10 Questions
What is the reason for limiting the size of a cross-section in structural design?
To prevent crushing of the surface concrete due to inclined compressive stresses
When is it permissible to take the angle (θ) equal to 45 degrees?
For non-prestressed members
What is the minimum area of transverse closed stirrups required for torsional reinforcement?
$0.062ywfb$
How should the longitudinal reinforcement required for torsion be distributed around the perimeter of the closed stirrups?
With a maximum spacing of 300 mm
In what position should the longitudinal bars or tendons be placed relative to the stirrups?
Inside the stirrups
In the design for torsion of reinforced concrete beams, the torsional resistance is primarily provided by which components?
Closed stirrups and longitudinal bars near the surface
What is the significance of a torque that does not exceed one-quarter of the cracking torque in a reinforced concrete beam subjected to torsion?
It can be ignored as it does not reduce the flexural or shear strength significantly
What happens to the cracking torsion in a reinforced concrete beam under pure torsion?
It is derived by considering an equivalent thin-walled tube before cracking
How is cracking assumed to occur in a reinforced concrete beam under torsion?
When principal tensile stress reaches a specific value
What does the principal tensile stress equal in a non-prestressed beam loaded with torsion alone?
$\frac{T}{2Aot}$
Learn about the design approach for concrete members subjected to torsion, based on a thin-walled tube and space truss analogy. Understand how the torsional resistance in reinforced concrete beams is primarily provided by stirrups and longitudinal bars.
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