Estudio teórico experimental sobre el comportamiento a flexión de vigas I compuestas para el caso de almas no compactas con atiesadores verticales y horizontales

Abstract

This paper work out the theoretical and experimental study to negative moment of composite beams, formed by a metallic beam of non-compact web and compact flanges, reinforced with vertical and horizontal tiffeners, connected to a concrete slab of 10 centimeters’ height by means of arc shear connectors, welded to the top flange of the steel beam and embedded in the concrete. The study aims to determinate the influence of the use of stiffeners in the bending capacity, ductility and stiffness of six composite beams intentionally dimensioned so that they have a non-compact web. The test method consists in applying two symmetrical punctual loads on the steel profile in several load cycles, whereby the concrete slab and the reinforcing steel are subjected to traction and the free flange is compressed, making the composite beam work at negative moment. Deformation data shall be taken at the center light and unit deformations at three points on the steel profile. With the results, we proceed to analyze and compare the theoretical and real values, in order to expand the existing information on this type of elements, and in this way, generate criteria on the design and use of stiffeners.