Product Technical Guides : CA-EN Steel Deck Fastening Systems | Page 20

Steel Deck Fastening Systems
1.1 Steel Deck Fastener Design and Selection
Steel deck diaphragm stiffness and flexibility factor
design equations:
E x t
G' =
3.78 + 0.9 x D n + C , kips/in.
F =
With:
(Eq. 3.3-3)
1000
, micro-inches/lb
G'
(

1
t
C
=
29,500
x
x
S
x
S
f

α 1 + α 2 + n s x f
w
S s
D

D n =
< x 12
)
x < x 12 (Eq. 3.3-1)
(Eq. 3.3-2)
Reference Tables 7 and 9 for description and values of other
variables for common conditions.
E = modulus of elasticity for steel = 29,500 ksi
Table 7 – Diaphragm strength (S) and stiffness factor (G') equation variable values
D-Warping constant, in.
Deck
type Fastener
pattern α 1 – end
distribution
factor α 2 – purlin
distribution
factor Sx e2 ,
in. 2 Sx p2 ,
in. 2 A N,
ft -1 22 GA 20 GA 18 GA 16 GA
1-1/2"
Wide
Rib B-
Deck or
BI-
Deck 36/11
36/9
36/7
36/5
36/4
36/3 3.667
3.000
2.000
1.667
1.333
1.000 3.667
3.000
2.000
1.667
1.333
1.000 1944
1656
1008
936
720
648 1944
1656
1008
936
720
648 2
2
1
1
1
1 3.000
2.333
2.000
1.333
1.000
0.667 1548
1548
1548
9096
12864
26508 1164
1164
1164
6804
9624
19824 756
756
756
4464
6312
13008 540
540
540
3144
4452
9180
Table 8 – Diaphragm strength (S) equation variable values
Configuration
Min. deck
Deck tensile
(yield)
type strength,
ksi
45 (33)
B
92 (80)
BI
B
or
BI
45 (33)
45 or 92
(33 or 80)
Frame fastener
base material
thickness, in. Sidelap
connector 1,2
X-HSN 24
1/8 ≤ t f < 3/16 Hilti
SLC
X-HSN 24
3/16 ≤ t f ≤ 3/8 Hilti
SLC
X-ENP-19
t f ≥ 1/4 Hilti
SLC
S-MD 12-24x1-5/8 M HWH5
0.0598 ≤ t f ≤ 1/4 Hilti
SLC
X-HSN 24
1/8 ≤ t f < 3/16 Hilti
SLC
X-HSN 24
3/16 ≤ t f ≤ 3/8 Hilti
SLC
X-ENP-19
t f ≥ 1/4 Hilti
SLC
S-MD 12-24x1-5/8 M HWH5
0.0598 ≤ t f ≤ 1/4 Hilti
SLC
X-HSN 24
1/8 ≤ t f < 3/16 Hilti
SLC
X-HSN 24
3/16 ≤ t f ≤ 3/8 Hilti
SLC
S-MD 12-24x1-5/8 M HWH5
0.0598 ≤ t f ≤ 1/4 Hilti
SLC
X-HSN 24
1/8 ≤ t f ≤ 3/8 Hilti #10
HWH Screw
X-ENP-19
t f ≥ 1/4 Hilti #10
HWH Screw
S-MD 12-24x1-5/8 M HWH5
0.0598 ≤ t f ≤ 1/4 Hilti #10
HWH Screw
22
(0.0295)
Q f , lb Q s , lb
Correlation
factor, c
1357
844
1.155
1590
844
1.121
1597
844
1.257
1193
717
1.000
1357
844
1.155
1941
954
1.052
1964
954
1.197
1193
717
1.000
1357
844
1.155
1516
882
1.284
1193
717
1.000
1489
633
1.000
1603
633
1.000
1193
633
1.000
Deck gauge (inches)
20
18
(0.0358)
(0.0474)
Q f , lb Q s , lb Q f , lb Q s , lb
Correlation
Correlation
factor, c
factor, c
1824
1260
1865
1701
1.172
1.203
2107
1260
2663
1701
1.102
1.066
2112
1260
2764
1701
1.205
1.106
1661
870
1860
1152
1.000
1.000
1824
1260
1865
1701
1.172
1.203
2208
1341
2698
1859
1.054
1.058
2165
1341
3022
1859
1.166
1.108
1661
870
1860
1152
1.000
1.000
1712
1111
1865
1591
1.172
1.203
1712
1111
2450
1591
1.233
1.140
1661
870
1860
1152
1.000
1.000
1795
769
2348
1018
1.000
1.000
1933
769
2529
1018
1.000
1.000
1661
769
1860
1018
1.000
1.000
16
(0.0598)
Q f , lb Q s , lb
Correlation
factor, c
–
–
–
3035
2024
1.028
3079
2024
1.000
1860
1453
1.000
–
–
–
3095
2343
1.062
3577
2343
1.046
1860
1453
1.000
–
–
–
2553
2051
1.040
1860
1453
1.000
2924
1284
1.000
3149
1284
1.000
1860
1284
1.000
1 Sidelap connector spacing must meet the requirements of Table 10.
2 Reference Table 3 and Section 1.5 for more information on the proper selection of Hilti Sidelap Connectors (SLC).
18 Hilti, Inc. (US) 1-800-879-8000 | www.us.hilti.com I en español 1-800-879-5000 I Hilti (Canada) Corp. 1-800-363-4458 I www.hilti.ca I PTG Decking Supplement 2014