Helpful Questions & Answers

  • FAQ

Why does form-finding warp membrane surfaces into each other?

Answer

The form-finding warps the surfaces into each other because the defined prestress on the boundary line between two membranes does not coincide at the same angle, and thus the affected FE nodes are not in equilibrium with the boundary conditions. In this case, the FE nodes of the membrane surfaces move in the direction of the remaining resultants until the form-finding process finds a solution within the tolerance limit. Since it is usually possible to only achieve this solution with large displacement of FE nodes in space, the surfaces assigned to the FE nodes seem to "swim" into each other.

This behavior results in an unfavorable FE mesh arrangement in conjunction with a singular membrane force distribution. In this case, it is necessary to adjust the prestress in order to reach the equilibrium, or to set an element at the limit situation in order to transfer the forces due to the disequilibrium.


Keywords

Membrane Warp Prestress Equilibrium Singularity

Downloads

Write Comment...

Write Comment...

  • Views 122x
  • Updated 26 February 2021

Contact us

Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

+49 9673 9203 0

info@dlubal.com

CSA S16: 19 Steel design in RFEM

CSA S16:19 Steel Design in RFEM

Webinar 10 March 2021 2:00 PM - 3:00 PM EST

Online Training | English

Eurocode 5 | Timber structures according to EN 1995-1-1

Online Training 17 March 2021 8:30 AM - 12:30 PM CET

Online Training | English

Eurocode 3 | Steel structures according to DIN EN 1993-1-1

Online Training 18 March 2021 8:30 AM - 12:30 PM CET

Online Training | English

RFEM | Dynamics | USA

Online Training 23 March 2021 1:00 PM - 4:00 PM EST

Plate and Shell Buckling Utilizing Dlubal Software

Plate and Shell Buckling Utilizing Dlubal Software

Webinar 30 March 2021 2:00 PM - 2:45 PM

RFEM for Students | USA

Online Training 21 April 2021 1:00 PM - 4:00 PM EST

RFEM | Timber | USA

Online Training 5 May 2021 1:00 PM - 4:00 PM EST

Online Training | English

Eurocode 3 | Steel structures according to DIN EN 1993-1-1

Online Training 6 May 2021 8:30 AM - 12:30 PM

Online Training | English

Eurocode 2 | Concrete structures according to DIN EN 1992-1-1

Online Training 11 May 2021 8:30 AM - 12:30 PM

Online Training | English

Eurocode 5 | Timber structures according to DIN EN 1995-1-1

Online Training 20 May 2021 8:30 AM - 12:30 PM

Online Training | English

RFEM | Structural dynamics and earthquake design according to EC 8

Online Training 2 June 2021 8:30 AM - 12:30 PM

Online-Schulungen | English

RFEM | Basics | USA

Online Training 17 June 2021 9:00 AM - 1:00 PM EST

The Most Common User Errors With RFEM and RSTAB

The Most Common User Errors With RFEM and RSTAB

Webinar 4 February 2021 2:00 PM - 3:00 PM CET

Member design according to ADM 2020 in RFEM

ADM 2020 Member Design in RFEM

Webinar 19 January 2021 2:00 PM - 3:00 PM EST

Dlubal Info Day

Dlubal Info Day Online | 15 December 2020

Webinar 15 December 2020 9:00 AM - 4:00 PM CET

Stability Design in Steel Construction with RFEM and RSTAB

Stability Design in Steel Construction with RFEM and RSTAB

Webinar 1 December 2020 2:00 PM - 2:45 PM CET

FEM - Troubleshooting and Optimization in RFEM

FEA Troubleshooting and Optimization in RFEM

Webinar 11 November 2020 2:00 PM - 3:00 PM EST

Soil-Structure Interaction in RFEM

Soil-Structure Interaction in RFEM

Webinar 27 October 2020 2:00 PM - 2:45 PM CET

NBC 2015 Modal Response Spectrum Analysis in RFEM

Webinar 30 September 2020 2:00 PM - 3:00 PM EST

Documenting Results in the RFEM Printout Report

Documenting Results in the RFEM Printout Report

Webinar 25 August 2020 2:00 PM - 2:45 PM

ACI 318-19 Concrete Design in RFEM

Webinar 20 August 2020 2:00 PM - 3:00 PM EST

How to Be More Productive Using RFEM

How to Be More Productive Using RFEM

Webinar 7 July 2020 3:00 PM - 4:00 PM

Introduction to Solid Modeling \n in RFEM

Introduction to Solid Modeling in RFEM

Webinar 30 June 2020 2:00 PM - 3:00 PM EST

Modeling with Solids in RFEM

Modeling with Solids in RFEM

Webinar 9 June 2020 3:00 PM - 3:45 PM

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

Price of First License
3,540.00 USD
RFEM Tensile Membrane Structures
RF-FORM-FINDING 5.xx

Add-on Module

Form-finding of tensile membrane and cable structures

Price of First License
1,750.00 USD