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   Willamette  StrucJoist SJ-15-25-35  

StrucJoist - Page 9

 

 

TABLE I Design Properties

 

Joist

Series

Joist Depth (inches) Allowable Moment (ft-lbs) Max. Shear & End Reaction For 4" Long Bearing Max. End Reaction For 1 3/4" Bearing Max. Intermediate Reaction (lbs) Nail Only

El (x 106)

Glue-Nailed

El (x 106)

K (x106)
No Web Stiffeners With Web Stiffeners(6)
SJ-150 9-1/2" 2770 1125 975 1950 2440 164 196 4.94
11-7/8" 3710 1425 975 1950 2440 283 332 6.18
SJ-250 9-1/2" 3260 1125 1060 2120 2570 190 222 4.94
11-7/8" 4360 1425 1060 2120 2570 326 376 6.18
14" 5360 15506 1060 2120 2570 485 554 7.28
16" 6300 15506 1060 2120 2570 667 757 8.32
SJ-350 11-7/8" 5050 1425 1250 2500 2950 407 459 6.18
14" 6200 1550 1250 2500 2950 600 671 7.28
16" 7300 1550 1250 2500 2950 822 914 8.32
SJ-550 11-7/8" 7750 1750 1400 3375 3850 606 660 7.18
14" 9530 1750 1400 3375 3850 888 962 8.47
16" 11200 1750 1400 3375 3850 1209 1305 9.68

Notes:

  1. Glue-nailed El values are for 12" oc spacing and increase for wider joist spacing. Glue-nailed El values apply to floor use only.
  2. Both bending and shear deformations shall be considered when computing deflections. For bending deflection, use standard engineering formulae.
    For shear deflection use 8x bending moment/K.
    EXAMPLE: Uniformly distributed load on a simple span joist.
    Deflection - 5wt4/384EI + 8M/K = 5wl4/384EI + wl2/K
    w = uniform load in pounds per lineal inch
    I = effective span in inches
  3. The allowable moment, shear and reactions are for normal duration loading and can be increased in accordance with the code for load duration.
  4. Moment values shown are for non-repetitive use. For joist spacing of 24" o.c. or less, values may be increased 4%.
  5. 1-3/4" minimum bearing required at joist ends. 3-1/2" minimum bearing required at intermediate supports.
  6. Option - 5-1/4" bearing without web stiffeners.
  7. Design properties limited to untreated, dry conditions of use and assume lateral support full length of the compression flange.

TABLE II
Duct Hole Chart Maximum duct hole length
Joist

Series

Joist

Depth

JOIST SPACING (in.o.c.)
12 16 19.2 24
SJ-150 All Depths 12" 8" 6" 6"
SJ-250 9 -1/2" & 11-7/8" 13" 9" 8" 8"
14" & 16" 9" 8" 8" 8"
SJ-350 All Depths 12" 10" 10" 10"
SJ-550 All Depths 12" 10" 8" 8"

Notes:

  1. Do not cut or damage flanges. Do not overcut corners of holes.
  2. Full depth rectangular holes shall be located at center of span.
  3. A full depth rectangular hole is only allowed in longest span of multiple span joists.
  4. This table is valid for residential spans that meet the floor span tables in this product guide. Contact Willamette Industries for other applications.
  5. Other holes are not allowed within three times the duct hole length specified in table.
  6. Allowable depth of hole is depth of web minus 1/4".

 

TABLE III
ROUND HOLE CHART Minimum distance from face of nearest support to center of hole.
JOIST HOLE DIAMETER
SERIES DEPTH 3" 4" 5" 6" 6-1/4" 7" 8" 8-5/8" 9" 10" 10-3/4" 12" 12-3/4"
SJ-150 9-1/2"

11-7/8"

2'-6"

1'-6"

3'-6"

2'-6"

4'-6"

3'-6"

5'-6"

4'-6"

6'-0"

4'-6"

5'-6" 6'-6" 8'-0"          
SJ-250 9-1/2"

11-7/8"

14" 16"

3'-0"

2'-0"

1'-0"

1'-0"

4'-0"

3'-0"

1'-0"

1'-0"

5'-0"

4'-0"

2'-0"

1'-0"

6'-6"

5'-0"

3'-6"

1'-0"

7'-0"

5'-6"

4'-0"

1'-0"

6'-6"

4'-6"

2'-6"

8'-0"

6'-0"

5'-0"

9'-6"

7'-0"

5'-0"

 

7'-6"

5'-6"

 

9'-0"

7'-0"

 

11 '-6"

8'-0"

 

 

10'-6"

 

 

13'-0"

SJ-350 11-7/8"

14"

16"

3'-6"

1'-6"

1'-0"

4'-6"

3'-0"

1'-0"

5'-6"

4'-0"

1'-6"

7'-0"

5'-6"

3'-0"

7'-6"

6'-0"

3'-6"

8'-6"

6'-6"

5'-0"

10'-0"

8'-0"

6'-6"

11'-6"

9'-0"

7'-6"

10'-0"

8'-0"

11'-6"

9'-6"

13'-6"

11 '-0"

 

13'-6"

  

15'-0"

SJ-550 11-7/8"

14"

16"

2'-6"

2'-0"

1'-0"

 4'-6"

3'-6"

1'-0"

6'-0"

4'-6"

2'-0"

7'-6"

6'-0"

3'-6"

8'-0"

6'-6"

4'-0"

9'-6"

8'-0"

5'-6"

11'-0"

10'-0"

7'-0"

12'-6"

11'-0"

8'-6"

11'-6"

9'-0"

13'-6"

11'-6"

15'-6"

13'-0"

 

16'-0"

 

18'-0"

Notes:

  1. Do not cut or damage flanges.
  2. The clear distance between holes must equal or exceed twice the diameter of the largest hole, or three times the longest side of a rectangular hole.
  3. Except as noted in A and B above, a 2" diameter hole is permitted to be drilled anywhere.
  4. The longest side of a rectangular hole shall not exceed three-fourths of the allowable round hole diameter.
  5. This table is applicable only for uniformly loaded StrucJoist designed using the roof and floor span tables in this Product Guide. Contact Willamette Industries for other applications.
  6. Outermost spans of multiple span applications shall be at least 40% of the adjacent span.

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