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Structural Engineering and Mechanics Volume 38, Number 6, June25 2011 , pages 825-847 DOI: https://doi.org/10.12989/sem.2011.38.6.825 |
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Limiting the sway on multi-storey un-braced steel frames bending on weak axis with partial strength connections |
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Mahmood Md. Tahir and Shek Poi Ngian
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| Abstract | ||
| This paper investigates the design using wind-moment method for semi-rigid un-braced steel frames bending on weak axis. A limiting sway method has been proposed to reduce the frame sway. Allowance for steel section optimization between moment of inertia on minor axis column and major axis beam was used in conjunction with slope-deflection analysis to derive equations for optimum design in the proposed method. A series of un-braced steel frames comprised of two, four, and six bays ranging in height of two and four storey were studied on minor axis framing. The frames were designed for minimum gravity load in conjunction with maximum wind load and vice-versa. The accuracy of the design equation was found to be in good agreement with linear elastic computer analysis up to second order analysis. The study concluded that the adoption of wind-moment method and the proposed limiting sway method for semi-rigid steel frame bending on weak axis should be restricted to low-rise frames not more than four storey. | ||
| Key Words | ||
| limiting sway method; partial strength connection; un-braced frame; weak axis; windmoment method | ||
| Address | ||
| Mahmood Md. Tahir and Shek Poi Ngian: Steel Technology Center, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia | ||