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Structural column strength chart

Structural column strength chart

Structural column strength chart

(OP)

Is this chart available anywhere for different wall thicknesses and sections.
 
http://www.rotaryeng.net/bucktube.gif

If it available in a book I will buy the book.

RE: Structural column strength chart

That chart looks like Johnson buckling curves.  These Johnson buckling charts are based on crippling strength and column length.  Where did your chart come from?

RE: Structural column strength chart

johnson introduced a parabolic cut-off to the euler column curve ... these curves look a little more simplistic.

bruhn (probably niu too) has a complete section on column allowables, and how to generate them (it's not that hard)

RE: Structural column strength chart

looks like a 68ksi (fcy) steel ? (reverse calc'ing the Euler curve)

why would the welded section be twice as effective as non-welded ? ... heat-affected zone increasing the allowable ?, but wouldn't this benefit be localised to the weldment ?

i'll assume you know the euler equation.

the johnson curve, for short columns, is a parabola with a max. strength of fcy, and tangent to euler at 1/2*fcy

RE: Structural column strength chart

That chart is from Bruhn.  Page C4.7.  I wrote a FAQ on how to purchase a copy (see the Aircraft Forum).

There are "C" factors (end fixity) missing from the .GIF file you have.

Steven Fahey, CET

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