Reinforcing bar development length criteria vary according to the depth of concrete cast below the bar. Where greater than twelve inches of concrete lies below the bar, a development length of ld1,high is required. Where twelve inches or less of concrete lies below the bar, a reduced development length of ld1 applies.
l d1,high l d1 > 12" CONCRETE BELOW BAR WHERE NOTED ON PLAN OR DETAILS PROVIDE APPLICABLE LENGTH PER CONDITIONS BELOW l d ≤ 12" CONCRETE BELOW BAR 3
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