Flashcards in Precast Concrete Deck (16)
precast beam shapes
usually rectangular, T-shaped, or L-shaped.
advantage of T and L shaped beams
floor flush w/ top of beam (min. total depth)
very efficient, widely used,
topping slab poured, cover joints and level floor.
single T and double T sections
typ. rec. shape w welding plates top+bottom.
cast w haunches (shoulders)
in addition to T-section as floor/roof,
simple reinforced slabs used.
Floor and Roof Panels
Floor and Roof Panels: solid slab =
light loads + short spans
Floor and Roof Panels: hollow, cored slab =
heavier load + longer span
increased depth, while min weight.
Floor and Roof Panels: hollow, cored slab can be up to this length
up to 36ft long
6-12” thick, 4’ wide
entire floor sections are cast on ground,
one on top of other,
around pre-erected columns.
bond breaker between successive pours.
lifted into place (jacks attached to columns)
connected to columns w weld plates.
typ min formwork and construction time.
Lift slab construction
Wall Panels typ. dims
typ 5-8” thick, long enough to span columns or beams.
$ savings @ wall panels
if panels span beams, > $ savings in multistory by panels spanning 2 floors.
can be cast horizontally right on floor slab using a bond breaker
sheet of plastic or liquid solution (better finish)
members have internal stresses applied before subject to service loads.
compressive forces where member would be in tension.
more efficient + economical section,
reduces cracking + deflection,
increases shear strength,
longer spans/ greater loads.
Precast, Prestressed Concrete
high-strength stranded cable/wire draped in forms, tensile force applied.
once cured, cables are cut,
compressive forces transferred to concrete through bond between cable/conc.