End anchorage of bars is taken as the greater of d-a)Effective depth ...
End anchorage. A mechanical device used to transmit prestressing force to the reinforced concrete in a post-tensioned member.
Hence, the correct option is (A)
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End anchorage of bars is taken as the greater of d-a)Effective depth ...
The correct answer is option 'A' - the end anchorage of bars is taken as the greater of the effective depth or (d-a) times the diameter of the bar.
Explanation:
- The end anchorage of bars is an important aspect in the design of reinforced concrete structures. It refers to the length of bar required to develop its full strength at the ends of a member, such as a beam or a column.
- The effective depth of a reinforced concrete member is the distance from the extreme compression fiber to the centroid of the tension reinforcement.
- The effective depth is an important parameter in determining the end anchorage length because it affects the development length of the bars.
- The development length is the length of bar required to transfer the stress from the steel to the concrete without causing any slip or failure.
- The development length depends on factors such as the grade of steel, the grade of concrete, the diameter of the bar, and the bond strength between the steel and the concrete.
- The code of practice for reinforced concrete structures provides guidelines for determining the end anchorage length based on these factors.
- According to the code, the end anchorage length should be taken as the greater of the effective depth or (d-a) times the diameter of the bar.
- Here, 'd' represents the overall depth of the member, 'a' represents the cover to the reinforcement, and the diameter of the bar is denoted by 'd'.
- The factor (d-a) accounts for the distance between the extreme compression fiber and the centroid of the tension reinforcement, which is where the maximum bending moment occurs.
- By taking the greater value between the effective depth and (d-a) times the diameter of the bar, the code ensures that sufficient anchorage length is provided to prevent any failure or slip of the bars at the ends of the member.
- Option 'A' is the correct answer because it correctly represents the code requirement for determining the end anchorage length.