For most of the geometrical models, especially if all the beams are straight, it is only necessary one beam element per line. To obtain it, generate the mesh with a big default element size. It should be chosen longer than any of the lines length. For this example 100 units can be chosen.
If there are curved lines, it can be necessary to mesh several beam elements for every line. To do so, use GiD options to control the mesh size like:
Meshing->Assing unstr. Sizes->Points
Meshing->Assing unstr. Sizes->Lines
Meshing->Assing unstr. Sizes->By cordal error
To generate the mesh use:
Meshing->Generate 100
Rambshell only accepts the default 2-noded beam elements. So quadratic option is not accepted for beams. Check the GiD manual for details.
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