某人行天桥跳跃荷载下振动分析与测试
Vibration Analysis and Field Test of a Footbridge under Human Jumping Load
DOI: 10.12677/HJCE.2018.73035, PDF,    国家自然科学基金支持
作者: 崔常慧*：东南大学土木工程学院，江苏 南京；张志强：东南大学土木工程学院，江苏 南京；东南大学混凝土及预应力混凝土结构教育部重点实验室，江苏 南京
关键词: 人行桥；动力特性；动力响应测试；振动舒适度；调谐质量阻尼器；Footbridge； Dynamic Properties； Dynamic Response Test； Vibration Serviceability； TMD
摘要: 采用有限元分析与现场测试相结合的方法，研究南京某人行天桥在人跳跃荷载下的振动问题，并选取调谐质量阻尼器(TMD)进行振动控制和舒适度设计。利用ANSYS软件建立结构三维模型，进行模态分析及不同跳跃工况下减振前后桥面动力响应时程分析；对实际结构进行环境激励下的动力特性测试，对比分析减振前后单人、多人跳跃情况下实测加速度响应。研究表明，原结构竖向基频小于3 Hz，在跳跃荷载下不满足规范的加速度要求；设置TMD后，加速度明显减小，TMD可有效控制该桥的人致竖向振动。
Abstract: By combining the methods of field test and finite element analysis, vibration under human jumping load of a footbridge in Nanjing was studied, and tuned mass dampers (TMD) were used to control vibration and carry out comfort design. A three-dimensional finite element model of the structure was developed by ANSYS software for modal analysis and dynamic time-history analyses with different human jumping loads before and after the installation of TMD. Ambient vibration tests were conducted to get the dynamic properties of the structure, and the actual acceleration responses of the structure under single person and multiple people jumping with and without TMD were compared. The research indicates that the first vertical frequency of the original structure is less than 3 Hz, and the vertical maximum acceleration exceeds the threshold value of the code; after the installation of TMD, the acceleration is reduced obviously, and TMD can effectively control human induced vertical vibration of the bridge.
文章引用：崔常慧, 张志强. 某人行天桥跳跃荷载下振动分析与测试[J]. 土木工程, 2018, 7(3): 303-312. https://doi.org/10.12677/HJCE.2018.73035

参考文献

[1] 吕西林, 丁鲲, 施卫星, 等. 上海世博文化中心TMD减轻人致振动分析与实测研究[J]. 振动与冲击, 2012, 31(2): 32-37 + 150.
[2] Dallard, P., Fitzpatrick, A.J., Flint, A., et al. (2001) The London Millennium Footbridge. Structural Engineer, 79, 17-33.
[3] 陈政清, 华旭刚. 人行桥的振动与动力设计[M]. 北京: 人民交通出版社, 2009: 9-13, 74-106.
[4] 李爱群, 陈鑫, 张志强. 大跨楼盖结构减振设计与分析[J]. 建筑结构学报, 2010, 31(6): 160-170.
[5] CJJ69-1995. 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.
[6] EN 1995-2. (2004) Eurocode 5: Design of Timber Structures-Part 2: Bridges. European Committee for Standardization, Brussels.
[7] BS 5400. (1978) Steel, Concrete and Composite Bridge. British Standards Association, London.
[8] CAN/CSA S6-06. (2011) Canadian Highway Bridge Design Code. Canadian Standards Association, Ottawa.
[9] RFS2-CT-2007-00033. (2008) Human Induced Vibrations of Steel Structures (HIVOSS): Design of Footbridges. Research Fund for Coal and Steel, Brussels.
[10] 张志强, 胡心一, 张相勇, 等. 青岛北站西广厅减振设计[J]. 建筑结构, 2013(23): 17-22.
[11] Murray, T.M., Allen, D.E. and Ungar, E.E. (2003) Steel Design Guide 11: Floor Vibrations Due to Human Activity. American Institute of Steel Construction (AISC).
[12] 施卫星, 马秋玲. 结构振型脉动测试方法的应用[J]. 振动与冲击, 2006, 25(S): 886-888.

为你推荐