I am working on an existing building constructed in mid-late 1960's and came across this 5" thick INTERNAL slab PT detail:
The "11MSP" refer to 11 x 1/4" dia wires, with "M" denoting mastic/paper wrapped tendons, the "S" refer to standard button-head live-end, and the "P" is the standard button-head plate anchorage as a dead-end.
Anyway, what is unique, is how they detailed the end anchorages, 'kinked' down into the orthogonal beams, with access for stressing from the L or R side face of the beams (alternating stressing ends).
The eccentricities/CGS are 1/2" over the beams, and 3/4" midspan. Span is only 20'. Seems that a thicker RC slab would have been more economic.
I guess materials were expensive relative to labor, back in the day!
The "11MSP" refer to 11 x 1/4" dia wires, with "M" denoting mastic/paper wrapped tendons, the "S" refer to standard button-head live-end, and the "P" is the standard button-head plate anchorage as a dead-end.
Anyway, what is unique, is how they detailed the end anchorages, 'kinked' down into the orthogonal beams, with access for stressing from the L or R side face of the beams (alternating stressing ends).
The eccentricities/CGS are 1/2" over the beams, and 3/4" midspan. Span is only 20'. Seems that a thicker RC slab would have been more economic.
I guess materials were expensive relative to labor, back in the day!
