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Study on the effectiveness of longitudinal barrier-type unseating prevention restrainer for girder bridges during earthquakes
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Haoyuan GAO1, Shengbin WANG2, Jinghui XIANG3, Jianzhong LI1, Xin QI4
Journal of Vibration Engineering | 2025, 38(2) : 321 - 330
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Journal of Vibration Engineering | 2025, 38(2): 321-330
Study on the effectiveness of longitudinal barrier-type unseating prevention restrainer for girder bridges during earthquakes
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Haoyuan GAO1, Shengbin WANG2, Jinghui XIANG3, Jianzhong LI1, Xin QI4
Affiliations
  • 1.State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
  • 2.Anhui Transportation Holding Group Co., Ltd., Hefei 230088, China
  • 3.Tianjin Municipal Engineering Design and Research Institute Co., Ltd., Tianjin 300392, China
  • 4.Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China
Published: 2025-02-10 doi: 10.16385/j.cnki.issn.1004-4523.2025.02.011
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In order to prevent unseating during earthquakes, both domestic and foreign seismic codes for bridges require the use of unseating prevention devices. However, research on the effectiveness of these devices is limited. This article focuses on a bridge using a longitudinal barrier-type unseating prevention beam device, examining the limitations and effectiveness of such devices in preventing unseating. First, the working principle of the longitudinal barrier-type unseating prevention device is introduced. On this basis, a five-span simply supported beam bridge is studied, considering the nonlinear mechanical behavior of concrete blocks as a typical longitudinal barrier-type unseating prevention device. The study analyzes and compares the effects of block device strength, clearance, and the installation of rubber pads on the limiting and unseating prevention capabilities of the device. Research has shown that the effectiveness of the devices is closely related to its strength , initial clearance, and the intensity of seismic motion.Proper device strength and initial clearance can help reduce collision forces and frequencies, lower the risk of beam unseating, and control bridge pier damage within an ideal range. Furthermore, placing buffer rubber pads at the contact surfaces between the unseating prevention device and the substructure can effectively reduce pounding forces and minimize pier damage.

bridge engineering  /  longitudinal barrier-type  /  girder unseating prevention  /  pounding
Haoyuan GAO, Shengbin WANG, Jinghui XIANG, Jianzhong LI, Xin QI. Study on the effectiveness of longitudinal barrier-type unseating prevention restrainer for girder bridges during earthquakes[J]. Journal of Vibration Engineering, 2025 , 38 (2) : 321 -330 . DOI: 10.16385/j.cnki.issn.1004-4523.2025.02.011
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Article Info
doi: 10.16385/j.cnki.issn.1004-4523.2025.02.011
  • Receive Date：2023-02-22
  • Online Date：2026-02-11
  • Published：2025-02-10
Article Data
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History
  • Received：2023-02-22
  • Revised：2023-04-28
Funding
Affiliations
    1.State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
    2.Anhui Transportation Holding Group Co., Ltd., Hefei 230088, China
    3.Tianjin Municipal Engineering Design and Research Institute Co., Ltd., Tianjin 300392, China
    4.Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
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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