Cracking for Torsion

Question

Cracking for Torsion

dcarr82775 (Structural)

(OP)

21 Jul 14 12:20

I know there is a general Ig modifier for concrete beams. Is there a way to tell RISA the section cracked for torsion? I tried adjusting Ig, but I didn't see a significant change in the member torsions.

JoshPlumSE (Structural) · Answer 1 · 2014-07-21 13:06:51

The Icracked factors affect flexure, not torsion. RISA doesn't give you a direct way to manipulate the torsional stiffness of concrete members.

That being said, what about just modifying the G value for the concrete material? This will affect shear stiffness as well, so there could be some additional affect on your structure. But, shear stiffness may be a small contributor compared with the flexural stiffness of the member.

Also, if this reduction only applies to certain members, you can create a new concrete material and only assign it to these members.

dcarr82775 (Structural) · Answer 2 · 2014-07-21 14:52:29

Good idea. It worked well enough. Thanks

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Cracking for Torsion