This paper presents results of full-scale cyclic loading tests under constant deformation amplitude conducted to evaluate deformation capacity of welded beam-to-column connection adopted in a moment frame. Test specimens are designed and fabricated to investigate the effect of the weld access hole on deformation capacity. The relationships between ductility and cumulative plastic deformation is revealed from test results. The relationships between crack propagation at welded joint and strength of connection is evaluated regarding connection details and deformation amplitude.
