Load Application Point of Positive Transverse Loads

Technical Article on the Topic Structural Analysis Using Dlubal Software

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Technical Article

Occasionally, the question arises how to determine the correct load application point of the positive transverse loads in RF-/STEEL EC3 and RF-/STEEL AISC.

Theoretical Background

The load application point of a load has a decisive impact on the determination of the critical lateral-torsional buckling moment. A load acting on the top flange in the direction of the shear center has a destabilizing effect. A force pulling on the bottom flange has a stabilizing effect.

Definition in RF-/STEEL EC3 and RF-/STEEL AISC

In the "Stability" tab of the detail settings, you can select the type of determination for the elastic critical moment for lateral-torsional buckling; see Image 01.

When determining the moment automatically, you can specify if the load application point of external transverse loads should be applied on the cross-section edge directed to the shear center, in the shear center, or on the other cross-section edge directed from the shear center.

The default setting is the unfavorable option (i.e., "directed to shear center", which is destabilizing). This way, a rather low lateral-torsional buckling moment is obtained.

Sign Rules for Load Application Position zg

Since a general solution has to be found without knowing the member or the cross-section rotation, the sign convention is defined according to the load direction with respect to the position of the shear center.

A positive transverse load directed to the shear center has positive eccentricity.

A positive transverse load directed from the shear center has negative eccentricity.

Author

Bastian Ackermann, M.Sc.

Bastian Ackermann, M.Sc.

Customer Support

Mr. Ackermann provides technical support for customers of Dlubal Software and takes care of their requests.

Keywords

Sign Eccentricity Load application Load application point Load application position Elastic critical moment

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  • Updated 27 October 2021

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