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In the case of a single-span beam with uniform load (M = q * l2/8), the moment graphic is not displayed as a parabola. The table result values are correct only at the maximum, but not at the other locations.

Answer

The problem with the internal force graphic is due to the member divisions. In RSTAB, there are several divisions to consider.

1st Member divisions for result tables


The member divisions for result values can be created via "Insert" → "Model Data" → "Member Divisions." This division ensures that, for. For example, the internal forces of members can also be displayed at intermediate points in RSTAB Table 4.1. The graphical result display remains unchanged.

Figure 02 - member division

2nd Member divisions for graphical display


The divisions for the graphical result diagram and the extreme value determination can be viewed and influenced in the calculation parameters (pull-down menu "Calculation").


Figure 01 - Member division for result diagrams

If you set the value for "Result Diagrams" to a larger value, the internal force graphic is displayed more finely.

This division in the calculation parameters has to be considered globally. It is based on the longest member. Shorter members therefore do not have the same number of divisions, but similarly large sections.

To improve the graphic, it is therefore recommended to apply a finer member division.

Keywords

Member division Internal forces Round off Moment distribution Moment Triangular

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RFEM Main Program
RFEM 5.xx

Main Program

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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RSTAB Main Program
RSTAB 8.xx

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The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

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2,550.00 USD