Slab Cracking Control in Continuous Steel-Concrete Bridge Decks

Memoria tratta da "The New Boundaries of Structural Concrete: Session D – Concrete Quality Control on Site", ACI IC - Ancona 2011

In this paper a study on the effectiveness of various casting techniques to control slab tensile stresses during the construction of continuous decks is reported. Main features regarding the early age concrete behavior and their modeling for the structural analysis are firstly discussed. Successively, the efficiency of the main casting techniques in controlling the cracking tendency of the reinforced concrete slab is evaluated. With reference to a continuous three-span composite bridge, numerical results obtained with a dedicated computer program are shown: stresses due to various actions are considered separately allowing to understand the mechanisms that produce tensile stresses in the slab and to evaluate the effectiveness of the various construction systems considered. Finally simplified procedures to compute the stress state in the slab due to the construction stages are presented.

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