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An experimental research program on end-plate beam-to-column composite joints under monotonical loading is presented. The major focus relates to the identification of the contribution of the concrete confinement in composite columns to the behaviour of the joint, coupled with a thorough assessment of the various loading possibilities, ranging from symmetric and anti-symmetric loading on internal nodes to external nodes under hogging and sagging moments, typical in seismic regions. Comparison with current methodologies in the analysis of composite joints is also presented.