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10 Questions

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Design of Concrete Members For Torsion

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Questions and Answers

What is the reason for limiting the size of a cross-section in structural design?

To improve aesthetic appearance only

To prevent crushing of the surface concrete due to inclined compressive stresses (correct)

To enhance ductility of the structure

To reduce material costs

When is it permissible to take the angle (θ) equal to 45 degrees?

For prestressed members

When dealing with excessive torsional forces

For non-prestressed members (correct)

When reinforcement spacing exceeds a certain limit

What is the minimum area of transverse closed stirrups required for torsional reinforcement?

$0.062ywfbs$

$0.35ywfs$

$0.062ywfb$ (correct)

$0.35ywfb$

How should the longitudinal reinforcement required for torsion be distributed around the perimeter of the closed stirrups?

With a maximum spacing of 300 mm Signup and view all the answers

In what position should the longitudinal bars or tendons be placed relative to the stirrups?

Inside the stirrups Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

How is cracking assumed to occur in a reinforced concrete beam under torsion?

When principal tensile stress reaches a specific value Signup and view all the answers

What does the principal tensile stress equal in a non-prestressed beam loaded with torsion alone?

$\frac{T}{2Aot}$ Signup and view all the answers