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UNIT -31.Two channel section without bend lip 200mmx50mm are connected with web to act as

a beam , the thicness o! channel is "mm the e!!ecti#e span o! simpl$ supported beam

"m, determine the maximum U%& inclusi#e o! sel! wei'ht which can be supported b$

beam, the beam is laterall$ supported throu'hout its len'th .

Tae !$(2"00'!)cm2.

SOLUTION:

Note: max permissible bending stress is calculated along the compression zone.

For unstifened element:

IS !" #pg"$

*1+ or w)t not 'reater than 530)!$%&'!( t #r

%&'!()(* &)!mm

+,t & )!,) &"!

'$!-,/0 & '$!,-,1)!! & "!.1 2 "!3"!.1

Fc &!*/0

4ermissible bending stress&!.* x 1)!! & "))! 5g/,cm1

4roperties o/ one channel IS "" 4g "'

Ixx & ') cm)

I00 & 11." cm)

6xx & '.)cm$

600 & '.') cm$

For 1 channel

Ixx & ') x 1 &""*cm)

6xx & '.) x 1 & ""*. cm$

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7,I & 8 , 9

7,I & Fc,9

7O7NT OF ;SIST

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