It is presented a numerical procedure able to analyse the structural behavior of steelconcrete
composite beams subjected to moving loads, considering the actual cyclic nonlinear
relationship between the shear force and the slip of the connectors. The procedure allows to
determine the oscillograms of the slip and the shear force of each connector corresponding to the
transit of an assigned loading pattern. Fatigue checks, based on the strain-life approach can be
carried out using such a numerical tool. The procedure was used to study the cyclic behavior of
the connection of a 40 m span simply supported bridge-type beam subjected to a severe loading
model: fatigue model 1 (ENV 1991-3) with a heavy abnormal 15 axles vehicle (3600 kN). The
results allowed to assess the damage accumulated in the connectors due to one thousand transits
of the considered load. Significant damage occurs in the studs close to mid-span.
