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J. Chordà-Monsonís¹, J.C. Sánchez-Quesada¹, E. Moliner¹, A. Romero², P. Galvín² and M.D. Martínez-Rodrigo¹

¹Department of Mechanical Engineering and Construction, Universitat Jaume I, Castelló de la Plana, Spain
²Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, Spain

J. Chordà-Monsonís, J.C. Sánchez-Quesada, E. Moliner, A. Romero, P. Galvín, M.D. Martínez-Rodrigo, "Study of the Soil-Structure Interaction on a Portal Frame Railway Bridge Through Experimental Validation", in P. Iványi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Eighteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 10, Paper 2.2, 2025,

Keywords: vibration, finite elements, experimental measurements, high speed, computational effort, ballasted track.

Abstract

Soil-structure interaction plays a major role in the dynamic response of partially-buried structures such as portal frame railway bridges. However, it is seldom included in numerical models, as it usually has associated a high computational cost. However, studies show that this intricate interaction mechanism is a cause of discrepancy between experimental and measured modal parameters, which could induce an erroneous assessment of the serviceability limit states of the structures and uneconomical bridge designs. For this reason, a study on an existing portal frame is conducted in this work. First, the modal parameters are identified from experimental data. Then, a 3D finite-element numerical model considering the track-bridge-soil system is implemented. Perfectly matched layers are used as absorbing boundaries. Dynamic stiffness functions are derived and used to implement a simplified version of the model on which the soil is substituted by a series of frequency-dependent spring-damper elements. The dynamic problem is solved by complex modal superposition to predict the bridge response under operating conditions. Track irregularities are taken into account. The results obtained are satisfactory, allowing to obtain the bridge response with reasonable accuracy and in an efficient manner.

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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: 10 PROCEEDINGS OF THE EIGHTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: P. Iványi, J. Kruis and B.H.V. Topping Paper 2.2 Study of the Soil-Structure Interaction on a Portal Frame Railway Bridge Through Experimental Validation J. Chordà-Monsonís¹, J.C. Sánchez-Quesada¹, E. Moliner¹, A. Romero², P. Galvín² and M.D. Martínez-Rodrigo¹ ¹Department of Mechanical Engineering and Construction, Universitat Jaume I, Castelló de la Plana, Spain ²Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, Spain Full Bibliographic Reference for this paper J. Chordà-Monsonís, J.C. Sánchez-Quesada, E. Moliner, A. Romero, P. Galvín, M.D. Martínez-Rodrigo, "Study of the Soil-Structure Interaction on a Portal Frame Railway Bridge Through Experimental Validation", in P. Iványi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Eighteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 10, Paper 2.2, 2025, Keywords: vibration, finite elements, experimental measurements, high speed, computational effort, ballasted track. Abstract Soil-structure interaction plays a major role in the dynamic response of partially-buried structures such as portal frame railway bridges. However, it is seldom included in numerical models, as it usually has associated a high computational cost. However, studies show that this intricate interaction mechanism is a cause of discrepancy between experimental and measured modal parameters, which could induce an erroneous assessment of the serviceability limit states of the structures and uneconomical bridge designs. For this reason, a study on an existing portal frame is conducted in this work. First, the modal parameters are identified from experimental data. Then, a 3D finite-element numerical model considering the track-bridge-soil system is implemented. Perfectly matched layers are used as absorbing boundaries. Dynamic stiffness functions are derived and used to implement a simplified version of the model on which the soil is substituted by a series of frequency-dependent spring-damper elements. The dynamic problem is solved by complex modal superposition to predict the bridge response under operating conditions. Track irregularities are taken into account. The results obtained are satisfactory, allowing to obtain the bridge response with reasonable accuracy and in an efficient manner. download the full-text of this paper (PDF, 26059 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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