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C.S. Horas, A.M.P. Jesus, R. Calcada, "Integrated Methodology for Fatigue Assessment of Existing Metallic Railway Bridges", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 6.5, 2022, doi:10.4203/ccc.1.6.5

Keywords: fatigue assessment, existing bridges, local methods, hierarchical models.

Abstract

Bridges are typically large structures whose numerical modelling is focused on the global scale, mainly due to computational constraints. Using such models, the evaluation of fatigue phenomena is not possible based on local mechanical quantities, with the difference between the dimension of the structure and the local nature of the damage being a multiscale problem. Presently, S-N relations for nominal stresses are assumed to overcome this issue, but the mechanism of loading transference may not be correctly represented and conservative approximations are in general adopted to analyse existing bridges. In order to reduce the assumed safety margins, hierarchical modelling strategies should be implemented to allow the fatigue assessment based on local methods using fatigue parameters evaluated according to the properties of the real structural response. At the local scale, the geometrical, material and contact characteristics may be modelled using submodelling relations potentiated by modal superposition principles to improve the computational efficiency. Thus, an integrated methodology is proposed, combining global and local methods, each with a specific range of application. Aiming at demonstrating the capabilities of the suggested multiphase calculation strategy, a real case study is investigated.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 1 PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 6.5 Integrated Methodology for Fatigue Assessment of Existing Metallic Railway Bridges C.S. Horas¹, A.M.P. Jesus² and R. Calcada¹ ¹CONSTRUCT-LESE, University of Porto, Faculty of Engineering, Portugal ²INEGI, University of Porto, Faculty of Engineering, Portugal doi:10.4203/ccc.1.6.5 Full Bibliographic Reference for this paper C.S. Horas, A.M.P. Jesus, R. Calcada, "Integrated Methodology for Fatigue Assessment of Existing Metallic Railway Bridges", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 6.5, 2022, doi:10.4203/ccc.1.6.5 Keywords: fatigue assessment, existing bridges, local methods, hierarchical models. Abstract Bridges are typically large structures whose numerical modelling is focused on the global scale, mainly due to computational constraints. Using such models, the evaluation of fatigue phenomena is not possible based on local mechanical quantities, with the difference between the dimension of the structure and the local nature of the damage being a multiscale problem. Presently, S-N relations for nominal stresses are assumed to overcome this issue, but the mechanism of loading transference may not be correctly represented and conservative approximations are in general adopted to analyse existing bridges. In order to reduce the assumed safety margins, hierarchical modelling strategies should be implemented to allow the fatigue assessment based on local methods using fatigue parameters evaluated according to the properties of the real structural response. At the local scale, the geometrical, material and contact characteristics may be modelled using submodelling relations potentiated by modal superposition principles to improve the computational efficiency. Thus, an integrated methodology is proposed, combining global and local methods, each with a specific range of application. Aiming at demonstrating the capabilities of the suggested multiphase calculation strategy, a real case study is investigated. download the full-text of this paper (PDF, 1776 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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