The paper analyzes the influence of the slab cracking in the fatigue assessment of continuous composite decks by considering the effects of slab casting sequences and the shrinkage components (thermal, endogenous and drying). A numerical procedure for the stress calculation accounting for the tension stiffening of the slab longitudinal rebars is presented. The long term effects of casting sequences and concrete shrinkage are analysed with a simplified procedure based on the application of the modular ratio method. With reference to a realistic continuous twin girder composite deck the fatigue verification of the longitudinal girders is carried out by considering three different casting modalities. The obtained results show the important role of the slab casting sequences in the stress range calculation and the remarkable influence of the slab cracking in the fatigue assessment.

Slab cracking influence in the fatigue assessment of continuous composite bridge decks / Dezi, Luigino; M., Formica; Gara, Fabrizio; Leoni, G.. - STAMPA. - (2013), p. Paper ZPoster_03_0183_FULL. (Intervento presentato al convegno The 36th IABSE Symposium tenutosi a Kolkata, India nel 24-27 September).

Slab cracking influence in the fatigue assessment of continuous composite bridge decks

DEZI, LUIGINO;GARA, Fabrizio;
2013-01-01

Abstract

The paper analyzes the influence of the slab cracking in the fatigue assessment of continuous composite decks by considering the effects of slab casting sequences and the shrinkage components (thermal, endogenous and drying). A numerical procedure for the stress calculation accounting for the tension stiffening of the slab longitudinal rebars is presented. The long term effects of casting sequences and concrete shrinkage are analysed with a simplified procedure based on the application of the modular ratio method. With reference to a realistic continuous twin girder composite deck the fatigue verification of the longitudinal girders is carried out by considering three different casting modalities. The obtained results show the important role of the slab casting sequences in the stress range calculation and the remarkable influence of the slab cracking in the fatigue assessment.
2013
9783857481284
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/163748
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