Table of Contents

Limiting Moment of Resistance of a RCC Beam

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The limiting Moment of Resistance of a RCC Beam is given as:

Mu,lim = 0.362Bfck Xu,lim (d-0.42 Xu,Lim)

Where symbols have their usual meaning

Further, the Xu,lim/d ratio depends on grade of steel being used, which is referred from the below table:

Grade of Steel

Xu,lim/d

Fe 250

0.53

Fe 400

0.48

Fe 500

0.46


Development Length of Steel bar in RCC

Development length:

(i) The calculated tension or compression in any bar at any section shall be developed on each side of the section by an appropriate development length or end anchorage or a combination thereof.

Ï• = Diameter of bar

Ï„bd = Design bond stress = Permissible value of average bond stress

The value of bond stress is increased by 60% for a deformed bar in tension and a further increase of 25% is made for bars in compression.

In case of bundled bars in contact the development length is increased than that for individual bar by

  1. 10% for two bars in contact
  2. 20% for three bars in contact
  3. 33% for four bars in content

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