Avaliação experimental do comportamento mecânico de vigas duplo “I” com emendas longitudinais de alma

Abstract

The growth of the construction industry is becoming more competitive and the need for optimization in this area is increasing. The use of products derived from wood is gaining prominence in construction mainly due to the possibility of using wood from reforestation. The wood I-beam or I-Joists beams are an example of manufactured from wood and have a structural advantage that comes from their high stiffness and strength at the same time are light and easy to perform. The objective of this paper was study the "I-Joists" beams with double web in order to verify the influence of cross section model on the structural element, as well as evaluating the effect of the web union. The I beams were produced with two lumber flanges from Pinus Taeda and two OSB (Oriented Strand Board) web. Nine (09) double I-beams were produced and divided into three models, one of them seamlessly into the web, the other with asymmetrical seam in the web and the last one with symmetric splicing web. This work was characterized the material used in the flanges, theoretical and experimental structural analysis using the criteria of effective stiffness and rupture of the beams cross-section double "I". Due to the failure mode it is necessary to include stiffeners mainly in the region of the support and the points of load application, requiring more analisys in order to understand the behavior of web local buckling of I-beams.