# How to use results from ELLA in MAXIMA?

+PROG Ella
LET#ecc 1.875
LET#w 3
GAX NO S X Y Z
LAX 0 0 0 0.375
LAX 100 100 0 0.375
LANE NO SA SE YCA WR WL
LAX.1 0 96 #ecc #ecc+#w/2 #ecc-#w/2
LAX.2 0 96 -#ecc -#ecc+#w/2 -#ecc-#w/2
LSEL NO INT BWH
LAX 5 1.8
CALC TYPE LMAX LMIN
N 10 11
MY 20 21
VZ 30 31
CABL 40 41
TRUS 50 51
ACT Q
LC NO
100
TRAI TYPE
USER
TRPL P
360
TRBL P
10.5
SAVE LCB
200
CASE NO
300
POSL NO TRAI
LAX.1 100
LAX.2 100
PROG MAXIMA
COMB NO EXTR TYPE
1 EXPL DESI
G 1.2 1.2
P 1 1
Q 1.4 1.4
SUPP COMB EXTR
1 MAMI
END

ACT G and P are defined in SOFILOAD, ACT Q is defined in ELLA
I want to get results from 1.2G+1.0P+1.4Q
But only 1.2G+1.0P is calculated as shown below in report:

Combination rule Number 1
Superposition according to explicitly defined formula
1.20G+1.00P

Any solution?

• Check the maxima report with extended printout (e.g. which loads are included)
• In SUPP: Maybe specify only the elements, which have ELLA results
1 Like

Finally I manage to get 1.2G+1.0P+1.4Q in the Maxima,

but the value are not correct.
E.g. the max positive moment on the transverse beam of an arch bridge,

1. The value due to G is about 2793 + 849 kNm in Sofistik, and 2740 + 799 kNm in Midas Civil
2. The value due to P is about 0 kNm in Sofistik, and 0 kNm in Midas Civil
3. The value due to Q (moving load) is about 1762 kNm in Sofistik, and 1841 kNm in Midas Civil

The Maxima report that the max positive moment due to 1.2G+1.0P+1.4Q = 11915 kNm
The max positive moment in Midas Civil is 6824 kNm
The max positive moment by hand cacularion using 1.2 x (2793 + 849) + 1.0 x 0 + 1.4 x 1762 = 6837kNm

The value from hand calculation is similar to that from Midas Civil.
Why the value from Maxima (11915 kNm) is so big?

Probably your Q-combination is wrong: your chosen ACT-SUP-type is COND. ALL of your relevant Q-loadcases were add. It seems, you need the SUP-type EXCL (only the one and only max/min-Q-loadcase is decisive). (Or ACT L instead ACT C? Maybe, in L is SUP EXCL standard.)
And sfr wrote: “Check the maxima report …”. In the extended version you can see for every element all involved loadcases.

1 Like
PROG MAXIMA
COMB NO EXTR TYPE
1 EXPL DESI
G 1.2 1.2
P 1 1
Q 1.4 1.4
ECHO OPT VAL
FULL FULL
SUPP COMB EXTR ETYP FROM TO
1 MAMI BEAM ‘GRP’ 31
END

Since Q is “cond”, Maxima get 117878.48 kNm by
1.2*(2748.81+844.05)+1.4*(1735.21[Max-N]+24.88[Min-N]+1760.13[Max-My]+224.72[Max-Vz]+1588.86[Min-Vz]) = 17878.48 kNm

I define

ACT TYPE GAMU GAMF SUP
VE 1 1 EXCL

in Ella to get 1.2*(2748.81+844.05)+1.4*1760.13[Max-My]=6775 kNm, which is close to that from Midas Civil.

Thank you, @sfr and @ragl for the suggestions