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Steel Designers Manual - TheBestFriend.org

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This material is copyright - all rights reserved. Reproduced under licence from The <strong>Steel</strong> Construction Institute on 12/2/2007<br />

To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.<strong>org</strong>/<br />

<strong>Steel</strong> <strong>Designers</strong>' <strong>Manual</strong> - 6th Edition (2003)<br />

512 Members with compression and moments<br />

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t<br />

t<br />

tt<br />

(D)<br />

(q)<br />

(3)<br />

Fig. 18.1 Occurrence of beam-columns in different types of steel frames. (a) Roof truss –<br />

top chord members subject to bending from purlin loads and compression due to<br />

overall bending. (b) Simple framing – columns subject to bending from eccentric<br />

beam reactions and compression due to gravity loading. (c) Portal frame – rafters<br />

and columns subject to bending and compression due to frame action<br />

loaded members. Sometimes the transfer of loads from secondary members into the<br />

main booms of trusses is arranged so that they do not coincide with joints, leading<br />

to beam action between joints being superimposed on the compression produced<br />

by overall bending.<br />

t

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