Product Technical Guides : US-EN Direct Fastening - Volume 1 Edition 22 | Page 173

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Direct Fastening Technical Guide , Edition 22
Step 3 : Calculate nominal diaphragm shear strength limited by edge fasteners :
S ne
= { 2α 1 + n p x α 2 } P nf + n e P nfs = { 2 x 2 + 2 x 2 } x 2 , 107 + 18 x 2 , 107 = 3,043 plf L 18
AISI S310 Eq . D1-3
Where :
α 1
= α 2 = 2
P nf
= P nfs
n e
= L x 12 = 18 x 12 = 18 SS 12
Step 4 : Calculate nominal diaphragm shear strength controlled by connections and adjusted by the correlation factor : S nf
= min ( S ni , S nc
, and S ne ) c = 1,798 × 1.127 = 2,026 plf
Where : c = 1.127
Step 5 : Calculation allowable diaphragm shear strength controlled :
S nf
= 2,026 = 881 plf
Ω nf
2.30
Technical Guide Table 7
Technical Guide Table 8
Where :
Ω nf
= 2.30 Step 6 : Select allowable diaphragm buckling strength :
Technical Guide Table 11
S nb Technical Guide Table 12 = 2 , 591 plf
Ω nb
Step 7 : Determine allowable diaphragm shear strength :
S nf
S nf
S = , nb = 881 plf
Ω

(

Ω nf
Ω nf

)

AISI S310 Eq . D-1
Step 8 : Determine diaphragm stiffness :
Et

G ' = ( 2 ( 1 + μ ) s K , kips / in . AISI S310 Eq . D5.1.1-1

+ Y c
D n
+ C d

)

Et

G ' = ( 2 ( 1 + μ ) s + Y c

D n
+ C d

)

Et 29,500 x 0.0358

K = ( 3 . 78 + 0 . 9D + C ) = 3.78 + 0.9D n

+ C = 93 . 61 kips / in . AISI S310 Eq . D1-5
F = 1 , 000 = 1 , 000 = 10.68 micro-inches / lb
G ' 93.61 AISI S310 Eq . D1-7
Where :
D n
= D = 924 = 4.28
L 18 x 12
AISI S310 Eq . D1-8
D = 1,164 in .
Technical Guide Table 7
Et
2L

C = ( w s )( 2α 3 + n p α 4

+ 2n r s )

29,500 x 0.0358
2 x 18 x12
S f

= (

36

) = ( 2 x 2 + 2 x 2 + 2 x 18 x

0.0066 0 . 0066 = 5 . 65

)

0.0159
AISI S310 Eq . D5.1.1-2
s s
Where :
n s
= 18 , same as Step 3
n p
= 2
α 3
= α 4 = 2 Technical Guide Table 7
S f
= 0.0066 Technical Guide Table 9
S s
= 0.0159 Technical Guide Table 9
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