Design Rules of Built‐Up Members in Load and Resistance Factor Design

Design Rules of Built‐Up Members in Load and Resistance Factor Design - Printable Version

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Design Rules of Built‐Up Members in Load and Resistance Factor Design - asim99 - 04-03-2013

The AISC-LRFD (American Institute of Steel Construction-Load and
Resistance Factor Design Specification for Structural Steel Buildings) Specification
provides rules for design of built-up members. The slenderness ratios of built-up
members that may buckle out-of-plane, say, about the Y-Y axis for a two-back-toback-
angle member are discussed. Based on the LRFD equation (E4-1) and the
usual concept of the effective length factor, a modification of the slenderness ratios
(Kl/r)m for built-up members as given in the present LRFD Specification is proposed.
The proposed formula with local effective length factor Km is concise, simple,
and physically clear. It is consistent with the effective length factor recommended
by the LRFD Specification, and has only one equation considering the
effects of shear and connectors on buckling of built-up members. The calculated
results of the proposed formula are found to be in good agreement with available
test results.

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