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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 />

Ends of the main members<br />

not prepared for full contact<br />

in bearing<br />

Use packs if required<br />

Moment connections 753<br />

External flange cover plates Internal flange cover plates<br />

Fig. 26.23 Column splice with ends not prepared for bearing<br />

areas while any bending moments are normally carried by the flange cover plates<br />

alone.<br />

The maximum compressive and tensile forces in the flange cover plate is given<br />

by the following two expressions:<br />

F<br />

F<br />

M Ê Af<br />

ˆ<br />

= + F<br />

D Ë A ¯<br />

M Ê Af<br />

ˆ<br />

= -F<br />

D Ë A ¯<br />

1max c<br />

2max cd<br />

where M is the nominal moment due to factored dead and live imposed loads at<br />

the floor level immediately below the splice,<br />

F c is the axial compressive force due to factored dead and imposed loads,<br />

F cd is the axial compressive force due to factored dead loads,<br />

D is the overall depth of the smaller column (for external flange cover plates)<br />

or the centreline to centreline distance between the flange cover plates (for<br />

internal flange cover plates),<br />

A f is the area of one flange of the smaller column,<br />

A is the total area of the smaller column.<br />

26.3 Moment connections<br />

26.3.1 Introduction<br />

for maximum compressive force<br />

for maximum tensile force<br />

The following three principal forms of beam to column moment connection are<br />

considered in this section:

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