Design for Torsion in Reinforced Concrete Beams

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In the context of torsion design, how is a beam idealized according to the text?

As a thin-walled tube with the core concrete cross section neglected.

After cracking in torsion, what primarily provides the torsional resistance in a reinforced concrete beam?

Closed stirrups and longitudinal bars near the surface.

What part of the cross section is assumed to provide resistance in the thin-walled tube analogy for torsion design?

Outer skin of the cross section roughly centered on closed stirrups.

How are both hollow and solid sections idealized in torsion design according to the text?

Both are idealized as thin-walled tubes before and after cracking.

What provides the primary torsional resistance in the thin-walled tube analogy for both hollow and solid sections?

Outer skin of the cross section centered on closed stirrups.

In torsion design, the idealization of a beam as a thin-walled tube is based on which analogy?

Space frame analogy

When a reinforced concrete beam has cracked in torsion, where is the primary source of torsional resistance located according to the thin-walled tube analogy?

Outer skin of the cross section near closed stirrups

How are hollow and solid sections typically idealized in torsion design according to the text?

As thin-walled tubes with resistance from closed stirrups

Which component is neglected in the thin-walled tube analogy for torsion design?

Core concrete cross section

After cracking in torsion, what primarily contributes to the torsional resistance in a reinforced concrete beam?

Closed stirrups and longitudinal bars near the surface

Learn about the design approach for torsion in reinforced concrete beams, based on a thin-walled tube and space truss analogy. Discover how the torsional resistance is primarily provided by closed stirrups and longitudinal bars near the surface of the member.

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