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Built-up members

The capacity of the member in the z-axis direction is calculated as the sum of the capacities of the individual parts. The capacity in the y-axis direction is calculated in accordance with C.1.2(2)

where

Where is:

Atot

  • Total area of cross-section

kc

  • Instability factor calculated using an effective slenderness ratio λef determined using following formulas

Spaced members with packs or gussets

The total cross-sectional area is calculated in accordance with C.3.1(3):

The total moment of inertia is calculated in accordance with C.3.1(3):

The buckling verification in the z-axis direction is calculated as the sum of the capacities of the individual parts. The buckling verification in the y-axis direction is calculated in accordance with C.3.2(2)

Where is:

λ

  • The slenderness ratio for a solid member with the same length, the same area and the same second moment of area

λ1

  • The slenderness ratio for the shafts, minimum value is 30

n

  • The number of shafts

η

  • The factor given in table C.1

The slenderness ratio λ is calculated using formula

The slenderness ratio for the shafts λ1 is calculated using formula

The shear forces on the gussets or packs are calculated in accordance with formula (C.13)

Lattice members with glued or nailed joints

The effective slenderness ratio is calculated in accordance with C.4.2(2) using formula

Where is:

λtot

  • The slenderness ratio for a solid member with the same length, the same area and the same second moment of area

μ

  • The factor calculated using following formulas

The factor μ is calculated for a glued V-truss using formula (C.16)

Where is:

e

  • The eccentricity of the joints

Af

  • The area of the flange

If

  • The second moment of area of flange

l

  • The span

h

  • The distance of the flanges

The factor μ is calculated for a glued N-truss using formula (C.17)

The factor μ is calculated for a nailed V-truss using formula (C.18)

Where is:

n

  • The number of nails in a diagonal. If a diagonal consists of two or more pieces, n is thesum of the nails

Emean

  • Mean value of modulus of elasticity

Ku

  • The slip modulus of one nail for ULS

The factor μ is calculated for a nailed N-truss using formula (C.19)

Where is:

n

  • The number of nails in a diagonal. If a diagonal consists of two or more pieces, n is thesum of the nails

Emean

  • Mean value of modulus of elasticity

Ku

  • The slip modulus of one nail for ULS

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