The difference between cracked an uncracked concrete is defined in BS EN 1992-4. Several of the design verifications requireed for concrte anchorage design depend on whether the concrete is defined as cracked or uncracked. This is not a simple case of checking onsite whether the concrete member is cracked or not. The definition of cracked or uncracked concrete is explained below.
Difference Between Cracked and Uncracked Concrete
To define a concrete member as uncracked the designer must be able to demonstrate with stress analysis that the concrete in the vicinity of the anchor will remain uncracked throughout the design life of the member in all anticipated loading conditions.
This is typically only the case in members or parts of members which will not experience significant tensile forces. Some examples of areas which may remain uncracked are shown below.
Generally it is conservative to design the anchor for the cracked condition where there is any doubt or where a complex stress analysis would be required to prove the concrete will remain uncracked.
The CivilWeb Concrete Anchorage Design Spreadsheet completes all the required calculations for cracked or uncracked concrete.
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