Abstract
Results of tests on 13 double-angle beams bending about the geometric axis are presented. Nine regular size and two ultra-large size angles were included in the investigation. The test failure moments were 2–32% greater than the plastic moments of resistance and 55–95% greater than the nominal flexural strengths calculated as per the American Institute of Steel Construction ‘Specification for Load and Resistance Factor Design of Single-angle Members’ issued in 1993. For the angles tested, the deflections at 1.5 times the yield moment were only 1.53–1.74 times the deflections at first yield. Failure strains in compression exceeded the yield strain even for a specimen with a width-to-thickness ratio of 19.0. It is concluded that the nominal resistances for angle members bending about the geometric axis computed using the current AISC-LRFD Specification for Single Angles are highly conservative and there is need to revise the pertinent clauses in the specification in the interest of design economy.
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