Quasi-static and fatigue performance of a cellular FRP bridge deck adhesively bonded to steel girders

Herbert Gürtler, Thomas Keller
2005
Journal paper

This paper describes the quasi-static and fatigue performance of hybrid bridge girders composed of cellular FRP bridge decks and steel girders. The FRP bridge deck is connected adhesively to the steel girders and acts as the top chord of the hybrid section. Compared to a reference steel girder, the stiffness and quasi-static load-carrying capacity of the hybrid girders were considerably increased due to composite action between the FRP decks and the steel girders. Failure due to quasi-static loading occurred in the FRP decks during yielding of the bottom steel flanges. The adhesive bond between the FRP decks and the steel girders showed no signs of damage due to fatigue loading. The results of the investigation showed that the well- established design method for steel-concrete composite girders with shear stud connections can essentially be used for the design of such FRP-steel girders. The principal modifications necessary for design are proposed. [All rights reserved Elsevier]

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Herbert Gürtler, Thomas Keller
2005
Journal paper

Abstract

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https://infoscience.epfl.ch/record/109231?ln=en

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Design of hybrid bridge girders with adhesively bonded and compositely acting FRP deck

Herbert Gürtler, Thomas Keller

Analytical prediction methods for axial stresses and deflections at the serviceability limit state and for ultimate failure loads are proposed for hybrid bridge girders consisting of FRP bridge decks adhesively bonded to steel girders. The methods allow for the consideration of partial shear connection layers in hybrid cross-sections. It was found that the adhesive bond always provides full composite action between FRP decks and steel girders, even in the case of flexible polyurethane adhesives with a layer thickness up to 50mm. For pultruded bridge deck systems, however, the webs or diagonals between the upper and lower face panels provide only partial shear connection of the upper face panels in the longitudinal bridge direction. The results of these prediction methods were compared to experimental results from full-scale girders with two different pultruded FRP bridge deck systems and were found to match well. [All rights reserved Elsevier]

2006

Fatigue Damage Factor Calibration for Long-Span Cable-Stayed Bridge Decks

José Joaquim Costa Branco de Oliveira Pedro, Alain Nussbaumer, Cláudio Alexandre Pereira Baptista

Part 2 of the Eurocode 3 (EN 1993-2) proposes a straight forward fatigue verification method using a single heavy vehicle model (FLM3) and a damage equivalent factor, lambda, to represent the fatigue damaging effects of the real traffic on road bridges. The method is very appealing for bridge design. However, the lambda-factor has limitations and is not defined in the EN1993-2 for some load cases or "span lengths" above 80 m, renamed here as "critical lengths". This is the case of cable-stayed bridge decks, where a combination of two internal forces-bending and compression (induced by the stays)-is a characteristic of this bridge system, and stay-cables, with specific shapes of influence lines. To address the above issues a variant solution of the Vasco da Gama Bridge is taken as the case study. In this paper, the results of the lambda-factor computed for different critical lengths are compared with previous studies and the original work that led to the current EN formulas for lambda. Based on these results, a constant lambda value for critical lengths above 80 m is proposed to update the EN for the "mid-span case". For the fatigue design of stays and steel girders, recommendations are given for determining the critical length based on the influence line of the bending moments.

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Fatigue (material)

In materials science, fatigue is the initiation and propagation of cracks in a material due to cyclic loading. Once a fatigue crack has initiated, it grows a small amount with each loading cycle, t

Girder

A girder ('gɜrdər) is a beam used in construction. It is the main horizontal support of a structure which supports smaller beams. Girders often have an I-beam cross section composed of two load-bear

Bridge

A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or railway) without blocking the way underneath. It is constructed for the purpose of providing pas