FAQ 002438 EN

20 February 2019

Markus Baumgärtel General RFEM RSTAB

In RFEM, the Poisson's ratios of glued-laminated timber are incorrect for isotropic linear-elastic calculation: there are the values from 7 to 9.

Answer

For the calculation of members, this Poisson's ratio is irrelevant as it is only used for surfaces and solids.

For an isotropic material model, the Poisson's ratio is fixedly coupled with the modulus of elasticity and the shear modulus. If the Poisson's ratio will be too large and out of the limits, there is no isotropic material behaviour anymore. To avoid the problem, it is recommended to create an orthotropic material for surfaces and solids. For members, it is still necessary to select the isotropic material model. In this case, you can ignore the message.

Keywords

Poisson's ratio shear modulus modulus of elasticity isotropic material glued-laminated timber

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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 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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