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 behaviour and their modelling 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 evaluate. 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 mechanism that produces tensile stresses in the slab and to evaluate the effectiveness of the various construction system considered. Finally simplified procedures to compute the stress state in the slab due to the construction stages are presented.
Slab cracking control in continuous steel-concrete bridge decks / Dezi, Luigino; Leoni, G.. - 2011:(2011), pp. 311-324. (Intervento presentato al convegno 2nd workshop on the new boundaries of structural concrete tenutosi a Ancona nel 15-16 september 2011).
Slab cracking control in continuous steel-concrete bridge decks
DEZI, LUIGINO;
2011-01-01
Abstract
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 behaviour and their modelling 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 evaluate. 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 mechanism that produces tensile stresses in the slab and to evaluate the effectiveness of the various construction system considered. Finally simplified procedures to compute the stress state in the slab due to the construction stages are presented.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
