Steel Deck Fastening Systems
Steel Deck Fastener Design and Selection 1.1
Calculation steps
Step 7 : Calculate diaphragm stiffness : E x t
29,500 x 0.0358 G ' =
= = 86 kips / in .
3.78 + 0.9 x D n + C 3.78 + 0.9 x 5.39 + 3.65
|
F = 1000
G '
|
= 1000
85.99
|
= 11.6 micro-inches / lb |
where : |
|
|
|
D
1164
D n
=
=
< x 12
18 x 12
|
= 5.39
1
|
) )
C = E x t x S (
f x x < x 12 w α 1
+ α 2 + n s x S f
C = 29,500 x 0 . 0358 x 0 . 0066 ( x x 18 x 12 = 3.65
36
2 + 2 + 18 x 0 . 0066 0.0159
Step 8 : Calculate nominal uplift resistance : K x T
T n
= n , f
6.00 x 1,680 = = 560 psf
C x < v
3 x 6
Where : K = Number of frame fasteners per deck sheet per joist / beam = 6.00 C = Width of deck sheet = 3 feet
T n , F
= Controlling ultimate tension capacity of frame fastener = 560 lb x 3.0 = 1,680 lb
Step 9 : Apply uplift safety factor to determine allowable uplift resistance : T
T n ( ASD )
= n
560 = = 187 psf ≥ 35 psf
Ω UP
3.00 Step 10 : Check combined loading : 0.85 x ( Ω x Q ) + ( Ω UP x T ) ≤ 1.0
S
T n
0.85 x ( 2 . 35 x 650 ) + ( 3 . 00 x 35 ) ≤ 1.0 0.843 ≤ 1.0 1981 560
S s
Note : The Hilti Profis DF Diaphragm software provides full calculations for diaphragm shear and stiffness when desired .
1
SDI DDM03 Ref .
Eq . 3.3-3
Roof Deck Const . Handbook
Sec . 4.10
HNA Technical Guide
Sec . 1.1.8 and Tables 7 and 9
Sec . 1.2.3
Hilti is a leading manufacturer of direct fastening systems for steel and metal applications . As a member of the Steel Deck Institute ( SDI ), Hilti participates in and supports steel deck industry research at leading universities and test labs . Recent research projects with Hilti direct fastening systems have included inelastic seismic deck diaphragms and deep deck / cellular deck diaphragms .
Diaphragm data is calculated in accordance with SDI Diaphragm Design equations using specific Hilti fastener strength and stiffness values with data correlation adjustment factors in accordance with ICC-ES AC43 requirements .
Independent tests are the best guide to product performance and reliability , a philosophy to which Hilti and the SDI subscribe . The support for ongoing research programs is indicated by the number and scope of tests already performed and by the policy of sponsoring new tests when new products or applications are introduced . Hilti provides direct fastening system performance data , ICC-ES Evaluation Service Reports , design software , fire ratings and load test results for Hilti direct fastening systems used in steel deck applications .
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 23