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Steel Beam Column Buckling Check

Calculate the steel beam column buckling resistance to compressive axial loads with this EN1993-1-1 compliant tool. This calculation checks the flexural, torsional and flexural-torsional capacity.

Input parameters

kN
mm
x L
x L
x L
mm

Default values

Beam buckling schema

Results

Cross-section class

Required class:

-

Applied class:

-

Effective buckling length

Strong axis (Lcr,y):

10000 mm

Weak axis (Lcr,z):

10000 mm

Torsional (Lcr,T):

20000 mm

Design buckling resistance

Flexural buckling about axis y-y (Nb,Rd,y):

- kN

Flexural buckling about axis z-z (Nb,Rd,z):

- kN

Torsional buckling (Nb,Rd,T):

- kN

Torsional-flexural buckling (Nb,Rd,TF):

- kN

Design check

Unity check buckling:

-

Parameters explained

Parameter nameSymbolUnitInfo text
Design axial forceNEdkNDesign compressive force.
LengthLmmTotal beam length.
Buckling length factorky,
kz		-Buckling length factor for bucling about y-y and z-z axis. Theoretical value of k varies between 0.5 and 2. It is possible to have lateral restains supporting the weak axis (z-z) of the beam. This would result in having a lower k_z factor than what is theoretically possible to reflect this.
Torsional buckling length factorkT-This factor accounts for the influence of the end support conditions on the member its effective length for torsional buckling. Theoretical value of k varies between 0.5 and 2 and generally, it is the same as k_y.
Distance support to shear centerdzmmDistance from lateral restraint to the shear center. This lateral restraint reduces the buckling length about the z-z axis.
Partial factor for stabilityγM1-Partial factor for stability
Buckling lengthLcr,y,
Lcr,z		mmBuckling length about y-y and z-z axis.
Torsional buckling lengthLcr,TmmTorsional buckling length of the unrestrained flange.
Design buckling resistanceNb,RdkNDesign buckling resistance (lowest)
Design flexural buckling resistance (y-y)Nb,Rd,ykNDesign buckling resistance (flexural y-y)
Design flexural buckling resistance (z-z)Nb,Rd,zkNDesign buckling resistance (flexural z-z)
Design torsional buckling resistanceNb,Rd,TkNDesign buckling resistance (torsional)
Design torsional-flexural buckling resistanceNb,Rd,TFkNDesign buckling resistance (torsional-flexural)
Unity checkUCThe ratio of the design load to the lowest design buckling resistance. A value less than or equal to 1.0 indicates that the design is acceptable under the given load.

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