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Design of 60° equal-leg steel angles according to CSA Standard S37-94 ARTICLE in CANADIAN JOURNAL OF CIVIL ENGINEERING · FEBRUARY 2011 Impact Factor: 0.56 · DOI: 10.1139/l95-068

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Available from: Murty K. S. Madugula Retrieved on: 07 March 2016

Design of 60' equal-leg steel angles according to CSA Standard S37-94

Can. J. Civ. Eng. Downloaded from www.nrcresearchpress.com by Renmin University of China on 06/04/13 For personal use only.

Murty K.S. Madugula and Seshu Madhava Rao Adluri

Abstract: Sixty-degree equal-leg steel angles find widespread application as leg members of triangular-base lattice towers. Compared to 90' angles of the same size, these angles are weaker in torsional-flexural buckling. The design of such angles is being explicitly covered for the first time in CSA Standard S37-94, "Antennas, towers and antenna-supporting structures." Recent experimental studies have shown that the design of 60" angles will be quite safe, if design is carried out using the expressions for factored axial compressive resistances given in CANICSA-S16.1-M89, taking into account only the effect of local buckling and flexural buckling about minor axis, and neglecting torsional-flexural buckling. The Canadian Standards Association Technical Committee on Antenna Towers also noted that the calculated resistances will still be less than the strengths according to the widely used Standard ANSIIASCE 10-90, "Design of latticed steel transmission structures," which considers all the three modes of buckling. The present paper explains the rationale behind the design procedure adopted by the Technical Committee.

Key words: angles, buckling, compression, design strength, schifflerized angles, specifications, steel towers, 60" angles.

Resume : L'utilisation de cornikres d'acier i ailes Cgales, comportant un angle de 60°, est largement r$andue dans la fabrication de pyldnes i treillis i section triangulaire. ComparCes aux comikres i angle de 90" de m&medimension, celles avec un angle de 60" sont plus faibles lorsque soumises au flambage en flexion et en torsion. La conception de ces comikres est traitCe de manikre explicite pour la premikre fois dans la norme CSA S37-94,