excitation vibration reduction
分类号:
U448.25;TU311.3
文献标志码:
A
摘要:
随着跨径增大,人行钢悬索桥的宽跨比与高跨比明显减小,结构整体刚度较低,行人过桥时的结构振动问题较突出。以国内某在役人行钢悬索桥为研究对象,通过数值计算与实桥动力测试研究了结构自振频率、振型与阻尼比等动力特性参数,参考国内外有关规范资料评价了结构自振频率。结果表明,该桥低频范围的横向、竖向振动模态较密集,按脉动法实测频率与计算频率的比值为148~293,由于结构竖向与横向自振基频均小于1Hz,对行人激励较敏感,建议根据桥梁现状对上部结构进行适当改造以提高结构刚度或进行减振设计以改善结构动力性能。
Abstract:
For steel suspension footbridge, the widthspan ratio and depthspan ratio are obviously decreased and structural integral stiffness is thus reduced with the growth of span, which leads to the prominent problem of structural vibration when pedestrians cross bridge. Taking a domestic suspension footbridge in service as the subject, we research ed the dynamic characteristic parameters including natural vibration frequencies, modes of vibration and damping ratios by numerical calculation and field dynamic test, and assessed structural natural vibration frequencies according to the relevant specifications at home and abroad. As the results show, close vibration modes with low frequencies in vertical and transverse directions appear in the study bridge, and the ratio of natural vibration frequencies between measurement by pulsating method and calculation is 148~293. Due to structural fundamental frequencies of vibration is less than 1 Hz in vertical and transverse directions, steel suspension footbridges are sensitive to pedestrian motivation. So it is suggested that relevant improvement measures are necessary based on bridge actuality, including increasing structural stiffness by appropriately modifying the superstructure or improving bridge dynamic performance by vibration reduction design.

参考文献/References:

[1]林长川.现代悬索桥技术的若干进步[J].公路,1996(8):17-23.
[2]王晓倩,曾诗琪,冯彩霞.悬索桥计算理论发展及其分析[J].工程与建设,2017,31(5):596-599.
[3]徐恭义.在悬索桥中再度研究设计应用板式加劲梁[D]. 成都:西南交通大学桥梁工程系,2001.
[4]朱军颖.人行悬索桥加劲梁选型相关研究[D]. 成都:西南交通大学桥梁工程系,2012.
[5]Eleonora Lai,Carmelo Gentile,Maria Gabriella Mulas. Experimental and numerical serviceability assessment of a steel suspension footbridge[J]. Journal of Constructional Steel Research, 2017,132:16-28.
[6]S.Zivanovic, A.Pavic, P.Reynolds. Vibration serviceability of footbridges under humaninduced excitation a literature review[J] Journal of Sound and Vibration,2005,279:1-74.
[7]周颖,吕西林.建筑结构振动台模型试验方法与技术[M]. 北京:科学出版社,2012.
[8]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[9]向绿林,沈晴晴,谢岚,等.新旧桥梁承载能力评定对比研究[J].防灾科技学院学报,2016,18(4):30-36.
[10]中华人民共和国住房与城乡建设部. CJJ 166-2011城市桥梁抗震设计规范[S].北京:中国建筑工业出版社,2011.
[11]法永生,李东.某钢结构人行天桥动力特性测试与有限元分析[J].建筑结构,2007,37(3):63-68.
[12]温天宇,唐堂.某钢桁架人行桥自振特性测试及振动控制研究[J].现代交通技术,2015,12(6):21-24.
[13]中华人民共和国住房与城乡建设部. CJJ 69-95城市人行天桥与人行地道技术规范[S]. 北京:中国建筑工业出版社,1996.
[14]陈政清,刘光栋.人行桥的人致振动理论与动力设计[J].工程力学,2009,26(S2):148-159.
[15]白桦,李德锋,李宇,等.人行悬索桥抗风性能改善措施研究[J].公路,2012(12):1-6.
[16]李晓玮,何斌,施卫星.TMD减振系统在人行桥结构中的应用[J].土木工程学报,2013(46):245-250.

备注/Memo

备注/Memo:
收稿日期:2018-03-01 基金项目:重庆市教委科学技术研究项目(KJ1401323) 作者简介:彭伟(1980—),男,博士,高级工程师,主要从事工程安全与维护技术研究。
更新日期/Last Update: 2018-06-30