Page 52 - Building Regulation and Design Guidelines - Structural (Grey Code)

SECTION: 3 GUIDELINES FOR PRE STRESSED CONCRETE WORKS (SLABS) SECTION: 3 GUIDELINES FOR PRE STRESSED CONCRETE WORKS (SLABS)

Design Considerations: Design Considerations: Reinforcement
grouted in
Can transfer internal diaphragm forces slab keyway
Will develop volume change restraint forces Can transfer internal diaphragm forces
that must be considered in design of Can be designed as structural integrity tie Reinforcement per
connections Topping if
required Horizontal shear in composite beam must be design
transfered Topping
Fabrication Considerations: Opposing slab joints must line up
Slab manufacturing system must allow bottom
weld anchors Fabrication Considerations:
Beam inserts must align with slab inserts
allowing fabrication tolerances Weld Plate Clean and simple for slabs
(alt. ends)
Bearing strip Erection Considerations: Dam
Erection Considerations: with cores Bearing strip
P.C. or C.I.P. beaded Beam may have to be shored until topping is
Connections can be completed by follow-up concrete stud anchors cured
crew beam
Access for welding may require ladders or Horizontal shear reinforcement may present P.C. or C.I.P.
safety hazard for erector concrete
Spacer may be required to make weld Core dams must be placed beam
Fig. 5.3.5
Fig. 5.3.7
Beam and slab inserts must align
Design Considerations: Reinforcement
grouted in Design Considerations: Plate as required
Can transfer internal diaphragm forces slab keyway by design with beaded
Can be designed as structural integrity tie Reinforcement per Can transfer diaphragm shear stud anchors
Horizontal shear from beam cap must be Concrete design Can provide lateral brace for beam or deformed bar
transferred Topping if
required
Opposing slab joints must line up Potential for negative moment in slabs Topping if
required
Fabrication Considerations:
Fabrication Considerations:
Clean and simple for slabs tolerance on sawcut ends, the insert should be
installed after slabs are cut to length
Dam Beam and slab inserts must align
Erection Considerations: cores Bearing strip with beaded
stud anchors Bearing strip
Beam may have to be shored until cap is
cured Erection Considerations:
Horizontal shear reinforcement may present P.C. or C.I.P.
safety hazard for erector concrete If required for lateral beam stability, welding
beam
Core dams must be placed may have to be completed as slabs are set
P.C. or C.I.P.
Fig. 5.3.6 concrete
beam
Fig. 5.3.8
Fig. (3.17c) Connections
Fig. (3.17d) Connections

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