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Q: Select the correct statement while designing a singly reinforced beam in the limit state method.
  • A. Under reinforced beams have minimum cross section area.
  • B. Under reinforced beams have brittle failure.
  • C. A designer may have multiple solutions.
  • D. Only over reinforced beams are designed.
Correct Answer: Option C - The following important rules/solutions must be kept in mind for designing a singly reinforced beam– 1. Effective span 2. Control of deflection 3. Slenderness limits for beams to ensure lateral stability 4. Critical section for moment and shear 5. Reinforcement in beam 6. Curtailment of tension reinforcement in flexural member 7. Development length requirements at supports 8. Spacing of reinforcement 9. Nominal cover to reinforcement 10. Anchoring reinforcing bars 11. Moment and shear coefficients for continuous beams and slabs 12. Unit weight of concretes etc. Note–Under reinforced beam have ductile failure. • Over reinforced beam have brittle failure.
C. The following important rules/solutions must be kept in mind for designing a singly reinforced beam– 1. Effective span 2. Control of deflection 3. Slenderness limits for beams to ensure lateral stability 4. Critical section for moment and shear 5. Reinforcement in beam 6. Curtailment of tension reinforcement in flexural member 7. Development length requirements at supports 8. Spacing of reinforcement 9. Nominal cover to reinforcement 10. Anchoring reinforcing bars 11. Moment and shear coefficients for continuous beams and slabs 12. Unit weight of concretes etc. Note–Under reinforced beam have ductile failure. • Over reinforced beam have brittle failure.

Explanations:

The following important rules/solutions must be kept in mind for designing a singly reinforced beam– 1. Effective span 2. Control of deflection 3. Slenderness limits for beams to ensure lateral stability 4. Critical section for moment and shear 5. Reinforcement in beam 6. Curtailment of tension reinforcement in flexural member 7. Development length requirements at supports 8. Spacing of reinforcement 9. Nominal cover to reinforcement 10. Anchoring reinforcing bars 11. Moment and shear coefficients for continuous beams and slabs 12. Unit weight of concretes etc. Note–Under reinforced beam have ductile failure. • Over reinforced beam have brittle failure.