H-shaped steel column base member and welding thereof

A steel column base plate member for connecting an H-shaped steel column member to a concrete foundation, which base plate member is a unitary body comprising a substantially planar bottom plate portion engageable with said concrete foundation, a projection upwardly extending from the planar bottom plate portion and having a top surface whose shape is substantially identical to cross sectional shape of the steel column member, a web part of a top surface of said projection in opposition to a web of said column member having a width broader than that of the said web of the column member so as to effect sufficient fillet welding therewith, J-shaped welding grooves formed along both edges of said top surface of said projection facing to lower ends of flanges of said column member extending from outer peripheries of the top surface of said projection so as to effect J-shaped groove welding between said lower ends of the flanges and the J-shaped welding grooves, a sloped top surface formed between said projection to said bottom plate portion so as to increase the thickness thereof as the planar bottom plate portion extends toward said projection, and abutments formed on the planar bottom portion in a sufficient thickness and having anchor bolt holes bored therethrough.