[DE] FAQ 004572 | Why does an eccentric member receive axial forces, although it is only loaded by shear forces?

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29 July 2020

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Gerhard Rehm

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Question

Why does an eccentric member receive axial forces, although it is only loaded by shear forces?

Answer

If a member is connected eccentrically to a surface or to another member, you can also imagine that each node (RSTAB) and each FE node (RFEM) of each element is coupled to the member (see Figure 01 on top). The result is identical to that of the defined eccentricities (see Figure 01 on bottom).

Figure 01 - Eccentricity with Rigid Members (top) and Defined Eccentricities (bottom)

The structural system shown in the figure is nothing more than a truss with an upper chord and a lower chord, which is connected to each other by means of verticals. As you known, the chords are increasingly stressed by axial forces and less by bending moments due to the geometry.

Figure 02 - Distribution of Bending Moment (top) and Axial Force (bottom)

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Dlubal FAQ Eccentric member Eccentricity Axial force Downstand beam Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal

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  • Updated 19 November 2020

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