Influence of emergency vehicle on dynamic response of 92 m span composite truss bridge
SUN Zeyang1, LIU Yang1, YANG Junfeng2, WU Bitao3, ZHAO Qilin4
1. Key Laboratory of Concrete and Pre-stressed Concrete Structures of Ministry of Education, Southeast University, Nanjing, Jiangsu 211189, China; 2. Guangzhou Metro Design and Research Institute Co., Ltd., Guangzhou, Guangdong 510010, China; 3. State Key Laboratory of Rail Transit Infrastructure Performance Monitoring and Support, East China Jiaotong University, Nanchang, Jiangxi 330013, China; 4. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 211816, China
Abstract：To investigate the dynamic performance of long-span truss fiber reinforced polymer(FRP) bridge after repairing completion, the 92-meter-span FRP truss bridge model was established based on guide girder pushing. The vehicle-bridge coupling algorithm of long-span composite truss bridge was compiled to analyze the effects of speed, vehicle weight and road surface roughness on the mid-span vertical displacement, vertical acceleration and key member stress of the FRP truss bridge. The results show that the more uneven the road surface is, the greater the impact of the vehicle on the bridge structure is. The vertical displacement is more affected by the road surface level than that by the member stress. In the speed range from 20 km/h to 50 km/h, the impact coefficient is less affected by the speed change. When the vehicle speed exceeds 50 km/h, the influence of speed change on the impact coefficient is gradually increased. The peak curve of vehicle mass to bridge dynamic response shows linear increasing trend. When the vehicle mass is 2.80×104 kg with vehicle speed of 30 km/h, the maximum mid-span vertical displacement is 167 mm, which does not exceed the military emergency bridge displacement limit (L/120), indicating that the bridge design can meet the emergency traffic requirements.
ZHANG H J, PAN D R, ZHAO D, et al.On the structural formation of the main structure of a long-span highway emergency bridge and its erection technology [J]. Traffic Engineering and Technology for National Defence, 2019,17(5):1-5.(in Chinese)
LI C,WU M J. Construction technology of long-span prefabricated highway steel bridge by cantilever push-out method [J].Hunan Transportation Science and Technology, 2013,39(3):127-131.(in Chinese)
FENG P,TIAN Y,QIN Z P. Static and dynamic behavior of a truss bridge made of FRP pultruded profiles [J]. Industrial Construction, 2013,43(6):36-41.(in Chinese)
ZHANG D D,YUAN J X,ZHAO Q L,et al. A novel FRP-metal space truss structure and its flexural perfor-mance [J]. Industrial Construction, 2019,49(9):102-108,166.(in Chinese)
ZHAO Q L, LIU P F,XU L X,et al. Research on mechanical properties of a glass fiber reinforced polymer-steel combined truss structure [J]. Industrial Construction, 2013,43(Sup):210-214.(in Chinese)
XU L Q, LIANG M D, JIANG Z， et al. Performance analysis of K-type joints of multi-axial BFRP square tube truss [J]. Journal of Nanjing Tech University (Natural Science Edition), 2023,45(1):71-78.(in Chinese)
ZHAO Q L, GAO Y F, LI F. Current research and development of the application of the pre-tightened tooth connection [J]. Fiber Reinforced Plastics/Composites, 2014(12):52-56.(in Chinese)
［9］
GOU H Y, SHI X Y, ZHOU W, et al. Dynamic performance of continuous railway bridges: numerical analyses and field tests [J]. Journal of Rail and Rapid Transit, 2018,232(3):936-955.
［10］
CAI C B, HE Q L, ZHU S Y, et al. Dynamic interaction of suspension-type monorail vehicle and bridge: numerical simulation and experiment [J]. Mechanical Systems and Signal Processing, 2019,118:388-407.
［11］
GUO W H, XU Y L. Fully computerized approach to study cable-stayed bridge-vehicle interaction [J]. Journal of Sound and Vibration, 2001,248(4):745-761.
［12］
HAG-ELSAFI O,ALBERS W F,ALAMPALLI S. Dynamic analysis of the bentley creek bridge with FRP deck [J]. Journal of Bridge Engineering, 2012,17(2):318-333.
CHEN Y H, LI S Z, ZHANG G Y, et al. A theoretical study of the dynamic performance of the main girder of an FRP light bridge [J].Traffic Engineering and Technology for National Defence, 2014,12(2):7-11,24.(in Chinese)
ZHOU R J, WANG Y, CHEN H.Analysis of vehicle-bridge coupled vibration of long-span curved truss bridge in service [J]. Journal of Vibration Engineering, 2022,35(1):103-112.(in Chinese)
SHEN H M, XIAO X B. Numerical method for vehicle-bridge coupled vibrations [J]. Journal of Southwest Jiaotong University, 2003,38(6):658-662.(in Chinese)
2024, Vol. 45 
