Análise teórica e experimental de treliças metálicas planas do tipo steel joist.

Abstract

Because steel has many advantages, being the main ones, the high strength, the low weight and the fast execution (there is no curing time, as in the case of concrete), the structural system analyzed theoretically and experimentally in the present work arises as an interesting option in what refers to the current constructions. Steel Joist is a structural system made up of two or more metal flat trusses, with top and bottom chords parallel or partially sloped, side locking to ensure stability and resilience of the system. It is commonly used as structural support for floors and roofs. The system also allows the execution of large spans, allowing flexibility in the layout of the building, reduction of the right foot due to the ease of passage of pipes, and economy in the construction, since it causes slimmer sections of beams and pillars, causing in foundation economy. Due to the press limitations of the laboratory where the test was presented, it was sought to analyze the structural element in isolation, being composed by a metallic flat truss and its lateral locking. The test carried out in the laboratory is the Stuttgart test to verify the carrying capacity of the prototype. By analyzing the results obtained by the theoretical design and the experimental results, it is understood that the prototypes presented experimental resistance (load applied by the press) higher than the estimated calculation strength (estimated load applied by the press). The four prototypes were designed according to ABNT NBR 8800: 2008.