The maximum area of tension reinforcement in beams shall not exceed ____ of the total area.
Show Hint
- \( 0.15\% \)
- \( 1.5\% \)
- \( 4\% \)
- \( 1\% \)
The Correct Option is C
Solution and Explanation
As per IS 456:2000 (Clause 26.5.1.1), the maximum area of tension reinforcement in beams shall not exceed:
\[ A_{st,max} = 0.04 \times b \times D \] where \( b \) is the breadth and \( D \) is the overall depth of the beam.
Step 2: Interpreting this in percentage terms.
This value corresponds to: \[ \frac{A_{st,max}}{bD} \times 100 = \frac{0.04bD}{bD} \times 100 = 4% \]
Top Questions on Concrete
Consider the beam section shown in the figure, with \( y \) indicating the depth of neutral axis (NA). The section is only subjected to an increasing bending moment. It is given that \( y = 18.75 \, {mm} \), when the section has not yielded at the top and bottom fibres. Further, \( y \) decreases to 5 mm, when the entire section has yielded. The shape factor of the section is ........ (rounded off to 2 decimal places).
- Consider a reinforced concrete beam section of 300 mm width and 700 mm depth. The beam is reinforced with the tension steel of 2000 mm² area at an effective cover of 50 mm. Concrete in the tension zone is assumed to be cracked. Assume the modular ratio of 12 and Young's modulus of 200 GPa for steel. When the extreme fibre in the compression zone undergoes the strain of 0.0004 due to the applied bending moment, the stress in the steel (in MPa) is ..... (rounded off to the nearest integer).
- Identify the FALSE statement from the following options:
Consider a reinforced concrete beam section of 350 mm width and 600 mm depth. The beam is reinforced with the tension steel of 800 mm\(^2\) area at an effective cover of 40 mm. Consider M20 concrete and Fe415 steel. Let the stress block considered for concrete in IS 456:2000 be replaced by an equivalent rectangular stress block, with no change in (a) the area of the stress block, (b) the design strength of concrete (at the strain of 0.0035), and (c) the location of neutral axis at flexural collapse.
The ultimate moment of resistance of the beam (in kN.m) is ___________ (round off to the nearest integer).
- The minimum headroom over a stair must be
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