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Detailed calculation method for horizontal composition (Gray book 2017 edition p229,235)

Scope of application

  1. The upper limit of ⊿Qa is 13.72kN/m

  2. The facing material is structural plywood T12, and the nails are N50 or CN50 nails.

  3. The length of the nail should be at least 2.5 times the thickness of the face material, and the thickness of the face material should be at least 12 mm. Structural plywood is JAS class 2, surface veneer is J1 (red pine, larch, Douglas fir, black pine, etc.) or J2 (cypress, cypress). , Beituga, Beihi, etc.)

  4. Nail pitch is 75mm or more, edge distance is 10mm or more and t×0.8 or more

  5. Joists do not have joints.

  6. Rafters shall be installed at intervals of 455 mm with a cross section of 45 x 60 or more.

  7. The end of the rafter shall be completely sunk into the main building.

types of nails
nail pitch
roof slope
tarukisuiheikomen.jpg
Horizontal structure of clad roof (floor)
Face material
​nail
k
kN/cm
δv
cm
δu
cm
⊿Pv
kN
GB
kN/cm2
t
cm
Ixy
cm2/cm2
Zxy
cm/cm2
Cxy
 

structural plywood
12mm

Iron round nail

N50

4.80

0.21

1.53

0.98

4.80

1.2

1.54

0.038

1.31

1.54

nail pitch
mm
PY = ⊿MY = Zxy･⊿Pv =
0.000
KR = ⊿KR = 1/(1/(Ixy･k)+1/(GB･t)) =
P150 = KR /150 = 
0.000
0.000
Pu = ⊿Mu = Cxy･⊿My =
0.000
μ0 = (δu･GB･t + δv･Ixy･k) / (δv･(GB･t+Ixy･k)) =
Ry0 = ⊿My/⊿KR =
0.000
Ry = PY/KR =
0.000
Ru = Ry+(μ0-1)･Ry0 =
μ = Ru/Ry = 
0.000
0.000
0.000
0.2･((2･μ-1)^1/2)･Pu = 
0.000
⊿Qa = min{Py , P150 , 0.2･((2･μ-1)^1/2)･Pu} = 
0.000
​Reduction by slope
​Gradient: θ=
0.000
​⊿Qareduction = ⊿Qa･cosθ =
0.000
​Allowable shear force per unit length
⊿Qa =
0.000
kN/m
​単位長さ辺りの許容せん断力
​（勾配による低減考慮）
⊿Qareduction =
0.000
kN/m
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