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Smart Structures and Systems Volume 28, Number 1, July 2021 , pages 13-28 DOI: https://doi.org/10.12989/sss.2021.28.1.013 |
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Critical coupling span number in high-speed railway simply supported beam bridge |
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Yuntai Zhang, Lizhong Jiang, Wangbao Zhou, Yulin Feng, Xiang Liu and Zhipeng Lai
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| Abstract | ||
| In long-distance railways, some particular spans of high-speed railway simply supported beam bridges (HSRSBs) are commonly selected as the target structure. The target structure is the part of interest for the study and intended to be analyzed. Due to longitudinal constraints of the track system, the target structure is tightly coupled with other spans within certain range, and is affected by the coupled spans under longitudinal earthquake condition. A massive amount of time-consuming computation is required to determine the coupling span number using current finite element models. In an effort to overcome this challenge, an equivalent method for the longitudinal constraints of the track system is proposed, which greatly reduces the complexity of finite element model while retaining calculation precision. The coupling span number was determined by seismic analyses of a large number of cases using equivalent finite element models. Moreover, the influence of pier height and bottom pier stiffness on coupling span number was studied. Based on the relationship between the equivalent boundary sensitivity critical point and coupling span number, a method to quickly obtain coupling span number of the target structure in arbitrary HSRSB was constructed. | ||
| Key Words | ||
| coupling effect; critical coupling span number; equivalent model; spring-mass system | ||
| Address | ||
| (1) Yuntai Zhang, Lizhong Jiang, Wangbao Zhou, Yulin Feng, Xiang Liu, Zhipeng Lai: School of Civil Engineering, Central South University, Changsha 410075, China; (2) Lizhong Jiang: National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China. | ||