For a member with an unsymmetric cross-section, the load plane runs through the center of gravity of the cross-section and not through the shear center. Therefore, there should be torsion. However, the results show: M-T = 0!

Answer

The loads are relative to the shear center in RSTAB and RFEM. An intentional torsion due to the section geometry (center of gravity not equal the shear center) is therefore not considered. The graphic with the system line (=centroidal axis) and the load applied to it can lead to a wrong conclusion. Therefore, if you want to consider the torsion due to a loading which does not act in the shear center, an additional torsional moment (load x distance to shear center) is necessary.

Keywords

Torsion,  7 degrees of freedom, Warping Torsion

Contact us

Contact Dlubal Software

Have you found your question?
If not, contact us or send us your question via the online form.

(267) 702-2815

info-us@dlubal.com

RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
RSTAB Main Program
RSTAB 8.xx

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

Price of First License
2,550.00 USD
RFEM Steel and Aluminum Structures
RF-STEEL Warping Torsion 5.xx

Module Extension for RF-STEEL EC3

Warping torsion analysis according to the second-order theory with 7 degrees of freedom

Price of First License
850.00 USD
RSTAB Steel and Aluminum Structures
STEEL Warping Torsion 8.xx

Module Extension for STEEL EC3

Warping torsion analysis according to the second-order theory with 7 degrees of freedom

Price of First License
850.00 USD