Avaliação de uma viga de concreto pré-moldado para pontes rodoviárias com vão entre 30 e 40 metros

Abstract

Bridge decks made of slab supported by prestressed precast beams is one of the most used methods worldwide for superstructure conceptions. Among its benefits, it is possible to list quick execution, efficiency in big spans transpositions and economic advantage, since they can be developed in parallel to the infrastructure. The present work aims to determine the allowable range for a prestressed concrete beam, with a cross-section type I, to a road bridges deck. It was considered a class 45 bridge, with 10 m of width and spans varying from 25m to 45 m. It was adopted different options for decks, with interaxis varying from 0,75 m to 1,5 m, with additions of 0,25 m. The chosen material to compose beams was a isotropic concrete C40 and to slab was a orthotropic concrete C40, in order to all longitudinal flexure stress was weathered by beams. For active reinforcement, steel

CP190RB 12,7 mm chordae was used in 9 arrangements. The maximum applicant efforts were compared to the resistant efforts in an Ultimate and Serviceability Limit States approach, being the results expressed on identification graphics. The maximum allowable span was 35,6 m, limited by Ultimate Limit State.