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Mathematical Problems in Engineering
Volume 2016, Article ID 2749720, 17 pages
http://dx.doi.org/10.1155/2016/2749720
Research Article

Dynamic Behavior of Tied-Arch Bridges under the Action of Moving Loads

Department of Civil Engineering, University of Calabria, Via Pietro Bucci, Cubo 39-B, Rende, 87030 Cosenza, Italy

Received 27 January 2016; Accepted 7 April 2016

Academic Editor: Xiao-Qiao He

Copyright © 2016 Paolo Lonetti et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The dynamic behavior of tied-arch bridges under the action of moving load is investigated. The main aim of the paper is to quantify, numerically, dynamic amplification factors of typical kinematic and stress design variables by means of a parametric study developed in terms of the structural characteristics of the bridge and moving loads. The basic formulation is developed by using a finite element approach, in which refined schematization is adopted to analyze the interaction between the bridge structure and moving loads. Moreover, in order to evaluate, numerically, the influence of coupling effects between bridge deformations and moving loads, the analysis focuses attention on usually neglected nonstandard terms in the inertial forces concerning both centripetal acceleration and Coriolis acceleration. Sensitivity analyses are proposed in terms of dynamic impact factors, in which the effects produced by the external mass of the moving system on the dynamic bridge behavior are evaluated.