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Column web in tension and compression

Column web in tension

The design resistance of unstiffened column web is calculated using expression

where the factor ω corresponds to the shear impact, table is shown in the chapter "Column web in shear".

The effective height in tension for welded connections is given by the expression

where

for hot-rolled cross-sections and

for welded cross-sections.

Beam connection to hot-rolled and welded columns

The effective column web width beff,t for bolted connections is equal to the effective length of eqivalent T-stub.

Column web in compression

The design resistance of unstiffened column web is calculated using expression

where the factor ω corresponds to the shear impact, table is shown in the chapter "Column web in shear". The resistance is limited by its stability, that is taken into account with the help of the factor ρ.

The effective height in compression for welded connections is given by the expression

where

for hot-rolled cross-sections and

for welded cross-sections.

The effective column web height beff,wc for bolted connections with end plate thickness tp is calculated using expression .

The last part of previous expression (2tp) may be limited by the cantilever dimension. Following formula may be used for connections with angles on flanges

Where is:

ta

  • The thickness of angle

ra

  • The root radius

Column web stability

The slenderness of column web is given by the formula

The web height of hot-rolled column dwc is given by the formula

The expression for welded columns:

The reduction factor ρ is given for

by the formula

and for

by the formula

Effect of axial stress in column

The axial stress may affect the resistance of column flange and web when calculating the compressive stresses. If the axial stress σcom,Ed at the beginning of root radius or weld edge of column flange is greater than 0,5fy,wc, The compressive resistance of column web Fc,wc,Rd is reduced by the factor kwc

Stiffness

The stiffness od unstiffened column web in compression k2 or stiffened or unstiffened column web in tension k3 is given by the formula

Where is:

beff,wc

  • The effective height of column web in compression or tension

dwc

  • The free column web height

twc

  • The column web thickness

The value of beff,t,wc for bolted connection with one row may be considered as the minimum of effective lengths Leff (individually or as a part of bolt group).

Column web stiffeners

The column web may be stiffened both in tension and compression. The Stiffeners shall have the thickness equal to the beam flange thickness and identical or better steel grade. The full capacity of stiffeners may be reached also for partial stiffeners, if the stiffeners length is longer than (bb+ twc)/2, where bb is beam width and twc is the column web thickness.

Column web stiffeners

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