I-beam torsional stress calculation
I-beam torsional stress calculation
(OP)
Can anyone tell me how to calulate torsional stress on an I-beam section? I have read texts that state that the shear stress of each individual section is based on the the sum of torsional resistances of each individual section of the beam. Is this the standard way of computing the shear stress (due to torsion) for non-circular members?
What is the torsional constant "J" as listed in the Torsion Properties table of the AISC Manual of Steel Construction. Is this value used in the stress calculation as described above?
Thanks in advance,
What is the torsional constant "J" as listed in the Torsion Properties table of the AISC Manual of Steel Construction. Is this value used in the stress calculation as described above?
Thanks in advance,





RE: I-beam torsional stress calculation
You'll see that there are two mechanisms which create torsional capacity for I beams. The pure torsional shear capacity is what you described above. A much larger component of capacity is created by torsional warping. This is when the top and bottom flanges have equal shear loads in opposite directions. This also causes tension and compression forces in the member.
These analyses are quite complicated. You might want to get someone who's done it before to guide you through it. Try posting on the "Structural Engineering-Other Topics" board.
RE: I-beam torsional stress calculation
RE: I-beam torsional stress calculation
RE: I-beam torsional stress calculation
yeah, old school. However our library has a search service to locate older books, etc. I had them chace down sereral books by Timoshenko, Treseige, Heneiti and a couple of booklets. I like to play around with "elastic foundation".
Some libraries may have access to some of the golden oldies and share. I've had books/etc loaded to our library from all over the US. Maybe, others can use this service to find some of the out of date data. I dont feel to bad about copying 40-60 year old data.
I've been putting the "Moments and Reactions for Rectangular Plates" by the Bureau of Reclamation I found on spreadsheets, my eyesight is getting to poor to tead the fine print. That was the best 55 cents I ever spent.
Best, Tincan, BSCE'63
RE: I-beam torsional stress calculation
Good Luck