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Second-order moments in steel portal frames
With the advent of modern steel design codes the structural designer is required to consider second-order moment effects, which complicates the design process. The significance of second-order effects in single storey single bay rigid jointed portal frames is addressed in this paper. It is concluded that the relative magnitude of second-order moment effects is small in this type of steel frame. For the three-storey frame analysed by Kulak the second-order effects are in the order of 3.4 % for gravity and wind loads. For the gravity load case the pseudo lateral loads increase the moments by approximately 11 %. For the two-storey frame analysed by the, where only the centre frame is resisting the sway moments, the second-order moments effects are in the order of 1 to 5 %. For the gravity load case the pseudo lateral loads produce significant moments in especially the lower storey. For the pitched-roof portal frames analysed in this paper the second-order effects are less than 2.5 %. The pseudo lateral loads increase the bending moments of the gravity load case by less than 1.5 %.
Second-order moments in steel portal frames
With the advent of modern steel design codes the structural designer is required to consider second-order moment effects, which complicates the design process. The significance of second-order effects in single storey single bay rigid jointed portal frames is addressed in this paper. It is concluded that the relative magnitude of second-order moment effects is small in this type of steel frame. For the three-storey frame analysed by Kulak the second-order effects are in the order of 3.4 % for gravity and wind loads. For the gravity load case the pseudo lateral loads increase the moments by approximately 11 %. For the two-storey frame analysed by the, where only the centre frame is resisting the sway moments, the second-order moments effects are in the order of 1 to 5 %. For the gravity load case the pseudo lateral loads produce significant moments in especially the lower storey. For the pitched-roof portal frames analysed in this paper the second-order effects are less than 2.5 %. The pseudo lateral loads increase the bending moments of the gravity load case by less than 1.5 %.
Second-order moments in steel portal frames
Momente zweiter Ordnung in Stahlportalrahmen
Rendsburg, B.W.J. van (author) / Henderson, N.C. (author)
Structural Steel Developing Africa, 1996 ; 351-360
1996
10 Seiten, 2 Bilder, 5 Tabellen, 9 Quellen
Conference paper
English
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