In spite of having the hinge, I get a bending moment My for the rib member. Why?


The member internal forces (for example, the bending moment My) of the rib member are not only dependent on the defined member end hinges, but also on the surface internal forces in the plate. 

When entering the rib, specify an integration width of the surface internal forces, please.

The rib-related internal forces consist of the member internal forces which belong to the eccentrically connected rectangular cross-section and of the surface internal forces integrated over the integration width.

Now, this means that you can get a bending moment My for a rib member, despite the input of member end hinges, because the bending moment can originate from the integrated surface internal forces.

In the Display navigator, you can specify whether the results including the portion from the surface internal forces have to be displayed (default setting).

Or without the proportion of surface internal forces

In order to get a 'Zero-Crossing' of the moment My in the rib member, it would be necessary to insert a line hinge in the area of the connection of the plate to the wall.


Rib Release Moment T-beam Internal forces Downstand beam



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RFEM Main Program
RFEM 5.xx

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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

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