How does ideCAD define standard hooks, seismic hooks, crossties, and minimum inside bend Diameters according to ACI 318-19?
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Symbols
db = nominal diameter of bar, wire, or prestressing strand, in
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Seismic hooks used to anchor stirrups, ties, hoops, and crossties are in according to 25.3.4(a)
Minimum bend of 90 degrees for circular hoops and 135 degrees for all other hoops
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Hook
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engages longitudinal reinforcement, and the extension projects into the interior of the stirrup or hoop
Crossties
According to 25.3.5(a)
Crosstie is continuous between ends
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There is a seismic hook at one end
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There is a standard hook at the other end with a minimum bend of 90 degrees
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Hooks engage peripheral longitudinal bars
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90-degree hooks of two successive crossties engaging the same longitudinal bars are alternated end for end unless crossties satisfy 18.6.4.3 or 25.7.1.6.1
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