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A 16" wide singly reinforced concrete beam for positive moment reinforcement contains how many reinforcements?

A) 5
B) 7
C) 9
D) 11

Answer :

Final answer:

A 16" wide singly reinforced concrete beam for positive moment reinforcement contains 4 reinforcement bars. None of the options are correct.

Explanation:

A singly reinforced concrete beam is a type of beam that contains only one layer of reinforcement, typically steel bars, on the tension side of the beam. In the case of a 16" wide beam for positive moment reinforcement, the number of reinforcements can be determined using the spacing requirement for the bars.

According to design codes and standards, the maximum spacing between the reinforcement bars should not exceed a certain value, typically a fraction of the beam depth. Let's assume the beam depth is 24" for this example.

If the maximum spacing between bars is set at 4", then the number of reinforcements in the beam can be calculated as follows:

  1. Calculate the effective width of the beam by subtracting twice the cover thickness from the total width. Assuming a cover thickness of 2", the effective width would be 16" - 2" - 2" = 12".
  2. Divide the effective width by the maximum spacing between bars to get the number of reinforcement bars: 12" / 4" = 3.
  3. Add the reinforcement bar in the middle of the beam, resulting in a total of 4 reinforcement bars.

Therefore, the answer to the question is B) 4 reinforcement bars.

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