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Figure 01 - Rigid Diagonals on Flange

Figure 02 - Incorrect Modeling of Rigid Diagonals on Flange

Figure 03 - Hinged Diagonals on Flange

Figure 04 - Rigid Diagonals on Flange with Vertical Between Flanges

Figure 05 - Rigid Diagonals on Flange with Vertical on Right Flange

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31 July 2019

FAQ 003368 EN

Structural Analysis & Design

Eurocode 3

The upper and lower flanges have to be joined by a column, but there are the verticals and diagonals connected to the flanges.
How do I arrange the hinges?

Answer

If the flanges are not continuous and the diagonals are fastened to the flanges, it may be necessary to enter an intermediate member.

Figure 1 shows a structural system where the flange is not continuous, but the diagonals are rigidly connected to the flange. To transfer the moments of the diagonals to the flange, the diagonal must get to the flange before the joint, otherwise the moment of the diagonal will be transferred to the opposite member (see Figure 02).

In the case the diagonals are also connected by hinges, you can waive the intermediate member. Please note that at least one member will not be hinged in order to prevent the connection node to rotate freely (see Figure 03).

If using a vertical, this must be connected on one of the two flanges or be between both flanges. In both cases, the model from Figure 1 arises, and has to be modified accordingly. Figure 04 shows the model with the vertical between the flanges and Figure 05 shows the model with the vertical on the right flange.