Rotational stiffness of a haunched beam

Do you need to calculate the connection stiffness of a beam with a long haunch?

If you use a widener of the flange with a triangular shape on the beam and use the real length as a length of haunch, the beginning of the haunch will be cut (it’s longer then the length of the master beam).

This solution is suitable for the stress/strain analysis but not for the stiffness analysis. Let’s have a look at a better model definition for the stiffness analysis.

Create a general cross-section based on the geometry of cross-section right in front of the top flange of the column. This general cross-section could be defined in the General cross-section editor, using a few components.

After applying the general cross-section to the member, the stiffness analysis could be performed.

IDEA StatiCa Connection provides the stiffness diagram as a visualization of results and results table with the classification of the connection according to the EN 1993-1-8.