HomeMy WebLinkAboutX2019-0058 - CalcsGUARDRAIL CALCULATION
Design Criteria
Rail Attachment Max. Spacing =
4.00
= 1.25
ft
Horizontal Load At Top of Railing =
50.00
= 3,000.00
lbs/ft
Concentrated Load any direction =
200.00
lb
Rail Height (max.) =
3.50
= 3.00
ft
material Used
Try 1.5in x 1.5in Steel Rod Q 4'-0" O.C.
Yeild Strength = 36,000.00 psi
Bending Strength (Fb = 0.6Fy) = 21,600.00 psi
Section Modulus (Sx) = 0.56 in"3
Post. Member Design
v = 50 ps£ x 4 ft =
M = 200 lbs x 3.5 ft =
fb = 700 ft -lbs x 12 /0.56 in3 =
Guardrail Attachment
T = 700 ft -lbs x 12 /3.5 in =
Required Lag Bolt Capacity /1"
2400 =
Req. = 2 Bolt x5" Thread x0.85 Env
OD 4�3 ,20/
)(2-01q- 0058
321 MOMM ire
200.00 lbs
700.00 ft -lbs
14,933.33 psi < Fb OK
v
2,400.00 lbs
282.35 lbs
From Table 11.2A NDS 2001
for Lag Screw Size = 3/8 in
Wood Grade DF -L, G = 0.5
Capacity = 305.00 lbs
> 282.35 OK
Use 4-3/8" x 4" Lag Bolts w/ 1/8" Thick Wachers
Base Plate Design
Arm
= (3.5" - 1")/2
= 1.25
in
M
= 2400 lbs x 1.25 in
= 3,000.00
in -lbs
Plate
Thickness Required (t)
b
= Plate Width
= 3.00
in
t
= sgrt{6 M /b Fb}
= 0.53
in
Use t
- 0.50
in
N
Exp. 06-30-2019
OF
3'-6"
1" 1"
3"
1..
3..
1..
1/2"x5"x5"
Base Plate
TYPICAL GUARDRAIL ATTACHMENT
steel Railing on wood, Guardrail Over Wood Floor Page 1