How to measure amount of twist
How to measure amount of twist
(OP)
A flange of steel column is twisted- please see attached
Any particular tools or a way to calculate amount that is twisted?
Thank you
Any particular tools or a way to calculate amount that is twisted?
Thank you






RE: How to measure amount of twist
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: How to measure amount of twist
Thank you for your idea, could you please draw a sketch show where I place the square?
The column is a long column.
I appreciate it if you can explain on sketch where exactly I place the square.
Thank you
RE: How to measure amount of twist
RE: How to measure amount of twist
If the opposing flange is still straight, you could measure to that and subtract it from the known beam depth to work out the flange tip displacement.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: How to measure amount of twist
I assume that this twist or deformation is over some finite height of the col., and that the top and bot. of the col. are still in pretty good shape and in alignment. Clamp a bar to the outside of the flange at the top and bot., it should be a few inches longer than the flg. width. Then clamp pieces of piano wire btwn. the bars t&b and on their inside. Place the wires 1/8 or 1/4" out beyond the good flg. tips., so you are not touching the flg. tips anyplace. Now, you should be able to measure from the wire to the actual flg. tip in either x or y directions and at reasonable height increments over the deformation height. If the web is in pretty good shape, buy an inexpensive stl. square (but accurately square) and cut one leg short enough to fit btwn. the flg./web fillets. At the square corner of the square, cut a 45̊ clip off the square big enough to fit over the fillet radius. Place the short leg on the web and the long leg on the wire, and you should be able to measure the shape of the flg. deformation at any height interval. I think this is essentially what KootK was talking about.
RE: How to measure amount of twist
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: How to measure amount of twist
Jim
RE: How to measure amount of twist
Appreciate it very much