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Though the effective depth of a T-beam is the distance between the top compression edge to the centre of the tensile reinforcement, for heavy loads it is taken as:
  • a)
     
    1/8 of the span
  • b)
    1/16 of the span
  • c)
    1/12 of the span
  • d)
    1/24 of the span
Correct answer is option 'C'. Can you explain this answer?
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Effective Depth of T-Beam

The effective depth of a T-beam is the distance between the top compression edge to the centre of the tensile reinforcement. However, for heavy loads, it is taken as:

1/12 of the span

This is because for heavy loads, the T-beam needs to be designed to resist the bending moment effectively. A deeper beam will have a higher moment of resistance, and hence, a lower stress level. Thus, a deeper beam will be able to withstand higher loads without failure.

Factors Affecting Effective Depth

Some of the factors that affect the effective depth of a T-beam are:

1. Span of the Beam: The span of the beam is the distance between the supports. A longer span will require a deeper beam as it needs to resist a higher bending moment.

2. Load on the Beam: The load on the beam is another factor that affects the effective depth. A heavier load will require a deeper beam as it needs to resist a higher bending moment.

3. Type of Reinforcement: The type of reinforcement used in the beam is also a factor that affects the effective depth. A higher grade of reinforcement will allow for a shallower beam as it can withstand higher stresses.

Conclusion

In conclusion, the effective depth of a T-beam is an important factor in its design. For heavy loads, it is taken as 1/12 of the span as a deeper beam will have a higher moment of resistance and will be able to withstand higher loads without failure. The span of the beam, load on the beam, and type of reinforcement used are some of the factors that affect the effective depth of a T-beam.
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