Ligação mista viga-pilar resistente a momento

Abstract

The use of steel and concrete composite structures in Brazil has been increased in the last decades. However, there are only a few references about the behavior of beam-to-column composite moment connections. These connections are used in moderate to high-rise buildings where the lateral-force-resisting system consists of composite frames. The Brazilian standards for steel (ABNT NBR 8800:2008) and concrete (ABNT NBR 6118:2007) and the international standards do not provide specific design and calculation procedures for moment-resisting composite connections. A design approach for moment connections is found in literature, where the steel column embedded in the concrete column is interrupted at the joint to allow the steel beam to be continuous through the joint. However, this method has some disadvantages, such as they increase in the number of parts for transportation and assembly and the needs of field weld. Facing this scenario, this work proposes to perform the preliminary study of a beam-to-column moment-resisting composite connection with end plate bolted at the steel column flange. Numerical simulations were performed by the finite element method, using the ANSYS software. The physical nonlinearities of materials were considered, allowing to identify the major failure mechanisms and to quantify the connection flexural strength. Parametric analyses were performed to evaluate the influence of geometric and physic variables on the connection strength. Finally, a preliminary mechanical model was proposed to estimate the beam-to-column connection flexural strength, which should be calibrated by experimental tests suggested for future works.