Verificação da segurança em ligações de madeira com pinos metálicos do tipo prego conforme NBR 7190/1997

Abstract

It is important to study the peculiarities of the joints in timber structures as they, in the event of breakage, endanger durability and structural safety. This work proposes to verify the safety of joints nailed in pieces of wood subjected to compressive stresses, the following forms of rupture will be studied: a) bending of metal pins; b) wood inlay, as well as the position of the wood fibers will also be taken into consideration, ranging from parallel or perpendicular to the main fibers of the wood under study. According to the requirements of NBR 7190 (ABNT, 1997) four different types of connection were dimensioned, where the diameter and number of pins, and position of the main fibers of the wood were varied, for the subsequent compression test to determine the maximum load. that, in fact, each link can support and compare it with the result calculated from NBR 7190 (ABNT, 1997). The dimensioning of the links considering the wood thickness, diameter, quantity and nail spacing was performed for Eucalyptus grandis and Pinus elliottii. The results obtained were satisfactory in almost all tests, only one group of specimens obtained results below those calculated by the norm, the others obtained better results than expected. It is concluded, therefore, that the standard offers safety regarding the sizing of nail-type mechanical connections.