Introducing Forces into Connection Lines

Tips & Tricks

001174 8 January 2016 Tips & Tricks RFEM Gerhard Rehm Results

In order to obtain forces for the design of surface connections, you can look at the results using the ‘Result diagram’ function of a connection line. Among others, there are the auxiliary tools such as ‘Average line’ and ‘Average region’.

When evaluating the results of a line, the program always displays all surface results adjacent to this line, so it is easy to lose track. Therefore, it is better to use ‘Sections’. The advantage of this is that you can select only the surfaces with the results which you want to evaluate. Moreover, you can display a graphical resultant of those sections. In this way, you can quickly review in which area the forces act.

In this example, the force of 5 kN/m × 8 m = 40 kN is introduced into a roof slab and the additional force of 8 kN/m × 8 m = 64 kN into a ceiling slab (total = 40 + 64 = 104 kN). They have to be introduced into the walls by means of shear.

Roof slab check: (19.46 + 0.17 + 19.94 + 0.40) kN = 40 kN
Ceiling slab check: (51.23 + 0.31 + 51.55 + 0.88) kN = 104 kN

Accuracy depends on the size of FE elements. In order to obtain clear view of the resultants, it is necessary to define separate surfaces. In other words: The walls should not continue through the ceiling slabs.

Relation of the resultants is explained in this article.

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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