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If the bond stress developed in a reinforced concrete beam is more than permissible value, it can be brought down by
- a)Decreasing the depth of the beam
- b)Decreasing the number of bars
- c)Decreasing the diameter of the bars
- d)Increasing the diameter of the bars
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
If the bond stress developed in a reinforced concrete beam is more tha...
Explanation:
Bond stress is the stress developed between the concrete and the reinforcing steel bars. If the bond stress developed in a reinforced concrete beam is more than the permissible value, it can lead to the failure of the beam. Therefore, it is necessary to bring down the bond stress to a safe level. This can be achieved by decreasing the diameter of the bars.
Reasons why decreasing the diameter of the bars is effective:
- Decreasing the diameter of the bars reduces the surface area of the bars in contact with the concrete, which in turn reduces the bond stress developed between the two materials.
- The bond stress is directly proportional to the diameter of the bars. Hence, decreasing the diameter of the bars reduces the bond stress.
- This method is more effective than decreasing the depth of the beam or decreasing the number of bars, as it does not compromise the strength and stability of the beam.
Steps to decrease the diameter of the bars:
- Identify the bars that are causing the high bond stress.
- Determine the maximum permissible bond stress for the specific concrete mix being used.
- Calculate the reduction in diameter required to bring the bond stress down to the permissible level.
- Replace the existing bars with bars of the reduced diameter.
Note: It is important to ensure that the reduction in diameter does not compromise the required strength and stability of the beam. Also, the reduction in diameter should be done in accordance with the design specifications and codes.
Bond stress is the stress developed between the concrete and the reinforcing steel bars. If the bond stress developed in a reinforced concrete beam is more than the permissible value, it can lead to the failure of the beam. Therefore, it is necessary to bring down the bond stress to a safe level. This can be achieved by decreasing the diameter of the bars.
Reasons why decreasing the diameter of the bars is effective:
- Decreasing the diameter of the bars reduces the surface area of the bars in contact with the concrete, which in turn reduces the bond stress developed between the two materials.
- The bond stress is directly proportional to the diameter of the bars. Hence, decreasing the diameter of the bars reduces the bond stress.
- This method is more effective than decreasing the depth of the beam or decreasing the number of bars, as it does not compromise the strength and stability of the beam.
Steps to decrease the diameter of the bars:
- Identify the bars that are causing the high bond stress.
- Determine the maximum permissible bond stress for the specific concrete mix being used.
- Calculate the reduction in diameter required to bring the bond stress down to the permissible level.
- Replace the existing bars with bars of the reduced diameter.
Note: It is important to ensure that the reduction in diameter does not compromise the required strength and stability of the beam. Also, the reduction in diameter should be done in accordance with the design specifications and codes.
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Community Answer
If the bond stress developed in a reinforced concrete beam is more tha...
Bond stress:
- When the steel bars are embedded in concrete, the concrete after setting, adheres to the surface of the bars and thus resist any force that tends to pull or push this rod. The intensity of this adhesive force is called bond stress.
- It is the longitudinal shear stress acting on the surface between the steel and concrete. The term bond is used to describe the means by which slip between the steel and concrete is prevented.
- The bond is provided by anchoring the bars properly and extending the bars beyond the point of maximum shear.
Explanation:
If the bond stress developed in a reinforced concrete beam is more than the permissible value, then it can be brought down by,
If the bond stress developed in a reinforced concrete beam is more than the permissible value, then it can be brought down by,
- Increasing the depth of beam
- Decreasing the diameter of the bar
- Increasing the number of bars
Additional Information
The permissible bond stress for the different grades of concrete are tabulated below:
As per IS 456: 2000, Clause 26.2.1.1,
In limit state method of design, the design bond strength for plain bars in tension are given below in the table:
Note:
The permissible bond stress for the different grades of concrete are tabulated below:
As per IS 456: 2000, Clause 26.2.1.1,
In limit state method of design, the design bond strength for plain bars in tension are given below in the table:
Note:
- The above value bond stress is for the plain bar in tension.
- The value of bond stress is increased by 60 % when deformed bars are used.
- The value of bond stress is increased by 25 % when the bar is in compression.
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If the bond stress developed in a reinforced concrete beam is more than permissible value, it can be brought down bya)Decreasing the depth of the beamb)Decreasing the number of barsc)Decreasing the diameter of the barsd)Increasing the diameter of the barsCorrect answer is option 'C'. Can you explain this answer?
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