Dimensionamento de uma treliça de madeira segundo as normas brasileira e americana

Abstract

Wood is a traditional construction material widely used in structural applications such as roofing systems and buildings. While its use remains limited in Brazil, it is extensively adopted in countries like the United States. Each country has established specific standards for the design of wood structures to ensure safety and performance. In Brazil, the design follows ABNT NBR 7190-1:2022, whereas in the United States, it adheres to the NDS 2018 (National Design Specification for Wood Construction), developed by the American Wood Council (AWC). This study applies and compares both standards in the structural design of a timber truss used in roofing, employing the Allowable Stress Design Method and the Limit States Design Method. Results indicate significant differences related to permissible wood types, safety factors, and load considerations. The American standard led to lower internal forces and deflections, while the Brazilian standard resulted in higher compression, tension, and displacement values. These findings emphasize the critical impact of normative criteria on the safety and performance of wood structures.