Analytical and simplified models for dynamic analysis of short skew bridges under moving loads

Nguyen, Gia Khanh and Velarde, Carlos and Goicolea, Jo´se M. (2019). Analytical and simplified models for dynamic analysis of short skew bridges under moving loads. "Advances in Structural Engineering", v. 22 (n. 9); pp. 2076-2088. ISSN 1369-4332. https://doi.org/10.1177/1369433219831481.

Description

Title: Analytical and simplified models for dynamic analysis of short skew bridges under moving loads
Author/s:
  • Nguyen, Gia Khanh
  • Velarde, Carlos
  • Goicolea, Jo´se M.
Item Type: Article
Título de Revista/Publicación: Advances in Structural Engineering
Date: February 2019
ISSN: 1369-4332
Volume: 22
Subjects:
Freetext Keywords: skew bridge; bridge modelling; modal analysis; moving load
Faculty: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Department: Aeronaves y Vehículos Espaciales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (1MB) | Preview

Abstract

Skew bridges induce inherently coupled bending and torsion response. The actual relevance of this coupling for the dynamic response under moving loads such as those arising in high-speed railways is not well known, introducing uncertainties unless costly three-dimensional dynamic models are used. In this work, models are developed based on beam theory and analytical extraction of vibration modes, which are both simple and fast. First, a general three-dimensional beam model is derived, involving both bending and torsional modes. In the following, a simplified beam model is proposed involving only bending modes. In both cases, the eigenfrequencies, eigenmodes and orthogonality relationships are determined analytically from the boundary conditions, and the dynamic response is obtained numerically in the time domain. Both models are validated through representative realistic examples by comparing with two types of finite element models: a stick model with three-dimensional beams and a full three-dimensional model with shell elements. Finally, parametric studies are performed with the simplified beam model for identifying parameters that influence the dynamic response under traffic loads. The results show that the degree of skewness has an important influence on the vertical displacement, but hardly on the vertical acceleration of the bridge. The torsional stiffness has a significant effect on the vertical displacement when the skew angle is large. Finally, the span length reduces the skewness effect on the dynamic behaviour of the bridge.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainBIA2015-71016-REDINPFUnspecifiedEvaluación dinámica de puentes de ferrocarril; seguridad e interoperabilidad de estructuras existentes o renovadas

More information

Item ID: 54619
DC Identifier: https://oa.upm.es/54619/
OAI Identifier: oai:oa.upm.es:54619
DOI: 10.1177/1369433219831481
Official URL: https://journals.sagepub.com/doi/abs/10.1177/1369433219831481?journalCode=asea
Deposited by: Memoria Investigacion
Deposited on: 28 Apr 2021 10:06
Last Modified: 11 May 2021 14:30
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM