Anchorage Length: Basic vs Equivalent

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In summary, the conversation discusses the difference between basic and equivalent anchorage length for reinforced concrete. Basic anchorage length is measured for the entire bend, while equivalent anchorage length is only measured from one side. The bent portion of the steel reinforcement is not considered to resist tension and is only provided to prevent slipping. A diagram is provided as an example.
  • #1
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Homework Statement


Guys , what is the difference between the basic and equivalent anchorage length ?
For the basic anchorage length , it is measured for the whole bend as in the figure a ..
For the b , for the equivalent anchorage length , why it's measured from one side only ? ( longer side)
https://calculocivil.com/eu/ec2/anchorage/base

Homework Equations

The Attempt at a Solution


I think for figure b , it's wrong ... It 's shold be measured for the whole L shape bend like figure a . Correct me if i am wrong . Thanks .
 

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Maybe tight bends, beyond 90° place the hook part of the bar in compression, not tension.
Refer to; 8.4.1
(3) Bends and hooks do not contribute to compression anchorages.
 
  • #3
Equivalent anchorage length is the length of the steel reinforcement that will be engaged through tensile strains in reinforced concrete.

Basic anchorage length is the equivalent anchorage length + the bent portion of the steel. The bent portion of the steel is not considered to resist any tensile strains/stresses and is simply provided to prevent the steel bars from slipping out of the reinforced concrete.
 
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  • #4
CivilSigma said:
Equivalent anchorage length is the length of the steel reinforcement that will be engaged through tensile strains in reinforced concrete.

Basic anchorage length is the equivalent anchorage length + the bent portion of the steel. The bent portion of the steel is not considered to resist any tensile strains/stresses and is simply provided to prevent the steel bars from slipping out of the reinforced concrete.
thanks , do you have any diagram as example ?
 
  • #5

1. What is anchorage length and why is it important?

Anchorage length refers to the length of reinforcement bars that is embedded in concrete to transfer tensile forces between the two materials. It is important because it ensures the stability and strength of the structure, preventing the reinforcement bars from slipping out of the concrete.

2. What is the difference between basic and equivalent anchorage length?

The basic anchorage length is calculated based on the diameter of the reinforcement bar and the strength of the concrete, while the equivalent anchorage length takes into account other factors such as the shape of the bar and the bond strength between the bar and the concrete. The equivalent length is usually longer than the basic length, providing a more conservative estimate for the required anchorage length.

3. How is anchorage length determined?

Anchorage length is determined by various factors including the diameter of the reinforcement bar, the type of reinforcement, the strength of the concrete, and the design load of the structure. It can be calculated using equations from building codes or determined through experimental testing.

4. Can the anchorage length be reduced?

In some cases, the required anchorage length can be reduced by using special reinforcement techniques such as hooks, bends, or mechanical anchors. However, these methods should only be used after careful consideration and approval from a structural engineer.

5. How can I ensure proper anchorage length in my structure?

Proper anchorage length can be ensured by following the building codes and design guidelines set by structural engineering organizations. It is also important to use high-quality reinforcement bars and concrete with appropriate strength and proper installation techniques. Regular inspection and testing can also help ensure the adequacy of the anchorage length in a structure.

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