The chapter presents results of a study concerning the second-order behavior of unbraced single-bay pitched-roof steel frames and proposes, validates, and illustrates the application of an efficient methodology to design this kind of commonly used frames. After characterizing relevant frame buckling modes and second-order effects, and addressing the calculation of the associated bifurcation loads and secondary bending moments, the chapter discusses the incorporation of these concepts in an efficient design procedure. In particular, the second-order behaviors of orthogonal beam-and-column and pitched-roof frames are qualitatively different because of the rafter slope. The chapter illustrates the proposed concepts and methods through the presentation of numerical results involving fixed and pinned-base frames.
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