What is the sign definition for the line release nonlinearity?

Answer

The determination of the direction is always determined by the line release axis system and by the position of the cut-free object. You can activate the display of the line-release axis system in the Project navigator - Display under Model -> Line releases (see Figure 1).

To specify the direction for the determination of nonlinearities, it is important to know, how the released object moves relative to the line release axis system of the original element.
In Figure 2, surface 2 is defined as a released object with the line release uz if vz is defined as negative. The loading shown in FIGS. 1 and 2 would move the released surface 2 counter to the z-axis of the line release axis system. Thus, the line release would not be effective for these loads, i.e. surfaces 1 and 2 would be firmly connected.

Keywords

Line release Line release axis system Release coordinate system Nonlinearity Sign Sign definition

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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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