Okay, I understand what you want to do: some car consisting of two (or four?) forces is trying to drive over the bridge, but for some reason it drives onto the arch. However, the 49-rep loop is not entirely clear to me. Perhaps you want to copy this car as if it were moving across a bridge?
In the method I am studying of setting a moving load, everything coincides with your approach until the loop of 49 repetitions. In my case I need to launch the ELLA module, select the traffic lane and assign a train. It is also necessary to indicate which forces in which elements this train will try to maximize, changing its position (setting the train along the line of influence).
Make sure you do the ASE linear calculation with a NOT parallel solver before calling ELLA.
+PROG SOFILOAD urs:16
HEAD Moving Load Trains
$ --------------------------------------------------- SOME CAR/TRAIN ------------------------------------------------------
LC 980 TYPE NONE FACT 1.0 GAMU 1.0 GAMF 1.0 TITL 'CAR'
TRAI TYPE USER V 0 PFAC 1.0 $ CAR
TRPL P 70 A 0 Y -0.95 BW 0.6 LW 0.2 $ POINT LOAD 1
TRPL P 70 A 0 Y 0.95 BW 0.6 LW 0.2 $ POINT LOAD 2
$ ---------------------------------------------- TRAFFIC LANES ----------------------------------------------
LANE 'CENT' WL -3.5 WR 3.5 YLA -4 YRA 4
LANE 'CENT.99' YLA -3.5 YRA 3.5 $ Fake lane for a proper report drawing
LANE 'CENT.1' YLA -3.5 YRA -0.5 $ we define a traffic lane S1.1 in your case I guess
END
+PROG ELLA urs:17
HEAD Moving Load
$ECHO IL FULL $ if necessary
ECHO IL NO
ECHO LPOS FULL
ECHO LANE FULL
ECHO LOAD FULL
$ ---------------------------------------------- CALCULATION SETTINGS ----------------------------------------------
LSEL 'CENT' INT 0 DZ 1.0 $ LSEL 'S1' in your case
CALC TYPE TRUS LMIN 1 LMAX 2 FROM 2*100000+1 $ Element numbers with group divisor. You can just enter the element number like 2000001
CALC TYPE TRUS LMIN 1 LMAX 2 FROM 2*100000+2
CALC TYPE TRUS LMIN 1 LMAX 2 FROM 2*100000+3
CALC TYPE TRUS LMIN 1 LMAX 2 FROM 2*100000+4
SHOW 0 TYPE ALL $ Influence Lines for all kinds of elements
$------------------------------- A14_L -------------------------------
SAVE LCB 12100 TYPE L TITL CAR_LC
CASE 1 GRP GR1 $ GR1 is only vertical forces are taken into account
POSL CENT.1 TRAI 980 FACT 1 P 0 SYNC OFF OPT FREE $ sets the train 980 (our car) to the traffic lane 1
END