A Strategy of Numerical Analysis of Space Truss Connections with Stamped Bar Ends

Abstract

This paper describes a strategy for numerical simulation using the Finite Elements Method to analyze connections in steel space trusses composed of circular section bars with stamped ends. This type of space truss is widely used in Brazil and the bar ends are stamped to compose the connection. This is an inexpensive solution, but poses several structural problems, thus requiring studies to establish criteria and limits for its use. The most important variables of connections and structural behavior, such as eccentricities, section variation at the bar ends, and physical and geometrical nonlinearity were introduced into the numerical model. The interaction between the bars (relative displacement and sliding in the nodal region) was simulated by means of contact elements. The numerical analysis involved modeling of a complete joining of the structure with shell elements, which were inserted at different points of the space truss. The results were satisfactory, enabling us to evaluate how the behavior of the connections affects the strength and collapse mode of the space trusses.