Same MAXIMA script - but one of them applies all loads twice

SOFiSTiK
1

Hello
Im using this maxima script to do my final envelopes.
For some reason combination 906 applies all loads twice, and i cannot see the error.
Does anyone here have an idea as to why or how this could happen? when i run a trace on 905 its as it should be. but 906 has the same loads applied twice.

Blockquote
+prog maxima urs:10 $ SLS CHR dom. LL - incl. LL
head
$echo full yes
ctrl warn 18 ! nonlinear envelope

sto#comb 905
Comb #comb base #comb*100 EXTR DESI TYPE 'SL_5' TITL 'SLS CHR dom. LL - incl. LL'
    ACT 'SC_2'   SUP ALEX
    ACT 'SC_3'   SUP ALEX GAMU 1
    ACT 'CO_2'   SUP ALEX
    ACT 'SL_2'   SUP ALEX
    SUPP #comb MAMI NODE P,UX,UY,UZ TITL 'SLS CHR dom. LL - incl. LL'
    SUPP #comb MAMI QUAD M,VX,VY,N TITL 'SLS CHR dom. LL - incl. LL'
    SUPP #comb MAMI QNOD M,VX,VY,N TITL 'SLS CHR dom. LL - incl. LL'
END

+prog maxima urs:22 $ SLS CHR dom. Wind
head
$echo full yes
ctrl warn 18 ! nonlinear envelope

sto#comb 906
Comb #comb base #comb*100 EXTR DESI TYPE 'SL_8' TITL 'SLS CHR dom. Wind'
    ACT 'SC_2'   SUP ALEX
    ACT 'SC_3'   SUP ALEX GAMU 1
    ACT 'CO_2'   SUP ALEX
    ACT 'SL_4'   SUP ALEX
    SUPP #comb MAMI NODE P,UX,UY,UZ TITL 'SLS CHR dom. Wind'
    SUPP #comb MAMI QUAD M,VX,VY,N TITL 'SLS CHR dom. Wind'
    SUPP #comb MAMI QNOD M,VX,VY,N TITL 'SLS CHR dom. Wind'
END
2

Hello Morten,

only with the MAXIMA input it is not possible to give an assessment. How the superposition is done depends on the input of the actions in SOFiLOAD and on the assigned load cases.

You have defined the superposition according to the equation 6.10 EN 1990 with Comb … EXTR DESI. It means, the safety factor GAMU and in case of a permanent action also GAMF are used. On the other hand you have defined SUP ALEX in the records ACT. This makes only sense for permanent actions with PART G in record ACT.

The resulting superposition load cases are assigned to the action SL → in combination 905 to category SL_5 and in combination 906 to category SL_8. Should the resulting load cases use in further combinations using the action SL?

Do you want to determine the most unfavourable load case from a non-linear analyses? → ctrl warn 18 ! nonlinear envelope
The best way to determine the envelope of non-linear load cases is to use a standard combination only with the non-linear load cases:
e.g.

COMB #comb EXTR NONL TYPE …
LC NO … TYPE AG1
LC NO … TYPE AG1
LC NO … TYPE AG1
…
SUPP ….

The initial load cases are defined in the permanent alternative group AG1. It means that for every superposition only one load case (the most unfavourable one with factor 1.0) is determined by MAXIMA.

Regards
Sabine Fahrendholz
Senior Product Manager

3

Thank you very much!