hook development length

huangyhg

hook development length
can someone explain to me 12.5.3 length ldh in 12.5.2 shall be permitted to be multiplied by the following factors.....  
i feel like i dont really understand 100% for factors a and b.
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a) for all hooks (180 or 90) the side cover must be at least 2.5 incheses.  
for 90 hooks, the cover behind the hook must be at least 2.5"
b)is pretty self explanatory.
these are related more for splitting type failures of the concrete as opposed to actual pull-out.
eit, explain behind the hook.  meaning the cover to the left of shape l?
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no, if you follow the bar from the middle of the   
ok, so if this hook is for the dowel at the base of a retaining wall going into the toe, then the minimum concrete cover is 3" because it is againts the earth (no form).  does this mean i can multiply this factor?
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yes
sweet...  i cant wait for you to take your pe buddy.  you will be a good one.
not almost anymore!  
i've got about 2.5 years to go!!