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Welded connecton to column

Bending resistance

Binding resistance is calculated using formula

Inner lever arm for welded connection

The tensile resistance Ft,Rd is considered as a minimum of following values:

  • Column flange in bending Ft,fc,Rd
  • Column web in tension Ft,wc,Rd

The resulting resistance is limited by the resistance of part in compression and the resistance in shear:

  • The column web in shear Vwp,Rd
  • The column web in compression Fc,wc,Rd

Bending stiffness

The initial value of stiffness is calculated using expression:

The expression can be modified for non-linear part of the curve with the help of factor μ. The factor describes the difference between initial and tangential stiffness. The value of the factor is 1.0 in the linear part and is increasing with increasing value of bending moment.

Where is:

z

  • The inner lever arm

ψ

  • The curve factor (2.7 for connections with end plate)

κ

  • The factor of beginning of non-linear curve (value 1.5)

Med

  • The design value of bending moment

Components for calculation of stiffness:

k1, k2, k3

k2, k3

k1, k2, k3

Note: Marking corresponds to EN 1993-1-8.

Where is:

k1

  • The unstiffened column web in shear

k2

  • The stiffened column web in tension

k3

  • The unstiffened column web in tension

Unstiffened welded connections are considered as ductile, if the required rotation is smaller than ϕCD.min = 0,015 (EN 1993-1-8). Limiting value of rotation may be calculated for welded connections with stiffened web using formula

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