Steel Designers Manual - TheBestFriend.org

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This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) 374 Local buckling and cross-section classification rolled beams and columns bIT == bb i tJd df9iJD B 1b1 rolled rhs b=B—3t channels d=D—3t angles tees chs Tb b df1r In' d[lHt T T b b b T b I ___ HT T I 1j b T Fig. 13.1 Structural cross-sections T t
This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) Cross-sectional dimensions and moment–rotation behaviour 375 Fig. 13.2 Local buckling of column flange unlikely to affect significantly their load-carrying capacity when used as beams or columns. Greater care is, however, necessary when using fabricated sections for which the proportions are under the direct control of the designer. Also, coldformed sections are often proportioned such that local buckling effects must be accounted for. 13.2 Cross-sectional dimensions and moment–rotation behaviour Figure 13.3 illustrates a rectangular box section used as a beam. The plate slenderness ratios for the flanges and webs are b/T and d/t, and elastic stress diagrams for both components are also shown. If the beam is subject to equal and opposite end moments M, Fig. 13.4 shows in a qualitative manner different forms of relationship between M and the corresponding rotation q. Assuming d/t to be such that local buckling of the webs does not occur, which of the four different forms of response given in Fig. 13.4 applies depends on the compression flange slenderness b/T. The four cases are defined as: (a) b/T £ b1, full plastic moment capacity Mp is attained and maintained for large rotations and the member is suitable for plastic design – plastic cross-section (Class 1).
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