Amélioration du comportement sismique des assemblages à cisaillement simple des contreventements concentriques en X en acier de construction conventionnelle (type CC)

X-bracings are often used to support seismic loads of a steel structure. These are generally made of braces of HSS profile, one of which is continuous and the other is discontinuous. Their intersection is made of a gusset plate crossing and welding to the continuous brace which is bolted to transfer plates, themselves welding to the discontinuous braces. The connection is in single shear which introduces a local eccentricity. The experimental studies of Gélinas (2013) shown that the behavior of this type of design is characterized by the instability of the middle connection instead of the brace as provided by the CNB (2010) and the norm CSA S16 (2009). Also, these tests have demonstrated the considerable influence of the design of the connection on the behavior of the X-bracing.