I'm trying to determine the reasoning behind why we're required to hook the horizontal bars around the vertical bars in special reinforced shear walls. I've seen this requirement both in ACI 318 and ACI 530 (concrete and cmu) although ACI 318 only requires it if your design shear in the wall is greater than the Acv*lambda*sqrt(fc) and you don't have boundary elements. I'm asking because I have a cmu building in California under construction and the Contractor didn't measure correctly. When he poured the foundation he placed the vertical dowels too close to the inside edge of the cmu block and he can't get the horizontal hook around it. I'm trying to determine a fix and would like to know the reasoning behind the hook to decide on the best solution. Thanks for the help.
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