huangyhg

% of reinforcement in column
we cast more than 50 pediestal dimenion 700mmx700mm
with reinformcment 12 bar diameter 16
the main problem we can not demoilish the pedital because
we fixed percast column and they fixed the beams and slab
what can i do?

hi, swelm
could you please more specific? i don´t now what is your problem/question. try to be more specific in tour post so we could help you
thanks
lg
are you saying that you have 50 columns that are about 27.5" x 27.5" with 12-#5 bars (converted to english units), which gives you a reinforcing ratio of approximately 0.5%? is that your question?
if i did the metric conversions correctly, it sounds like you have about 1/2% of longitundinal reinforcing in the piers. is this correct?
aci has a provision to go down to 1/2% if the piers are larger than they need to be to resist the forces. what is the governing code? does the pier, as reinforced, have enough capacity to resist the forces? do the longitudinal bars have sufficient ties?
iam very sorry because i make confuse for all of you
the columns is safe to carry the load but i notes that the % of reinforement is not enough less than 50%
we use aci for design
the columns have ties diamter 10 mm 3 set.
my question is
is that sutiation is critial and we need repair or not ?
thanks
1/2% is allowed if the strength is sufficient using 1/2 of ag. (thus 1% of the area required is 1/2% of ag).
if the concern is that you're actually under 0.5%, check your design (neglecting the steel) against the aci provisions for structural plain concrete (318-05 chp 22). if it works as spc, the fact that you actually have some reinforcement there is immaterial. if the question is whether 0.5% is acceptable, above answers are correct.
if the geometry of your pedestal matches the description of pedestal in aci-318, then you may not need any reinforcing at all.

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