Moment of resistance of a ‘T' beam is greater due to large

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WBMSC Sub-Assistant Engineer (Civil) 05 Jun 2022 Official Paper
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  1. amount of tensile steel. 
  2. amount of compression steel. 
  3. compressive area of flange. 
  4. None of these 

Answer (Detailed Solution Below)

Option 3 : compressive area of flange. 
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Detailed Solution

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Explanation:

T-Beam:

  • In RCC construction, slabs and beams are cast monolithic-ally. In such construction, a portion of the slab act integrally with the beam and bends along with the beam under the loads.
  • The flange of the beam (part of the slab) contributes in resisting compression by adding more area of concrete in compression zone. This results in increasing moment of resistance of the beam section.

Additional Information

Effective Width of Flange

Monolithic Beams

T – Beams

\({b_f} = {b_w} + \frac{{{l_o}}}{6} + 6{d_f}\)

L – Beams

\({b_f} = {b_w} + 0.5\left( {\frac{{{l_o}}}{6} + 6{d_f}} \right)\)

Isolated Beams

T – Beams

\({b_f} = {b_w} + \frac{{{l_o}}}{{\frac{{{l_o}}}{b} + 4}}\)

L – Beams

\({b_f} = {b_w} + \frac{{0.5 \times {l_o}}}{{\frac{{{l_o}}}{b} + 4}}\)

Where

bf = effective width of flange

lo = distance between points of zero moments in the beam

bw = breadth of the web

df = thickness of the flange

b = actual width of the flange

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