FAQ 002438 EN 20 February 2019

Markus Baumgärtel General RFEM RSTAB

I noticed that in the program RFEM the transverse elongation numbers of glued laminated timber are incorrectly stored in isotropic linear elastic calculation. Values in the range 7 to 9 are stored there without manual change.


The transverse strain number does not matter for a rod calculation in the program, since this only has an influence for surfaces and solids. In the case of an isotropic material model, the transverse strain index is fixedly coupled to the shear modulus and the modulus of elasticity. If the transverse strain index becomes too large and leaves the boundaries, it is no longer an isotropic material behavior. To avoid this problem, it is advisable to create an orthotropic material for surfaces and solids. For bars, an isotropic material model must still be selected. The hint message can be ignored in this case.


Transverse stretch index shear modulus modulus of elasticity

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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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3,540.00 USD
RSTAB Main Program
RSTAB 8.xx

Main Program

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