Abstract:The long-span pedestrian suspension bridge has the characteristics of light weight and low damping, and its natural vibration frequency is often very low, which is within the sensitive range of pedestrian step frequency. Therefore, human-induced vibration becomes a problem that cannot be ignored in the design of this type bridges, especially for suspension bridges in scenic spot. Based on the nonlinear finite element software, the typical vertical and lateral bending modes of the long-span glass suspension bridge in the Kanggu parkland were selected by using the direct resonance theory.Through the finite element time-history analysis method, the vertical and lateral acceleration response time-history curves of bridge deck under different crowd loads were calculated and obtained. The results show that the natural vibration frequency of the proposed bridge is small and the multi-order natural vibration frequencies are in the sensitive range of human step frequency.It is easy to cause obvious vibration of the bridge under the crowd step frequency excitation, which affects the comfort of the bridge. Therefore, the corresponding vibration reduction measures should be proposed.
[1] DALLARD P, FITZPATRICK T, FLINT A, et al. The Millennium bridge, London: Problems and solutions[J]. Structural Engineer, 2001, 79(8): 15-17.
[2] 阳治群.大跨异型玻璃悬索人行桥侧向振动临界人数估计[J].公路工程,2017,42(3):269-273.
YANG Zhiqun.Estimation of critical pedestrian number for a long span irregular pedestrian suspension glass bridge[J].Highway Engineering, 2017, 42(3): 269-273.
[3] 可路,王达磊,陈艾荣.景区大跨径人行索桥人致振动响应研究[J].公路交通科技,2013,30(11):101-105.
KE Lu, WANG Dalei, CHEN Airong. Research on human-induced vibration of long-span cable-supported footbridge in scenic spot[J].Journal of Highway and
Transportation Research and Development, 2013, 30(11): 101-105.
[4] 钱骥,孙利民.大跨径人行桥人致振动舒适性评估及减振措施[J].上海交通大学学报,2011,45(5):677-681.
QIAN Ji, SUN Limin. Comfort evaluation and vibration reduction design of long span footbridges[J]. Journal of Shanghai Jiaotong University, 2011, 45(5): 677-681.
[5] 朱俊朋,鞠三,徐秀丽,等.考虑舒适度的人行悬索桥振动控制[J].南京工业大学学报(自然科学版),2013,35(3):56-60.
ZHU Junpeng, JU San, XU Xiuli,et al. Vibration control of pedestrian suspension bridge considering human comfort[J].Journal of Nangjing University of Technology
(Natural Science Edition), 2013, 35(3):56-60.
[6] 陈政清.人行桥的振动与动力设计[M].北京:人民交通出版社,2009.
CHEN Zhengqing. Vibration and Dynamic Design of Footbridge[M]. Beijing: China Communications Press,2009.
[7] 张雪松,陈永辉,王继祥.某异形景观桥人致振动荷载取值及舒适度分析[J].重庆交通大学学报(自然科学版),2018,37(4):1-6.
ZHANG Xuesong, CHEN Yonghui, WANG Jixiang.Comfortability analysis and dynamic load value of the human induced vibration of aspecial-shaped landscape bridge[J].
Journal of Chongqing Jiaotong University(Natural Science), 2018, 37(4): 1-6.
[8] 河北省住房和城乡建设厅.景区人行玻璃悬索桥与玻璃栈道技术标准:DB13(J)/T264—2018[S].北京:中国建材工业出版社,2018.
Department of Housing & Urban-Rural Development in Hebei.Technical Standards for Pedestrian Glass Suspension Bridges and Glass Trestle in Scenic Spots: DB13
(J)/T264—2018[S]. Beijing: China Building Materials Industry Press, 2018.
[9] HICKS S J, FELDMANN M, HEINEMEYER, C, et al. Human-Induced Vibration of Steel Structures(HIVOSS)[M].Brussels: European Commission, 2006.
[10] 赵文忠,康健,梁栋.索梁结构面内耦合振动机理研究[J].重庆交通大学学报(自然科学版),2019,38(8):20-26.
ZHAO Wenzhong,KANG Jian,LIANG Dong.Study on the in-plane coupling vibration mechanism of cable-beam structures[J].Journal of Chongqing Jiaotong University
(Natural Science),2019,38(8):20-26.
[11] 北京市市政工程研究院.城市人行天桥与人行地道技术规范: CJJ89—95[S].北京:中国建筑工业出版社,1996.
Beijing Municipal Engineering Research Institute.Technical Specifications of Urban Pedestrian Overcrossing and Underpass: CJJ89—95[S]. Beijing: China Building
Industry Press, 1996.
[12] 孙利民,闫兴非.人行桥人行激励振动及设计方法[J].同济大学学报(自然科学版),2004,32(8):996-999.
SUN Limin, YAN Xingfei. Human walking induced footbridge vibration and its serviceability design[J]. Journal of Tongji University(Natural Science), 2004, 32(8):
996-999.
[13] 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(增刊2):148-159.
CHEN Zhengqing, LIU Guangdong. Pedestrian-induced vibration theory and dynamic design of footbridges[J].Engineering Mechanics, 2009, 26(Sup2): 148-159.
[14] BACHMANN H, PRETLOVE A J, RAINER H. Dynamic Forces from Rhythmical Human Body Motions in: Vibration Problems in Structures: Practical Guidelines[M].
Birkhauser, Basel, 1995.
[15] FELDMANN M, HEINEMEYER C, LUKIC M, et al. Human-Induced Vibration of Steel Structures: Design of Footbridges Guideline, RFS2-CT-2007-00033[R]. Luxembourg:
European Commission, 2008.
[16] 阳治群.大跨异型玻璃悬索人行桥侧向振动临界人数估计[J].公路工程,2017,42(3):269-273.
YANG Zhiqun.Estimation ofcritical pedestrian number for a long span irregular pedestrian suspension glass bridge[J].Highway Engineering, 2017, 42(3): 269-273.
[17] 施颖,张振宇,姚君,等.某异形拱人行桥通行舒适度及其控制研究[J].浙江工业大学学报,2017,45(5):495-500.
SHI Ying, ZHANG Zhengyu, YAO Jun, et al. Research on comfort and traffic control of a shaped arch footbridge[J]. Journal of Zhejiang University of Technology,
2017, 45(5): 495-500.
[18] 袁旭斌.人行桥人致振动特性研究[D].上海:同济大学,2006.
YUAN Xubin. Research on Human-Induced Vibration Characteristics of Pedestrian Bridge[D].Shanghai: Tongji University, 2006.
[19] RAINER J H. Vibrations in structures induced by man and machines[J]. Canadian Journal of Civil Engineering, 1988, 15(6): 1086-1087.
[20] Human Induced Vibrations of Steel Structures. Design of Footbridges Guideline: RFS2-CT-2007-00033[S]. Germany:Research Found for Coal & Steel, 2008.
[21] DEN-HARTOG J P. Mechanical Vibrations[M]. U.S.A.: McGraw Hill, 1956.