This paper investigates the effect of beam section size and of beam-to-column connection type for mechanical behavior around the moment connection with FEM analysis. Firstly the bending moment of web connection was investigated by the global analysis. Secondly, factors affecting the initiation of ductile cracks was investigated by the local analysis using submodel. In conclusion, in the case of large section beams with bolted web type, the bending moment of web connection did not reach the estimated ultimate bending strength and the stress-strain concentration at the toe of the weld access hole was more noticeable.
