ReverenceEng
Structural
- Feb 18, 2016
- 81
Greetings fellow weary travelers!
ACI 3-18 Table 25.3.1 shows the standard hook geometry for development. The next page has Table 25.3.1 shows the standard hook geometry for stirrups, ties, and hoops.
So the question is, what about dowels that are transmitting shear and do not require development?
As an example... through the lens of a typical raised foundation for a 1-3 story residential SFR, most continuous foundations under the stem wall are 15" or 18" wide as shown in the residential code. However, the residential code simply calls out "dowels with standard hooks at the bottom" (paraphrasing). If you use development standard hooks, the geometry doesn't work as the hook extends far into the clear cover. It seems that they must be using minimum standard hooks from 25.3.2, but it doesn't seem to say this (or does it?). Alternatively, is it stated somewhere or simply accepted as practice that hooked dowels that do not need to develop can just have the minimum hook per 25.3.2? Are dowels covered by the statement in 25.3.2 where it says "Minimum inside bend diameters for bars used as transverse reinforcement and standard hooks for bars..." by considering them "transverse reinforcement"?
If so, how does one clarify this on the plans so the contractor knows to use the minimum hooks in these cases...but not...let's say...at the bottom of a retaining wall where you actually do need the development?
ACI 3-18 Table 25.3.1 shows the standard hook geometry for development. The next page has Table 25.3.1 shows the standard hook geometry for stirrups, ties, and hoops.
So the question is, what about dowels that are transmitting shear and do not require development?
As an example... through the lens of a typical raised foundation for a 1-3 story residential SFR, most continuous foundations under the stem wall are 15" or 18" wide as shown in the residential code. However, the residential code simply calls out "dowels with standard hooks at the bottom" (paraphrasing). If you use development standard hooks, the geometry doesn't work as the hook extends far into the clear cover. It seems that they must be using minimum standard hooks from 25.3.2, but it doesn't seem to say this (or does it?). Alternatively, is it stated somewhere or simply accepted as practice that hooked dowels that do not need to develop can just have the minimum hook per 25.3.2? Are dowels covered by the statement in 25.3.2 where it says "Minimum inside bend diameters for bars used as transverse reinforcement and standard hooks for bars..." by considering them "transverse reinforcement"?
If so, how does one clarify this on the plans so the contractor knows to use the minimum hooks in these cases...but not...let's say...at the bottom of a retaining wall where you actually do need the development?
