Architecture 544 Wood Structures

Engineered Wood Products: I-Joists LVL PSL LSL

• Properties • NDS criteria • Literature & Design Aids • Applications

University of Michigan, TCAUP Wood Slide 1 of 50

APA – E30

University of Michigan, TCAUP Wood Slide 2 of 50 APA – Z725

University of Michigan, TCAUP Wood Slide 3 of 50

APA – manufacture of I Joists

University of Michigan, TCAUP Wood Slide 4 of 50 Manufactures – e.g. Weyerhaeuser

University of Michigan, TCAUP Wood Slide 5 of 50

NDS – Chap. 7

• General • Adjustment Factors

University of Michigan, TCAUP Wood Slide 6 of 50 NDS – Chap. 7

University of Michigan, TCAUP Wood Slide 7 of 50

I-Joists

University of Michigan, TCAUP Wood Slide 8 of 50 I-Joists

University of Michigan, TCAUP Wood Slide 9 of 50

I-Joists

University of Michigan, TCAUP Wood Slide 10 of 50 I-Joists

University of Michigan, TCAUP Wood Slide 11 of 50

I-Joists

University of Michigan, TCAUP Wood Slide 12 of 50 Weyerhaeuser – Trus Joist - TJI

University of Michigan, TCAUP Wood Slide 13 of 50

Weyerhaeuser – Trus Joist - TJI

University of Michigan, TCAUP Wood Slide 14 of 50 APA – Z725 I-Joist – rim board

University of Michigan, TCAUP Wood Slide 15 of 50

APA – Z725 I-Joist – web stiffeners

University of Michigan, TCAUP Wood Slide 16 of 50 Weyerhaeuser – Trus Joist – TJI - properties

University of Michigan, TCAUP Wood Slide 17 of 50

Weyerhaeuser – Trus Joist – TJI – span table

University of Michigan, TCAUP Wood Slide 18 of 50 Weyerhaeuser – Trus Joist – TJI – span table L/480

University of Michigan, TCAUP Wood Slide 19 of 50

I-Joist Selection procedure

1. Calculate actual load in PLF 2. Pick deflection limit (e.g. L/480) 3. Pick o.c. spacing

4. From load table find a section to carry load with span or 4. Calculate shear and moment 5. Pick section from properties table

6. Check deflection

University of Michigan, TCAUP Wood Slide 20 of 50 I-Joist Selection Example – floor joists

Given: span = 16 ft. 16’ o.c. = 24 in. 24” o.c. DL 10 psf LL 40 psf

1. Find floor load in PSF 2. Pick deflection limit (e.g. L/480) 3. Pick o.c. spacing – calculate PLF 4. From load table find a section to carry load with span

University of Michigan, TCAUP Wood Slide 21 of 50

Weyerhaeuser – Trus Joist - TJI

University of Michigan, TCAUP Wood Slide 22 of 50 Weyerhaeuser – Trus Joist - TJI

University of Michigan, TCAUP Wood Slide 23 of 50

I-Joist Selection Example – floor joists

Given: span = 16 ft. 16’ o.c. = 24 in. 24” o.c. DL 10 psf LL 40 psf

1. Calculate actual load in PLF 2. Pick deflection limit (e.g. L/360) 3. Pick o.c. spacing 4. Calculate shear and moment 5. Pick section from properties table 6. Calculate deflection

University of Michigan, TCAUP Wood Slide 24 of 50 Weyerhaeuser – Trus Joist - TJI

University of Michigan, TCAUP Wood Slide 25 of 50

Weyerhaeuser – Trus Joist - TJI

9.5” TJI 230 (without composite flooring)

University of Michigan, TCAUP Wood Slide 26 of 50 NDS – Chap. 8

LVL

PSL

LSL

OSL

University of Michigan, TCAUP Wood Slide 27 of 50

NDS – Chap. 8

University of Michigan, TCAUP Wood Slide 28 of 50 APA – from E30

University of Michigan, TCAUP Wood Slide 29 of 50

Manufactures – e.g. Weyerhaeuser

University of Michigan, TCAUP Wood Slide 30 of 50 Structural Composite Lumber

LVL

PSL

LSL

OSL

University of Michigan, TCAUP Wood Slide 31 of 50

Laminated Veneer Lumber - LVL

University of Michigan, TCAUP Wood Slide 32 of 50 Parallel Strand Lumber - PSL

University of Michigan, TCAUP Wood Slide 33 of 50

Parallel Strand Lumber - PSL

University of Michigan, TCAUP Wood Slide 34 of 50 Laminated Strand Lumber – LSL Oriented Strand Lumber - OSL

University of Michigan, TCAUP Wood Slide 35 of 50

Structural Composite Lumber

University of Michigan, TCAUP Wood Slide 36 of 50 Weyerhaeuser – Trus Joist LSL – LVL – PSL

TJ_9000

University of Michigan, TCAUP Wood Slide 37 of 50

Weyerhaeuser – Trus Joist – LSL – LVL – PSL TJ_9000.pdf

University of Michigan, TCAUP Wood Slide 38 of 50 Weyerhaeuser – Trus Joist – LSL – LVL – PSL

TJ_9000.pdf

University of Michigan, TCAUP Wood Slide 39 of 50

Weyerhaeuser – Trus Joist – LSL – LVL – PSL TJ_9000.pdf

University of Michigan, TCAUP Wood Slide 40 of 50 Weyerhaeuser – Trus Joist – LVL – Load Capacity Table

TJ_9000.pdf

University of Michigan, TCAUP Wood Slide 41 of 50

LVL – PSL – LSL Selection

1. Calculate total beam load 2. Choose beam span in chart 3. Find section to carry load or

2. Calculate shear and moment 3. Use properties chart to find section

4. Include adjustment factors: CD, CV

University of Michigan, TCAUP Wood Slide 42 of 50 LVL Example – Beam 4

Given: span = 24 ft. D 6 psf Lr 20 psf 24 ft

10 ft

1. Calculate total beam load 2. Choose beam span in chart 3. Find section to carry load

University of Michigan, TCAUP Wood Slide 43 of 50

LVL Example Beam 4

Span = 24 ft Load = 130 plf Lr = 100 plf

Pick 1 ¾” x 14”

University of Michigan, TCAUP Wood Slide 44 of 50 LVL – PSL – LSL Example – Beam 4

Given: span = 24 ft. D 6 psf Lr 20 psf 130 plf 24 ft

1. Calculate total beam load 10 ft

2. Calculate shear and moment 3. Use properties chart to find section 4. Check stresses 5. Check deflection

University of Michigan, TCAUP Wood Slide 45 of 50

Weyerhaeuser – Trus Joist – LSL – LVL – PSL

Moment: 9360 ft-lb

Shear: 1560 lbs

University of Michigan, TCAUP Wood Slide 46 of 50 LVL Example – Beam 4

Given: span = 24 ft. D 6 psf Lr 20 psf 130 plf (total load)

3. Use properties chart to find section

University of Michigan, TCAUP Wood Slide 47 of 50

Weyerhaeuser – Trus Joist – LSL – LVL – PSL

University of Michigan, TCAUP Wood Slide 48 of 50 LVL Example – Beam 4

Given: span = 24 ft. D 6 psf Lr 20 psf 130 plf 1 ¾” x 14”

4. Check stresses

University of Michigan, TCAUP Wood Slide 49 of 50

LVL Example – Beam 4

Given: span = 24 ft. D 6 psf Lr 20 psf 130 plf 1 ¾” x 14”

5. Check deflection

University of Michigan, TCAUP Wood Slide 50 of 50