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.
Highlights
The tied-arch bridge represents a valid solution in the field of medium spans, since it combines both structural and aesthetic advantages [1]
The purpose of the present study is to analyze the dynamic behavior of tied-arch bridges in the field of medium and large span ranges, by evaluating the effects produced by the moving system on the bridge vibrations
In order to quantify the amplification effects produced by the moving loads over the static solution (ST), numerical results are presented in terms of dynamic amplification factors, defined as follows: ΦX = max (X, t = 0, . . . , T), XST
Summary
The tied-arch bridge represents a valid solution in the field of medium spans, since it combines both structural and aesthetic advantages [1]. Several works have been developed with the analysis of bridges travelled by trains, mainly for beam and girder bridges In this framework, earlier studies were devoted to investigate the vibrations of supported beams travelled by moving load or mass at constant speed, providing both analytical and numerical solutions [2,3,4,5]. Ju and Lin [21] have presented an advanced numerical model to investigate the vibration characteristics of steel tied-arch bridges traversed by high-speed trains They have proposed two simple design criteria to predict the train-bridge resonance effects, whose results were validated by means of numerical analyses.
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