huangyhg

can you take torsion at distance dv from the face of the sup
i am curious if we can take torsion at distance dv from the supports like we can with shear? i have heard mixed feelings about this and was curious what aci but especially csa a.23 has to say about this.
also, if i have a cantilevered slab on top of a beam, this slab will introduce torsion into the beam. i was told to take the eccentricity from the center of the slab to the face of the beam as opposed to the center of the beam. i am not convinced at all but wanted some second thoughts on this.
clansman
check out our whitepaper library.
the critical section for torsional stress may be taken as dv away from the support, same as shear...because torsional stress is, in fact shear stress.
if a slab cantilevers from a beam with no back span, then torsion in the beam is wl^2/2 where l is the distance from the centroid of the beam to the end of the cantilever.
moment in the slab, however, may be measured to the face of support.
best regards,
ba
agree with baretired, the beam you have described is working in equilibrium torsion and torsion must be designed for. i would analyse the eccentricity to the centreline of the beam.
you are really getting into the r/c design questions today.

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