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Steel and Composite Structures Volume 44, Number 4, August25 2022 , pages 473-488 DOI: https://doi.org/10.12989/scs.2022.44.4.473 |
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Analytical evaluation of the influence of vertical bridge deformation on HSR longitudinal continuous track geometry |
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Zhipeng Lai, Lizhong Jiang, Xiang Liu, Yuntai Zhang and Tuo Zhou
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| Abstract | ||
| A high-speed railway (HSR) bridge may undergo long-term deformation due to the degradation of material stiffness, or foundation settlement during its service cycle. In this study, an analytical model is set up to evaluate the influence of this longterm vertical bridge deformation on the track geometry. By analyzing the structural characteristics of the HSR track-bridge system, the energy variational principle is applied to build the energy functionals for major components of the track-bridge system. By further taking into account the interlayer's force balancing requirements, the mapping relationship between the deformation of the track and the one of the bridge is established. In order to consider the different behaviors of the interlayers in compression and tension, an iterative method is introduced to update the mapping relationship. As for the validation of the proposed mapping model, a finite element model is created to compare the numerical results with the analytical results, which show a good agreement. Thereafter, the effects of the interlayer's different properties of tension and compression on the mapping deformations are further evaluated and discussed. | ||
| Key Words | ||
| energy variational principle; high-speed railway; longitudinal continuous track; track geometry; track/bridge interaction | ||
| Address | ||
| Zhipeng Lai:1)School of Civil Engineering, Central South University, Changsha 410075, China 2)National Engineering Center for High-speed Railway Construction, Changsha 410075, China Lizhong Jiang:1)School of Civil Engineering, Central South University, Changsha 410075, China 2)National Engineering Center for High-speed Railway Construction, Changsha 410075, China Xiang Liu:School of Civil Engineering, Central South University, Changsha 410075, China Yuntai Zhang:School of Civil Engineering, Central South University, Changsha 410075, China Tuo Zhou:School of Civil Engineering, Central South University, Changsha 410075, China | ||