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Article Dans Une Revue The Baltic Journal of Road and Bridge Engineering (BJRBE) Année : 2010

Local Buckling influence on the moment redistribution for continuous composite beams in bridges

Samy Guezouli
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Mohammed Hjiaj
Quang Huy Nguyen

Résumé

The present paper is concerned with the elastic design optimisation of continuous composite beams. This optimisation is based on the analysis of the beam in the inelastic range including the concrete creep and shrinkage, the tension stiffening and temperature difference effects as well as the possible local buckling instability. The finite element program "Pontmixte" (adapted to study continuous beams at real scale with short time computation) is first presented with its different sections: Pre-design (in accordance with Eurocode specifications), Non linear finite element (FE) calculation and Post-processing. In order to valid the proposed model, the numerical results are compared to experimental test ones on the example of a twin-span beam in reduced scale (7.5m length for each span) without taking into account the local buckling phenomenon avoided in the experimental test by using web-stiffeners. After that, special attention is paid to study the influence of the local buckling instability on the moment redistribution percentages from hogging to sagging zones. The application concerns different 3-span beams of bridge at real scale with medium span lengths (40m - 60m - 40m). The post-buckling behaviour represented by moment-rotation curves (M-) is obtained by the simulation of a simplified 3D model using Castem FE code. The hyperbolic decreasing of these curves is computed in "Pontmixte" using a specific tortional spring FE in order to take into account the local buckling phenomenon. The influence of this instability on the moment redistribution percentages calls the Eurocode predictions into question.

Domaines

Génie civil
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Dates et versions

hal-00966793 , version 1 (28-03-2014)

Identifiants

Citer

Samy Guezouli, Mohammed Hjiaj, Quang Huy Nguyen. Local Buckling influence on the moment redistribution for continuous composite beams in bridges. The Baltic Journal of Road and Bridge Engineering (BJRBE), 2010, 5 (4), pp.207-217. ⟨10.3846/bjrbe.2010.29⟩. ⟨hal-00966793⟩
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