Thin-Wailed Structures 15 (1993) 1-13 Local Buckling of I-Section Beams with Longitudinal Web Stiffeners M. Azhari & M. A. Bradford* School of Civil Engineering, The University of New South Wales, PO Box 1, Kensington, New South Wales 2033, Australia (Received 17 July 1991; accepted 3 March 1992) ABSTRACT The semi-analytical complex finite strip method is used to study the elastic local buckling of 1-sections in bending containing a longitudinal stiffener attached to the web. The optimum position of this stiffener is calculated to maximise the web local buckling stress. The local buckling of the stiffener is then considered, and recommendations are made regarding the stiffener proportions that would cause yield of the stiffener before it buckled locally. NOTATION a Depth of stiffener below compression flange Af Area of flange Aw Area of web bf Breadth of flange bs Breadth of stiffener bw Breadth of web E Young's modulus of elasticity ks Stiffener buckling coefficient L Buckling half-wavelength Mu Maximum moment *To whom all correspondence should be addressed. 1 Thin-Wailed Structures 0263-8231/92/$05.00© 1992 Elsevier Science Publishers Ltd, England. Printed in Great Britain