Análise numérica do desempenho mecânico de ligações feitas com barras de fibra de vidro em estruturas de madeira

Abstract

In line with technological advances, the construction industry around of the world has sought more efficient construction systems in relation to aspects such as increased productivity, reduced material waste and meeting growing demand. The combination of wood with current technologies allows the use of this material in large structures, both in the idealization of modern projects and in the development of structural projects. Large structures, in height or in span, require structural elements with large transversal extensions generating connections between the elements. Therefore, connections have become an important and common element when wood is used as a structural element. This research analyzed the behavior of a wooden structure connection numerically when replacing traditional metallic connectors by connectors made from fiberglass bars (GFRP). A numerical simulation stage was carried out, with the purpose of calibrating a numerical model based on the results obtained in connection tests, using the Abaqus software. After securing the model, carry out a parametric study varying the following characteristics of the connections: (a) Diameter of the GFRP pins, (b) Number of pins, (c) Geometric characteristics of the connection and (d) Wood species. With the parametric study carried out, a multiple variable regression model was proposed to estimate the ultimate strength in connections, which presents a Correlation Coefficient (R²) of 75.64%. The proposed model was compared with the accuracy of the Johansen model and it was obtained that the Johansen model overestimates the rupture force values by up to 56% when compared with the values found by the proposed model. This situation is justified because the proposed model by Johansen overestimates the values of ultimate force in favor of safety.