Test read data from Frame3DD file.

[ulrich1a]

If the direction of an edge goes into z-direction and only if it goes in global z-direction an direction parameter in CalculiX has to be set. This because this direction parameter goes into z-direction and this parameter should not go in the same direction as the edge member. Just try an simple line mesh in global z-direction.

I do consider this a bug in calculix.
The description of the beam element in the Calculix documentation describes how the local directions of the beam are determined. It should be sufficient to set the 1-Direction in a *Beam Section card to another direction than the global z-axis.

The error only happens with B32-elements. B31-elements do work in global z-axis. See the example input-file.


Ulrich

[bernd]

If the direction of an edge goes into z-direction and only if it goes in global z-direction an direction parameter in CalculiX has to be set. This because this direction parameter goes into z-direction and this parameter should not go in the same direction as the edge member. Just try an simple line mesh in global z-direction.

I do consider this a bug in calculix.

I did do a mailing list post a few month ago in this regard but I only got answer in the regard of how to avoid it. Guido Dhondt did not answer in this regard. I may post it again. It is a pitty calculix mailing list archive is only readable for logged in users.

I did not know it only apears on 3-node beam and not on 2-node beam. I need to test this too.

[bernd]

I started to write an export module for Freame3DD.

@chakkree:
All files on Frame3DD uses tab as delimiter. Do you know if Frame3DD accepts spaces as well?

[chakkree]

All files on Frame3DD uses tab as a delimiter. Do you know if Frame3DD accepts spaces as well?

I replace tabs with spaces in exA.3dd and run frame3dd.
Frame3DD accepted spaces for data separate.

I think. Tab separator may use when the user writes input file with a spreadsheet.

exA_space_delim.txt

(4.31 KiB) Downloaded 73 times

result run on PowerShell:

Code: Select all

PS D:\Frame3DD\Data\exA> frame3dd exA_space_delim.txt exA_space_delim.out
←[00;44;37;01m
 FRAME3DD version: 20140514+
 Analysis of 2D and 3D structural frames with elastic and geometric stiffness.
 http://frame3dd.sf.net
 GPL Copyright (C) 1992-2014, Henri P. Gavin
 This is free software with absolutely no warranty.
 For details, see the GPL license file, LICENSE.txt
←[00m
←[00;42;37;01m
 ** Example A: linear static analysis of a 2D truss with support settlement (kips in)   **
←[00m
 number of nodes .................................... nN =  12  ... complete
 number of nodes with reactions ..................... nR =  12  ... complete
 number of frame elements............................ nE =  21  ... complete
 number of load cases ............................... nL =   2
←[00;42;33;01m load case 1 of 2:                                             ←[00m
  number of loaded nodes ............................ nF =   5
  number of uniformly distributed loads ............. nU =   0
  number of trapezoidally distributed loads ......... nW =   0
  number of concentrated frame element point loads .. nP =   0
  number of temperature changes ..................... nT =   0
  number of prescribed displacements ................ nD =   1
←[00;42;33;01m load case 2 of 2:                                             ←[00m
  number of loaded nodes ............................ nF =   3
  number of uniformly distributed loads ............. nU =   0
  number of trapezoidally distributed loads ......... nW =   0
  number of concentrated frame element point loads .. nP =   0
  number of temperature changes ..................... nT =   3
  number of prescribed displacements ................ nD =   2
                                                      load data ... complete
 number of dynamic modes ............................ nM =   0
                                                      mass data ... complete
 missing matrix condensation data

←[00;42;33;01m Load Case 1 of 2 ...                                           ←[00m
 Linear Elastic Analysis ... Mechanical Loads
←[00m  RMS relative equilibrium error  = 7.278e-015  < tol = 1.0e-009 ←[00;44;33;01m ** converged ** ←[00m
  RMS residual incremental displ. = 6.120e-018 .................←[00;42;33;01m   not shabby!   ←[00m

←[00;42;33;01m Load Case 2 of 2 ...                                           ←[00m
 Linear Elastic Analysis ... Temperature Loads
 Linear Elastic Analysis ... Mechanical Loads
←[00m  RMS relative equilibrium error  = 2.625e-014  < tol = 1.0e-009 ←[00;44;33;01m ** converged ** ←[00m
  RMS residual incremental displ. = 1.040e-017 .................←[00;42;33;01m   very good!    ←[00m

←[00m

[johnwang]

Thanks for sharing.

[bernd]

did not know it even has python bindings ... https://forum.freecadweb.org/viewtopic.php?f=18&t=43389