Civil Engineering Reference
In-Depth Information
1.7.2
Building No. 2—5-Story Flat Plate Construction
(1)
Floor system: two-way flat plate - with spandrel beams for Alternate (1)
(2)
Lateral-force resisting system
Alternate (1)—slab and column framing-with spandrel beam
Alternate (2)—structural shearwalls
(3)
Load data: roof
LL = 20 psf
DL = 122 psf
floors
LL = 50 psf
DL* = 142 psf (9 in. slab)
136 psf (8.5 in. slab)
(4)
Preliminary sizing:
Slab (with spandrels) = 8.5 in.
Slab (without spandrels) = 9 in.
Columns interior = 16
16 in.
exterior = 12
12 in.
Spandrels = 12
20 in.
(5)
Fire resistance requirements:
floors: 2 hours
roof: 1 hour
columns: 2 hours
shearwalls:** 2 hours
Figure 1-4 shows the plan and elevation of Building #2.
* Assume 20 psf partitions + 10 psf ceiling and misc.
** Assume interior portions of walls enclose exit stairs.
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