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Comprehensive stability design of planar steel members and framing systems via inelastic buckling analysis

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Abstract

This paper presents a comprehensive approach for the design of planar structural steel members and framing systems using a direct computational buckling analysis configured with appropriate column, beam and beam-column inelastic stiffness reduction factors. The stiffness reduction factors are derived from the ANSI/AISC 360-16 Specification column, beam and beam-column strength provisions. The resulting procedure provides a rigorous check of all member in-plane and out-of-plane design resistances accounting for continuity effects across braced points as well as lateral and/or rotational restraint from other framing. The method allows for the consideration of any type and configuration of stability bracing. With this approach, no member effective length (K) or moment gradient and/or load height (C b ) factors are required. The buckling analysis rigorously captures the stability behavior commonly approximated by these factors. A pre-buckling analysis is conducted using the AISC Direct Analysis Method (the DM) to account for second-order effects on the in-plane internal forces. The buckling analysis is combined with cross-section strength checks based on the AISC Specification resistance equations to fully capture all the member strength limit states. This approach provides a particularly powerful mechanism for the design of frames utilizing general stepped and/or tapered I-section members.

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Authors and Affiliations

  1. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA

    Donald W. White, Woo Yong Jeong & Oğuzhan Toğay

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  1. Donald W. White
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  2. Woo Yong Jeong
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  3. Oğuzhan Toğay
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Correspondence to Donald W. White.

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White, D.W., Jeong, W.Y. & Toğay, O. Comprehensive stability design of planar steel members and framing systems via inelastic buckling analysis. Int J Steel Struct 16, 1029–1042 (2016). https://doi.org/10.1007/s13296-016-0070-3

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  • DOI: https://doi.org/10.1007/s13296-016-0070-3

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