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Slenderness - Wood - Bending

Slenderness - Wood - Bending

Slenderness - Wood - Bending

(OP)
I have a question about the slenderness requirement  for bending in ANSI NDS 97'... Page 17

My Span is 10 ft. = 120 in. = Lu
Member Subject to Bending = 2x6 = 1.5x5.5
Effective Length for Lu/d > 14.3 is Le= 1.84*Lu = 220.8 in
Slenderness Ratio = Rb = ((Le*d)/(b^2))^(1/2) = 23.23
Rb recommended less than 50.

@ Rb = 50 a 2x6 can span 46.5 ft?????

Does this sound right?

Something seems off.... maybe I'm missing something.

RE: Slenderness - Wood - Bending

Use (L/D1) or (L/D2) whichever is larger.  The slenderness ratio may not exceed 50 except that during construction it may not exceed 75.

L/D1<50    L/5.5<50    L<275 inches or 22.9 Ft allowable length

RE: Slenderness - Wood - Bending

A 2x6 will probably never span 46+ feet.  There's more to it than that of course.  That requirement was developed mroe for large glulam beams though it applies also to sawn lumber, according to my Donald Breyer book p 6.18.

RE: Slenderness - Wood - Bending

(OP)
Thanks Boo and UCF...

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