At cold joints between columns or walls and footings

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At cold joints between columns or walls and footings (especially for systems resisting lateral forces ) , ACI code requires to check horizontal force transfer !

At design stage , we are assuming monolithic concrete but in reality cold joints will occur .

Cold joints may reduce shear capacity for concrete section , so ACI code requires simple check using shear friction provisions in section 22.9.4.2 (ACI318-19) .

We are calculating the required area of steel by the strength load combinations and required area of steel using shear friction reinforcement then we shall provide the larger one .

This concept also can be used to check Wall-Slab connection in a buildings when using Jump System Formwork where we are casting the walls first then casting floors will be later on .

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