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Pedestrian-Induced Lateral Sway Analysis of Flexible Suspension Footbridges under Geometric Nonlinearity
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Junbao Yang1, Liang Xu1, 2, †, Houjun Kang3, Yi Hui4, Jianbing Chen1
Journal of Dynamics and Control | 2025, 23(10) : 18 - 25
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Journal of Dynamics and Control | 2025, 23(10): 18-25
• Research Articles •
Pedestrian-Induced Lateral Sway Analysis of Flexible Suspension Footbridges under Geometric Nonlinearity
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Junbao Yang1, Liang Xu1, 2, †, Houjun Kang3, Yi Hui4, Jianbing Chen1
Affiliations
  • 1.School of Civil Engineering, Suzhou University of Science and Technology, Suzhou　250009, China
  • 2.State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing　402247, China
  • 3.School of Civil Engineering and Architecture, Guangxi University, Nanning　530004, China
  • 4.School of Civil Engineering, Chongqing University, Chongqing　400044, China
doi: 10.6052/1672-6553-2025-042
Outline
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To investigate the influence of geometric nonlinearity on human-induced vibrations of flexible suspension bridges. A nonlinear finite-element model of a flexible pedestrian suspension bridge is established based on an engineering background, and validated using measured data. On this basis, nonlinear transient vibration analysis of the suspension bridge, considering geometric nonlinearity, is conducted. The analysis reveals that the structural displacement response time histories and time-frequency characteristics under different main cable sag-to-span ratios and excitation amplitudes, as well as the response-excitation amplitude curves. The results further show that single-frequency excitation at low-order vertical modes can induce high-order frequency vibrations at 1：2 and 1：3 ratios. When the ratio of vertical to horizontal natural frequencies is close to 2：1, a certain level of vertical excitation on the main girder can cause lateral sway of the structure. Increasing the main cable sag-to-span ratio can effectively suppress vertical and lateral coupling vibrations. As the vertical excitation level increases, the sway amplitude exhibits a sudden jump and significant increase at a critical excitation level. Under pedestrian-induced excitation, the flexible suspension bridge exhibits significant geometric nonlinear vibration characteristics.

flexible suspension bridge  /  pedestrian-induced vibration  /  nonlinear dynamics  /  swaying instability
Junbao Yang, Liang Xu, Houjun Kang, Yi Hui, Jianbing Chen. Pedestrian-Induced Lateral Sway Analysis of Flexible Suspension Footbridges under Geometric Nonlinearity[J]. Journal of Dynamics and Control, 2025 , 23 (10) : 18 -25 . DOI: 10.6052/1672-6553-2025-042
Funding
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  • State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University(SKLBT-2319)
  • Natural Science Foundation of the Jiangsu Higher Education Institutions of China(24KJB410005)
  • National Natural Science Foundation of China(52078087)
Appendix
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Year 2025 volume 23 Issue 10
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122
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Article Info
doi: 10.6052/1672-6553-2025-042
  • Receive Date：2025-02-25
  • Online Date：2026-03-20
Article Data
Affiliations
History
  • Received：2025-02-25
  • Revised：2025-04-23
Funding
State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University(SKLBT-2319)
Natural Science Foundation of the Jiangsu Higher Education Institutions of China(24KJB410005)
National Natural Science Foundation of China(52078087)
Affiliations
    1.School of Civil Engineering, Suzhou University of Science and Technology, Suzhou　250009, China
    2.State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing　402247, China
    3.School of Civil Engineering and Architecture, Guangxi University, Nanning　530004, China
    4.School of Civil Engineering, Chongqing University, Chongqing　400044, China
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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