column starter bars
column starter bars
(OP)
In a reinforced concrete buildings project, the contractor casted about 150 foundations with 6 ∅14mm starter bars for the columns, at a later stage it was found that the reinforcement in some columns has to increased to 6 ∅16mm, the first proposition was to add dowels by drilling and epoxy, then after consulting it was decided that the 6 ∅16mm can be just added to overlap with the 6 ∅14mm, I checked ACI 318 and ACI 315 and found nothing in regard??
Note : the foundations were designed as Fixed.
Note : the foundations were designed as Fixed.






RE: column starter bars
If they are then I don't see what good just lapping them with the 14 starters does.
RE: column starter bars
It may be that the 16mm bars were required for the column itself (compression-buckling criteria) and at the base, the moment into the footing is smaller such that the 14mm bars will work OK....
But you have to check the calculations and perhaps perform new calculations to know for sure.
RE: column starter bars
RE: column starter bars
http://www.aisc.org/content.aspx?id=2164
RE: column starter bars