tributary area of structural members 3... · 2018. 8. 15. · tributary area of structural members...
TRANSCRIPT
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Tributary Area of Structural Members
StevenVukazichSanJoseStateUniversity
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A
B
C
D
1 2 3
22’-0” 22’-0” 1’-6”1’-6”1’-6”
18’-0”
18’-0”
18’-0”
1’-6”
6’-0” typ.W14x22
W14x22
W18x46
W14x22
W14x22
W18x46
W14x22
W14x22
W18x46
W18x46W14x22
W14x22
DO
DO
DO
DO
DO
DO
DO
DO
W18
x50
W18
x50
W18
x50
W18
x50
W18
x50
W18
x50
W18
x50
Dbl
6x6
1-1/2” 18 gaugemetal deck typ.
LoadPath
MetalDeck
Beams(e.g.W14x22)
GirdersorTruss(e.g.W18x50)
Columns
Foundation
Vertical (Gravity) Load Path
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Loads carried to the beam from the metal deck are uniformly distributed over the beam
Deck Carries Uniform Load to Beams
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Loads carried to the larger beam (girder) from the smaller beams are concentrated at the point of the connection and applied as point loads
Vertical (Gravity) Load Path
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Framingatoverhangingdeckcarriesloadtogirderatedge
Framing at Deck Overhang
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20 ft 16 ft
16 ft
10 ft
B1 B3
B2
J1
J2 C1
Joists @ 16 o.c.
! B2B3
Simpsonconnectors
Plywoodsheathing
16in 16in
J2Joist
Consider the Timber Framing System
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Joists(closelyspacedbeams)
SimpsonConnectors(joisthangers)
beam
Timbercolumn(post)
Timber Framing
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20 ft 16 ft
16 ft
10 ft
B1 B3
B2
J1
J2 C1
Joists @ 16” o.c.
8” 8”
Tributary Area of Joist J1
16in1ft12in
10ft = 13.3ft-
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20 ft 16 ft
16 ft
10 ft
B1 B3
B2
C1 8 ft
5 ft
Tributary Area of Beam B1
8ft + 5ft 20ft = 260ft-
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20 ft 16 ft
16 ft
10 ft
B1 B3
B2
J1
J2 C1
Joists @ 16 o.c.
!
Tributary Area of Beam B3(Similar to Beam B1)
8ft + 5ft 16ft = 208ft-
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20 ft 16 ft
16 ft
10 ft
B1 B3
B2
J1
J2 C1
Joists @ 16 o.c.
!
Tributary Area of Beam B2(Point load from Beam B3)
8ft + 5ft 8ft = 104ft-
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20 ft 16 ft
16 ft
10 ft
B1 B3
B2
C1 8 ft
5 ft
10 8 ft
Tributary Area of Column C1
8ft + 5ft 10ft + 8ft = 234ft-
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A
B
C
D
1 2 3
22’-0” 22’-0”
1’-6”1’-6”
1’-6”
18’-0”
18’-0”
18’-0”
6’-0” typ.
W14x22
W14x22
W18x46
W18x46
W18x46
W18x46W14x22
W14x22
DO
DO
DO
DO
DO
W18
x50
W18
x50
W18
x50
W18
x50
W18
x50
W18
x50
W14x22
Uniformly distributedload (lab 4)
Point load (lab 4)
Tributary Areaof W18x50 Girder
Tributary Areaof W14x22 beam
DO
DO
Tributary Area of Members in CE 160 Lab Building
6ft 22ft= 132ft-
6ft + 6ft 11ft + 11ft= 264ft-