The New Brazilian Timber Structures Code Nbr7190: 2022

Abstract

The first Brazilian Timber Structures Code was published in 1951 under the name of NB11: Design and construction of timber structures, with a deterministic design method and composed of 16 pages without annex. In February of 1982, it was renamed NBR7190: 1982 without any modifications. In 1992 start the new study of this code using the limit states design method. This version, using the load and resistance factored design (LRFD), was published in 1997 by the Brazilian Association of Technical Standards with the emphasis on the utilization of hardwoods. A new study started in 2013 in order to consider all the new wood composite industrialized materials and connections. Considering the huge amount of hardwoods in Brazil, new test methods were developed in order to calibrate the new materials. This paper aims to present the New Brazilian Code for Timber Structures Design, NBR7190: 2022, relating the new revision for structural grading recommendations for softwoods and hardwoods planted in Brazil. Details of structural and constructive systems, Glulam, CLT, fire and preservation recommendations for design and new types of connections are also presented.The New Brazilian Timber Structures Design Code NBR7190: 2022 is composed of 7 parts, that are: Part 1: Design criteria; Part 2: Test Methods for visual and mechanical grading of structural lumber; Part 3: Test Methods for characterization of defect-free specimens for native timber; Part 4: Test Methods for characterization of structural lumber; Part 5: Test Methods for determination of strength and stiffness of connections; Part 6: Test Methods for characterization of glued laminated timber; Part 7: Test Methods for characterization of cross laminated timber.These six test methods for structural properties, grading, quality control of Glulam and CLT, and connections are also presented in related papers. Part of these codes is based on international codes such as EUROCODE and ISO.