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PS CONCRETE: Torsion in Double-Tees

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Title: PS CONCRETE: Torsion in Double-Tees

I'm analyzing a 10DT32 (precast prestressed double-tee that is ten feet in width and 32 inches deep) roof beam. There is load on it from an equipment platform resting directly atop one of the stems.

"Theoretically" this can be viewed as an eccentrically-placed load with respect to the double-tee centroid. However, analyzing it in this way puts a torque into the beam that is unacceptably high.

But I can't help but view this as a loaded SINGLE-TEE beam half the width of the double tee, with the only needed check being the flexure induced in the continuous flange between the stems.

Any thoughts?



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