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Verification of connection in built-up members

The axial force in the lacing without buckling consideration is given by the following expression

Where is:

Vy

  • The entered shear force

r

  • The number of planes of lacings

d

  • The length of lacing

h0

  • The distance of points of inertia of partial cross-sections

The resistance of lacing is calculated using formula

Where is:

Ad

  • The cross-sectional area of lacing

fy

  • The yield strength

γM0

  • The partial safety factor

Following expression has to be fulfilled

The axial force in the lacing including buckling consideration is given by the following expression

Where is:

Vy

  • The entered shear force

VS

  • The shear force in the point of lacing

d

  • The length of lacing

r

  • The number of planes of lacings

h0

  • The distance of points of inertia of partial cross-sections

The slenderness of the web is estimated according to the following formula:

Where is:

d

  • The web length

Ad

  • The cross-sectional area of web

The relative slenderness is given by the formula

where is

The value of the imperfection factor α, is set according to the buckling curve c. The factor χSp corresponds to the relative slenderness and is calculated using expression

however, this expression has to be fulfilled

where

The buckling resistance of the web is given by the expression

The webs are OK if the following expression is fulfilled:

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