The effective depth of a doubly reinforced beam is the:

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  1. distance between the centroid of tension steel and the centroid of compression steel
  2. distance between the centroid of tension steel and the compression face of the beam 
  3. distance between the tension face of the beam and the compression face of the beam
  4. distance between the centroid of compression steel and the tension face of the beam

Answer (Detailed Solution Below)

Option 2 : distance between the centroid of tension steel and the compression face of the beam 
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Explanation:

Effective Depth:

  • In the design and analysis of reinforced concrete beams, the effective depth (d) is a critical parameter.
  • This effective depth is conventionally defined as the distance from the compression face of the beam (generally the top face in bending) to the centroid of the tension reinforcement (the steel rebar typically located near the bottom of the beam).
  • This is an important measure because it defines the 'lever arm' in the internal couple that resists applied bending moment, as per the theory of reinforced concrete design, the effective depth is a crucial factor affecting the strength and ductility of the beam.
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