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STRESSCRETE SHELL BEAMS
Stresscrete Shell beams are an innovative answer to one of
the oldest problems - how to speed up and simplify floor
construction without compromising effective engineering and
building practice. Stresscrete Shell beams can be used in
ductile moment resisting frames. They offer many advantages in
building construction:
- Midspan propping can be eliminated to reduce dead load
continuity moments and reinforcing steel congestion at beam
to column joints.
- Less skilled labour is required on site.
- Factory production ensures dimensional accuracy and a
specified surface finish.
- Delivery can be guaranteed to a mutually agreed
schedule.
- Precast units can be speedily erected and provide a
tidy, uncluttered and safe working area.
- Units are maintenance free and fire resistant.
SECTION CAPACITY TABLES
The capacities in the following two tables are pretensioned
strand capacities only. Additional strength can be provided by
providing untensioned reinforcement positioned in the Shell Beam
infill concrete.
|
U-BEAM SECTION (PRECAST
UNIT ONLY) |
| This table
gives the cracking moment and vertical shear
capacities for individual simply supported
Shell Beams, unproppped at midspan. |
| Precast
Section |
400d x 400b |
400d x 600b
|
o/a depth |
600d x 400b |
600d x 600b
|
o/a depth |
| Cracking moment (kNm) |
123 |
156 |
400mm |
225 |
292 |
600mm |
|
Ultimate shear
(kN) |
210 |
210 |
400mm
|
330 |
330 |
600mm |
|
|
T-BEAM SECTION (COMPOSITE SECTION) |
|
This table gives the positive moment
Ultimate capacities for individual simply
supported Shell Beams, unproppped at midspan.
The capacities are based on a flange
overhang of (8 x slab thickness) & 65mm
concrete topping (NZS 3101: Part 1: 1995
4.3.3.7 a. (i)). |
|
Composite section ultimate resisting moments
(kNm) |
400d x 400b |
400d x 600b
|
o/a depth |
600d x 400b |
600d x 600b |
o/a depth |
| 50mm flange supported
Double Tee |
341 |
448 |
515mm |
509 |
672 |
715mm |
| 75mm
Unispan |
362 |
476 |
540mm |
530 |
700
|
740mm |
| 200mm
Hollowcore |
467 |
616 |
665mm |
635 |
840 |
865mm |
| 300mm
Hollowcore |
551 |
728 |
765mm |
719 |
952 |
965mm |
| 400mm
Hollowcore |
635 |
840 |
865mm |
803 |
1064 |
1065mm |
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