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How will I get the actual member length of e.g. cables after the calculation by RF-FORM-FINDING?

Answer

This information is available in the Results navigator for members (see Figure 01). There, the member lengths are displayed in relation to the loaded system and the unloaded system. The "Loaded length" is obtained from the form-finding under consideration of the prestresses

The recalculation to the "unloaded length" can be done manually using Hooke's law:

${\mathrm l}_{\mathrm{unloaded}}\;=\;{\mathrm l}_{\mathrm{loaded}}\;-\;\mathrm{Δl}\\\\\mathrm\sigma\;=\;\mathrm E\;\cdot\;\mathrm\varepsilon\\\frac{\mathrm F}{\mathrm A}\;=\;\mathrm E\;\cdot\;\frac{\mathrm{Δl}}{\mathrm l}\\\mathrm{Δl}\;=\;\frac{\mathrm F\;\cdot\;\mathrm l}{\mathrm E\;\cdot\;\mathrm A}\\\\{\mathrm l}_{\mathrm{unloaded}}\;=\;{\mathrm l}_{\mathrm{loaded}}\;-\;\frac{\mathrm F\;\cdot\;{\mathrm l}_{\mathrm{loaded}}}{\mathrm E\;\cdot\;\mathrm A}\;=\;{\mathrm l}_{\mathrm{loaded}}\;\cdot\;\left(1-\;\frac{\mathrm F\;}{\mathrm E\;\cdot\;\mathrm A}\right)$

Keywords

Length Cable Form-finding

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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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RFEM Tensile Membrane Structures
RF-FORM-FINDING 5.xx

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Form-finding of tensile membrane and cable structures

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