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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 />

1090 Bending moment, shear and deflection<br />

'!4<br />

BUILT—/N BEAMS<br />

parabolic total /oao W<br />

JRa<br />

W/2<br />

F4axJ<br />

1.3 WL3<br />

d,,, 384E!<br />

Any symmetrical load W r<br />

A ______<br />

symmetrical diagram<br />

NMB<br />

MA = M8 —A,JL<br />

where A5 is the area of the 'free'<br />

bending moment diagram<br />

A<br />

RB<br />

A,<br />

JM8<br />

A -M5=-WL//O<br />

A =R8 = W/2<br />

fr- X, -<br />

H-X---<br />

- - I The fic.re shown<br />

is ha/f the bending<br />

* + moment diagram<br />

C 1* and +7<br />

LareC.GI<br />

A5x —AIX1<br />

lmaxatC ZET<br />

Where A' is the area of the fixing<br />

moment diagram<br />

rA<br />

2br<br />

2 -2br----—-<br />

aab r&_<br />

RA R8 W/2<br />

O•4WL3<br />

dma 384 (2'<br />

con,c*ment<br />

parabo/p<br />

MAV NMB<br />

Aq rM8i.._WL/2O<br />

a rb<br />

CM. f(Ja—L)M8c -M(3b-L)<br />

When<br />

'4I<br />

= P8 = slope of moment diagram<br />

M#M M#M<br />

Eab<br />

When '2/L = in,<br />

M. L2m2(/_m)2(1_2m)<br />

2E%<br />

For ant/clockwise moments<br />

reverse the deflect/ons

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