Análise experimental de vigas pré-formadas de concreto armado à flexão e ao cisalhamento / Experimental analysis of reinforced concrete preformed beams to bending and shear

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Reinforced concrete preformed beams are structural elements which present a thin superficial precast concrete layer that defines their geometrical shapes. This superficial layer functions as a formwork that will be incorporated to the beam after the introduction of cast in loco concrete, which will consolidate the structure. This construction system presents advantages when compared to the conventional construction system as the reduction of wood consumption used to produce formworks and supports. Comparing to the precast structural system, the major advantages are the transport cost reduction and the quick assembling of the structural elements due to its lower self weight. Another advantage is the greater stiffness of a preformed structure, when compared to a precast one, because it is possible to make monolithic joints between the structural elements using proper reinforcement combined with cast in loco concrete. This research aims to analyze experimentally the behavior of preformed beams under bending and shear carrying out tests over 9 preformed beams and 3 common reinforced concrete beams as reference. The beams have width of 110 mm, 340 mm height and length of 2,500 mm. Experimental results will be compared to the ones obtained using the recommendations of the Brazilian design code and the main international codes. Results of vertical deflection, strains on concrete compressed zone, strains on flexural and shear reinforcement and cracking pattern will be presented and analyzed.

ASSUNTO(S)

flexão bending shear viga pré-moldada preformed beam precast beam engenharia civil cisalhamento viga pré-formada

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