Verificação da segurança em ligações de madeira com parafusos metálicos, submetidas a forças normais, e com dois planos de corte, conforme NBR 7190/2022

Abstract

Studying the effect of screwed connections in wood is of utmost importance, as this type of connection in one of the most commnly used in wooden structures.Screwed connections are directly linked to the durability and safety of structures.This work aims to verify the structural safety of screwed connections with two cutting planes subjected to compression parallel to the fibers, in order to demonstrate the following failures: a) Embedment in the side plates, b) Embedment in the central plate, c) Simple bending in the screw. Based on the parameters of NBR 190(2022), three different connections were designed, each with four test speciments. Subsequently, the test specimens were tested in the laboratory to determine the failure loads and compare them with the design. The design was carried out with the same arrangement, number, and diameters of screws, only varying the thickness of the wooden plates. It was concluded that NBR 7190(2022) provides the necessary safety for screwed connections in wood with two cutting planes, subjected to parallel compression.