Transcript Document

CE 437 – Timber Design
CE 437 – Timber Design
Project: Playground
Dave Maruskin (el capitan)
Jason Huck (resident architect)
Jeff Leake (interior design)
Bryan Dhume (special joint designer)
Jason Manson (chief carpenter)
Zach Bazell (CAD technician)
Timber Design Project
Objective: To design and analyze
a timber playset using Load and
Resistance Factor Design
CE 437 – Timber Design
Project: Playground
Dave Maruskin (el capitan)
Jason Huck (resident architect)
Jeff Leake (interior design)
Bryan Dhume (special joint designer)
Jason Manson (chief carpenter)
Zach Bazell (CAD technician)
Specifications
- All members used are pressure treated Southern
yellow pine
- Two structures connected by a bridge: housed and
platform portions
- Each portion is 8 x 8 ft. and 8 ft. high
- 4 ft. walkway around shelter
- Roof covers an area of 16 x 16 ft. with a pitch of
12 on 12
- Access to shelter by ladder and railing for safety
Loads Applied (unfactored)
Dead Load (self-weight): 50 lb./ft.3
Live Load (roof): 12 lb./ft.2
Live Load (deck): 50 lb./ft.2
Snow Load (roof): 21.2 lb./ft.2
Snow Load (deck): 30 lb./ft.2
Wind Load (leeward side): 3.9 lb./ft.2
Wind Load (windward side): 6.25 lb./ft.2
Wind Load (roof lateral): 5.47 lb./ft.2
Shingles: 3 lb./ft.2
Major Vertical Members
- 6 x 6 at 16 feet long for housed portion
- 4 x 4 king posts supporting roof truss
- 4 x 4 posts at 12 feet long posts supporting platform
Elevation View
Elevation View – Bent 3
Elevation View – Bent 4
Major Horizontal Members
- 4 x 8 ridge beam at 16 feet long
- 4 x 6 fascia beams at 16 feet long
- 4 x 4 for truss rafters, chords
- 2 x 8 girts and joists on platform
- 2 x 8 joists in housed portion
Plan View – Bottom of Truss
Plan View – Deck
Other Materials
- 1” plywood sheathing
- 2 x 6 tongue-in-groove decking
- 2 x 6 patio joists
- 2 x 4 kneebraces
- 2 x 6 bridge girts
- 4 x 4 verticals and 2 x 4
horizontals for railing
Connections
- Posts secured to concrete with anchors
- Girt connections utilize housed mortise and tenon
- Truss constructed with fabricated gusset plate
- Extensive use of joint hangars
Detail – Post Anchor
Detail – Mortise & Tenon Joint/Joist Hangars
Detail – Truss Gusset Plate
SAP 2000 – Finite Element Analysis
- Structure treated as frame (connections transfer moment)
- Support connections assumed pinned
- Load factors applied:
Dead Load - 1.2
Live Load - 1.6
Snow Load - 0.5
Wind Load - 0.7
Maximum Factored Loads:
L.R.F.D. Design Values:
Rafters: 1.5 kips (tension)
Rafters (4 x 4): 17.5 kips (tension)
Bottom Chords of Truss: 1.4 kips (compression)
Bottom Chords of Truss (4 x 4) , 6’ unbraced: 10.2 kips
(compression)
Kneebraces: 1.0 kips (compression)
Kneebraces (2 x 4): 7.1 kips (compression)
Axial Forces
4x4
4x4
Maximum Factored Loads:
L.R.F.D. Design Values:
Columns: 4.0 in.-kips
Columns (6 x 6) : 40.7 in.-kips
6x6
6x6
6x6
Moment 2-2
Maximum Factored Loads:
L.R.F.D. Design Values:
King Post: 5.0 kips (compression)
King Post (4 x 4) , 8’ unbraced: 10.2 kips
Columns: 5.5 kips (compression)
Columns (6 x 6) , 8’ unbraced: 23.4 kips (compression)
6x6
6x6
4x4
6x6
6x6
4x4
Axial Forces
Maximum Factored Loads:
L.R.F.D. Design Values:
Ridge Beam: 53.0 in.-kips
Ridge Beam (4 x 10) : 99.7 in.-kips
Moment 3-3
4x8
Maximum Factored Load:
L.R.F.D. Design Values:
Ridge Beam: 2.8 kips
Ridge Beam (4 x10) : 3.37 kips
Shear 2-2
4x8
Maximum Factored Loads:
L.R.F.D. Design Values:
Columns: 3.9 kips
Columns (6 x 6) , 6’ unbraced: 25.4 kips
Posts: 1.8 kips
Posts (4 x 4) , 8’ unbraced length: 10.2 kips
4x4
4x4
6x6
6x6
6x6
Axial Forces
Maximum Factored Loads:
L.R.F.D. Design Values:
Fascia Beam: 9.8 in.-kips
Fascia Beam (4 x 6) : 24.3 in.-kips
Fasica Beam , Moment 3-3: 23.0 in.-kips
Fascia Beam (4 x 6) , Moment 3-3 : 38.2 in.-kips
Moment 2-2
4x6
4x6
Deformation due to
Dead Load
Deformation due to
Snow Load
Deformation due to
Live Load
Deformation due to
Wind Load
Quantities of Material Used
L is t o f M e m b e r s f o r P la y g r o u n d P r o je c t
M e m b e r 's
L e n g h ts
Q u a n ti ty
3 ft
33
2 .5 ft
2 .8 ft
3 .0 ft
3 .2 ft
4 .5 ft
2
20
15
2
2
2 ft
4 ft
8 ft
4
28
4
3 ft
4 ft
8 ft
1
12
10
3 ft
4 ft
5 .7 ft
8 ft
1 0 ft
1 1 .3 ft
1 2 ft
1 6 ft
9
21
28
7
2
18
6
2
1 6 ft
8
1 6 ft
1
ty p e : 2 * 2
ty p e : 2 * 4
ty p e : 2 * 6
ty p e : 2 * 8
ty p e : 4 * 4
ty p e : 6 * 6
ty p e : 4 * 1 0
ty p e : 2 * 6 flo o r
8 ft
1 6 ft
ty p e : 4 * 8 C D X p ly w o o d
ty p e : w o o d s h i n g le s
28
32
20
6
Cost of Materials
Cost Information for Playground Project (timber)
Member Type
Qty.
price/member
cost
8ft (2" x 2")
33
$
1.99 $ 65.67
8ft (2" x 4")
21
$
2.11 $
44.31
8ft (2" x 6")
37
$
2.80 $ 103.60
8ft (2" x 8")
17
$
4.16 $
70.72
8ft (4" x 4")
33
$
5.66 $ 186.78
16ft (4" x 4")
28
$
14.13 $ 395.64
16ft (6" x 6")
8
$
34.87 $ 278.96
16ft (4" x 8")
1
$
250.00 $ 250.00
8ft floor (2" x 6")
28
$
3.79 $ 106.12
16ft floor (2" x 6")
32
$
9.99 $ 319.68
4' x 8' CDX plywood
20
$
14.24 $ 284.80
wood shingles
6
$
34.00 $ 204.00
connectors (nail prices included where applicable) $ 545.40
$ 2,855.68
Connector Cost Breakdown
Cost Information for Connectors
connector type
Qty.
price/member
joist hangers (2" x (6&8)")
60
$
0.90
joist hangers (4" x 4")
48
$
1.10
rafter hanger (4" x 4")
18
$
1.20
post anchor (4" x 4")
4
$
10.00
post anchor (6" x 6")
8
$
15.00
rafter ties
18
$
0.30
gusset plate
10
$
20.00
lag screws (1/2" x 5")
24
$
0.95
lag bolts (5/8" x 4")
8
$
1.00
lag bolts (5/8" x 6")
16
$
1.30
$
$
$
$
$
$
$
$
$
$
$
cost
54.00
52.80
21.60
40.00
120.00
5.40
200.00
22.80
8.00
20.80
545.40
The End