The 'torsion' in RC beams is resisted by:
Choose the correct answer
Only longitudinal bars (no stirrups needed)
Closed stirrups (links) + longitudinal bars at corners — space truss analogy; open stirrups cannot resist torsion
Pre-stressing force only
Only concrete in pure compression
Correct Answer
B. Closed stirrups (links) + longitudinal bars at corners — space truss analogy; open stirrups cannot resist torsion
Why is this the answer?
IS 456 Cl. 41: torsion resistance by closed stirrups (links around all bars, no open stirrups for torsion) + longitudinal bars at corners. Space truss analogy: concrete diagonal compressive struts + longitudinal tension + transverse tension in ties. Torsion equivalent shear Tve = (Tu + Tu') for design; longitudinal steel Asl = Tve/(2A_oh×fy/γs). Closed stirrups critical — open stirrups cannot resist torsion.
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