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Strength of shear connection in composite bridges with precast decks using high performance concrete and shear-keys

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Abstract

In this paper, a connection between precast beam and precast slabl to be used in decks of precast composite bridges is studied. The difference between this connection and the common connection used in bridge construction is that in this paper the steel connector is associated with a shear-key which is formed on the top face of the precast beam, and a high, performance concrete is used to fill out the shear pockets. The connector is formed by steel bars bent in a hoop form, which are inserted in pockets of the precast slab. The connection is made filling out the shear pockets with steel fiber reinforced concrete. Push-out tests were carried out to evaluate the strength of the shear connection. From these tests expressions based on a shear-friction model are proposed to evaluate the strength of the shear connection taking into account the compressive strength of the concrete cast in the pocket, the diameter of the connector and the addition of steel fibers to cast-in-place concrete. These expressions were shown to be appropriate to evaluate the strength of a shear connection, since the failure of precast concrete is avoided near the connection.

Résumé

Dans cet article, on étudie le joint entre poutres et dalles pré-fabriquées en béton, employées dans les plateaux des ponts composés, préfabriqués. La différence entre ce joint et ceux habituellement employés dans la construction de ponts demeure, entre l'association des connecteurs métalliques avec des joints crantés confectionnés sur le côté, supérieur de la poutre pré-fabriquée et l'emploi de béton de haute performance pour remplir la niche de la dalle. Les connecteurs métalliques sont formés d'armatures en acier courbé en boucle qui sont introduites dans les niches de la dalle pré-fabriquée. Le joint est à posteriori réalisé en remplissant les niches avec du béton renforcé de fibres d'acier. On a réalisé des essais de cisallement direct à partir desquels sont proposées des formules empiriques basé sur théorie du frottement-cisaillement pour l'évaluation de la résistance du joint. Celles-ci prennent en considération la résistance elle-même à la compression du béton moulé dans les niches, le diamètre du connecteur et l'addition de fibres d'acier au joint. Ces formules se sont montrées convenables à l'évaluation de la résistance du joint, pourvu que la rupture des piéces pré-fabriquées soit évitée à sa proximité.

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Abbreviations

Es :

modulus of elasticity of steel

Fexp :

maximum load of connection obtained from tests

R:

correlation factor

Vf :

volume of fibers in percent

fc, fcm :

average compressive strength of concrete obtained from tests on 100 mm×200 mm cylinders

fctm, sp :

average tensile splitting strength of concrete obtained from tests on 100 mm×200 mm cylinders

fy :

yield strength of steel

δm :

average slide at maximum load of connection in push-out tests

εs :

strain of connector at maximum load of connection in push-out tests

φs :

diameter of connector

ρ:

geometric ratio of transversal steel in connection

σn :

normal stress by connector on shear-off plane at maximum load

τu, τu,1, τu,2 :

ultimate shear strength of connection obtained from tests and using empirical expressions

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Authors and Affiliations

  1. Civil Engineering School, Federal University of Goiás, Brazil

    D. L. Araújo

  2. Engineering School of São Carlos, São Paulo University, Brazil

    M. K. El Debs

Authors
  1. D. L. Araújo
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  2. M. K. El Debs
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Araújo, D.L., El Debs, M.K. Strength of shear connection in composite bridges with precast decks using high performance concrete and shear-keys. Mat. Struct. 38, 173–181 (2005). https://doi.org/10.1007/BF02479342

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  • DOI: https://doi.org/10.1007/BF02479342

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