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Fundamental Modal Properties of Simply Supported Railway Bridges Considering Soil-Structure Interaction Effects
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. ELU Konsult AB.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0003-2104-382X
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0002-5447-2068
2019 (English)In: Soil Dynamics and Earthquake Engineering, ISSN 0267-7261, E-ISSN 1879-341X, Vol. 121, p. 212-218Article in journal (Refereed) Published
Abstract [en]

In this paper, a simplified discrete model for calculating the modal parameters of the fundamental vertical mode of a simple beam on viscoelastic supports is proposed. Exact closed-form expressions for the fundamental natural frequency and modal damping ratio of the aforementioned coupled system are derived, as a function of the beam geometry and the foundation impedances. Using this model, the effect of the dynamic stiffness and dissipation capacity of the foundation-soil system on the modal characteristics of the fundamental vertical mode of the railway beam bridges is investigated and discussed. The proposed closed-form expressions, in combination with the impedance functions of different foundation-soil systems, can clarify the main features of dynamic SSI analysis of the railway beam bridges and lead to review the recommended modal damping ratios in the code provisions and design manuals.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 121, p. 212-218
Keywords [en]
Resonance of railway bridges, Dynamic Soil-Structure Interaction, Discrete Model, Impedance Functions, Period Lengthening, Foundation Damping
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-250254DOI: 10.1016/j.soildyn.2019.03.022ISI: 000469897300016Scopus ID: 2-s2.0-85063321442OAI: oai:DiVA.org:kth-250254DiVA, id: diva2:1307390
Note

QC 20190610

Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-06-25Bibliographically approved

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Battini, Jean-MarcPacoste, CostinKaroumi, Raid

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