Investigation of welded plate girders to determine static carrying capacity of transversely stiffened plate girders was conducted at Lehigh Univ; theoretical considerations of study are presented; paper 2913 (Aug) covers bending strength, paper 2967 (Oct) covers shear strength and paper 2968 (Oct) covers interaction between bending and shear. (See also n ST6 Aug 1961 paper 2913 p 153-81)