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


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

- Access to shelter by ladder and railing for safety

- 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

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

- 4 x 4 posts at 12 feet long posts supporting platform

- 6 x 6 at 16 feet long for housed portion

- 4 x 4 king posts supporting roof truss

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 4 kneebraces

- 2 x 6 bridge girts

- 4 x 4 verticals and 2 x 4 horizontals for railing

- 2 x 6 patio joists

Connections- Posts secured to concrete with anchors

- Girt connections utilize housed mortise and tenon

- Extensive use of joint hangars

- Truss constructed with fabricated gusset plate

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

Axial Forces

Maximum Factored Loads:Maximum Factored Loads:

Rafters: 1.5 kips (tension)Rafters: 1.5 kips (tension)

Bottom Chords of Truss: 1.4 kips (compression)Bottom Chords of Truss: 1.4 kips (compression)

Kneebraces: 1.0 kips (compression)Kneebraces: 1.0 kips (compression)

L.R.F.D. Design Values:L.R.F.D. Design Values:

Rafters (4 x 4): 17.5 kips (tension)Rafters (4 x 4): 17.5 kips (tension)

Bottom Chords of Truss (4 x 4) , 6’ unbraced: 10.2 kips Bottom Chords of Truss (4 x 4) , 6’ unbraced: 10.2 kips (compression)(compression)

Kneebraces (2 x 4): 7.1 kips (compression)Kneebraces (2 x 4): 7.1 kips (compression)

4 x 44 x 4

4 x 4 4 x 4

2 x 4

Moment 2-2


Columns: 4.0 in.-kipsColumns: 4.0 in.-kips


Columns (6 x 6) : 40.7 in.-kipsColumns (6 x 6) : 40.7 in.-kips

6 x

6

6 x

6

6 x

6

Axial Forces


King Post: 5.0 kips (compression)King Post: 5.0 kips (compression)

Columns: 5.5 kips (compression)Columns: 5.5 kips (compression)


King Post (4 x 4) , 8’ unbraced: 10.2 kipsKing Post (4 x 4) , 8’ unbraced: 10.2 kips

Columns (6 x 6) , 8’ unbraced: 23.4 kips (compression)Columns (6 x 6) , 8’ unbraced: 23.4 kips (compression)

6 x

66

x 6

6 x

66

x 6

4 x

4

4 x

4

Moment 3-3


Ridge Beam: 53.0 in.-kipsRidge Beam: 53.0 in.-kips


Ridge Beam (4 x 10) : 99.7 in.-kipsRidge Beam (4 x 10) : 99.7 in.-kips

4 x 8

Shear 2-2Shear 2-2

Maximum Factored Load:Maximum Factored Load:

Ridge Beam: 2.8 kipsRidge Beam: 2.8 kips


Ridge Beam (4 x10) : 3.37 kipsRidge Beam (4 x10) : 3.37 kips

4 x 8

Axial Forces


Columns: 3.9 kipsColumns: 3.9 kips

Posts: 1.8 kipsPosts: 1.8 kips


Columns (6 x 6) , 6’ unbraced: 25.4 kipsColumns (6 x 6) , 6’ unbraced: 25.4 kips

Posts (4 x 4) , 8’ unbraced length: 10.2 kips Posts (4 x 4) , 8’ unbraced length: 10.2 kips

6 x

6

6 x

6

6 x

6

4 x

4

4 x

4

Moment 2-2Moment 2-2


Fascia Beam: 9.8 in.-kipsFascia Beam: 9.8 in.-kips

Fasica Beam , Moment 3-3: 23.0 in.-kipsFasica Beam , Moment 3-3: 23.0 in.-kips


Fascia Beam (4 x 6) : 24.3 in.-kipsFascia Beam (4 x 6) : 24.3 in.-kips

Fascia Beam (4 x 6) , Moment 3-3 : 38.2 in.-kipsFascia Beam (4 x 6) , Moment 3-3 : 38.2 in.-kips

4 x 6

4 x 6

Deformation due to Dead Load

Deformation due to Live Load

Deformation due to Snow Load

Deformation due to Wind Load

Quantities of Material Used

List of Members for Playground ProjectMember's

Lenghts Quantitytype: 2*2

3ft 33type: 2*4

2.5ft 22.8ft 203.0ft 153.2ft 24.5ft 2

type: 2*62ft 44ft 288ft 4

type: 2*83ft 14ft 128ft 10

type: 4*43ft 94ft 21

5.7ft 288ft 710ft 211.3ft 1812ft 616ft 2

type: 6*616ft 8

type: 4*10 16ft 1

type: 2*6 floor8ft 2816ft 32

type: 4*8 CDX plywood 20type: wood shingles 6

Cost of Materials Cost Information for Playground Project (timber)

Member Type Qty. price/member cost8ft (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

C o s t In fo rm a tio n fo r C o n n e c to rsc o nne c to r typ e Q ty. p r i c e /m e m b e r c o s t

jo is t ha ng e rs (2 " x (6 & 8 )" ) 6 0 0 .9 0$ 5 4 .0 0$ jo i s t ha ng e rs (4 " x 4 " ) 4 8 1 .1 0$ 5 2 .8 0$ ra fte r ha ng e r (4 " x 4 " ) 1 8 1 .2 0$ 2 1 .6 0$ p o s t a nc ho r (4 " x 4 " ) 4 1 0 .0 0$ 4 0 .0 0$ p o s t a nc ho r (6 " x 6 " ) 8 1 5 .0 0$ 1 2 0 .0 0$

ra fte r tie s 1 8 0 .3 0$ 5 .4 0$ g us s e t p la te 1 0 2 0 .0 0$ 2 0 0 .0 0$

la g s c re w s (1 /2 " x 5 " ) 2 4 0 .9 5$ 2 2 .8 0$ la g b o lts (5 /8 " x 4 " ) 8 1 .0 0$ 8 .0 0$ la g b o lts (5 /8 " x 6 " ) 1 6 1 .3 0$ 2 0 .8 0$

5 4 5 .4 0$

The End

Documents

CE 437 – Timber Design