Análise da estabilidade lateral em vigas de madeira lamelar colada (MLC)

Abstract

Timber is a renewable resource and is easily available in all regions of the country. For being a lightweight, economical, aesthetically pleasing and durable material when treated, the use as a construction material has been greatly development in urban contexts over time. Among the different structural composites obtained from this renewable raw material, glued laminated timber (glulam) stands out, being able to overcome large spans in various geometries. Therefore, allying the potential of MLC elements, with the growing need to build in a sustainable way, the present study reports the methodology and results of an experimental investigation with the objective of predicting the critical moment that leads MLC beams of the species Pinus to elastic lateral instability, exploring and comparing the applicability of existing theories to those values. Through the research carried out, it was possible to perceive the importance of the previous characterization of the wooden elements and the correct methodological choice to be applied in their definitions. When comparing the experimental results to those obtained from standardized formulations, there are similarities in the values obtained, mainly in relation to the theoretical method of the Project approved in the national vote of NBR 7190 (2011), statistically validated to the tested results. Regarding the theoretical formulation published by Timoshenko and Gere. (1963) presents a significant difference between the results obtained, since the equation of such theorization takes into account isotropic and non-orthotropic behavior materials such as wood. Which leads to evidence of the impact that the physical constitution of materials has on their mechanical behavior.