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Steel and Composite Structures Volume 27, Number 2, April25 2018 , pages 161-175 DOI: https://doi.org/10.12989/scs.2018.27.2.161 |
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In-situ test and dynamic response of a double-deck tied-arch bridge |
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Hongye Gou, Wen Zhou, Genda Chen, Yi Bao and Qianhui Pu
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| Abstract | ||
| In this study, in-situ dynamic tests of the world\'s longest steel box tied-arch bridge over the Yangtze River, China, are reported. The double deck bridge supports highway and monorail systems at upper and lower levels, respectively. Strain, displacement, and acceleration responses were measured and used to investigate the vibration characteristics of the bridge when excited by running trains and/or trucks at a speed of 5-60 km/h, train braking, and truck bouncing. Impact factors were correlated with the running speed of trains and trucks. A three-dimensional finite element model of the coupled monorail-train-bridge vibration system accounting for track irregularities was established to understand the system behavior and validated by the experimental results. Truck bouncing was the dominant impact factor on bridge responses. The running speed of vehicles determined the riding comfort of traveling trains. | ||
| Key Words | ||
| straddle-type monorail; double-deck tied-arch bridge; in-situ dynamic test; finite element analysis; vibration; impact; riding comfort | ||
| Address | ||
| (1) Hongye Gou, Wen Zhou, Qianhui Pu: Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; (2) Hongye Gou: Key Laboratory of High-Speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China; (3) Hongye Gou, Genda Chen, Yi Bao: Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65401, USA. | ||