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Q: The following statements (S1, S2, S3) pertain to an under reinforces beam of concrete. S1 These beams are deeper when compared to a balanced beam section S2 The failure of the beam takes place due to failure of steel S3 These beams undergo large deflections at failure Choose the correct statements.
  • A. S1 and S2
  • B. S2 and S3
  • C. S1 and S3
  • D. S1, S2 and S3
Correct Answer: Option D - Under Reinforced Beam In an under reinforced section, the percentage of steel provided is less than that provided in balaced section. So, the actual neutral axis will shift upwards • In under reinforce section the stress in steel first reaches it permissible value, while the concrete is under stressed. • The failure is ductile because steel fails first and sufficient warning is given before collapse. Due to ductile failure and economy the under reinforced section are preferred by designers.
D. Under Reinforced Beam In an under reinforced section, the percentage of steel provided is less than that provided in balaced section. So, the actual neutral axis will shift upwards • In under reinforce section the stress in steel first reaches it permissible value, while the concrete is under stressed. • The failure is ductile because steel fails first and sufficient warning is given before collapse. Due to ductile failure and economy the under reinforced section are preferred by designers.

Explanations:

Under Reinforced Beam In an under reinforced section, the percentage of steel provided is less than that provided in balaced section. So, the actual neutral axis will shift upwards • In under reinforce section the stress in steel first reaches it permissible value, while the concrete is under stressed. • The failure is ductile because steel fails first and sufficient warning is given before collapse. Due to ductile failure and economy the under reinforced section are preferred by designers.