PCI Handbook - 48"wide DBT's
PCI Handbook - 48"wide DBT's
(OP)
I'm looking for span tables for 48" wide - 14" double tees. I've got all the PCI Handbooks dating back to the 3rd Edition (pub 1985) and none of them have 48" wide dbt's.
I'm doing some work to an existing roof, and the drawings are probably 70's-ish.
Would anybody with a PCI Handbook older than the 3rd Edition please look up the following:
48"wide x 14"deep dbltee w/ 27S strand pattern spanning 30'.
thanks
I'm doing some work to an existing roof, and the drawings are probably 70's-ish.
Would anybody with a PCI Handbook older than the 3rd Edition please look up the following:
48"wide x 14"deep dbltee w/ 27S strand pattern spanning 30'.
thanks






RE: PCI Handbook - 48"wide DBT's
My 2nd Edition PCA Handbook has no capacity for 30 ft. long double tees with a 27 strand pattern. For a 8'-0" wide double tee with 28 strands, the longest span is 26 ft. For that span the capacity is 33 psf. You could work backward and figure out the allowable based on that.
RE: PCI Handbook - 48"wide DBT's
RE: PCI Handbook - 48"wide DBT's
You don't indicate whether the double tee is topped or not, the actual geometry of the tee, whether it is lightweight or normal weight concrete, whether the strands were 270 ksi, 250 ksi, stress relieved or low relaxation strand. If it is 4' between legs then most likely it was cast in an 8' wide tee bed with the outer flanges blocked out. The 8' wide tees had the legs 4'-0"o.c., the 10' wide tee would have the legs 5'-0" apart.
That having been said, when I worked for a pre-cast manufacturer (back in the early 80's), we had our own design program and produced our own strand pattern designs which had no relationship at all to the patterns shown in the PCI book. We designed it and laid it out however we needed it and however it was required to be to fit the casting beds out in the casting yard. It's possible the nomenclature could be particular to a specific manufacturer and not as per the PCI nomenclature in the handbook.
You might be careful assuming that it is a PCI design. Just a thought.
RE: PCI Handbook - 48"wide DBT's
RE: PCI Handbook - 48"wide DBT's
let's assume normal weight concrete and untopped.
RE: PCI Handbook - 48"wide DBT's