Extra lines of data in globalForce recorder

[mairead]

Hi there,
I have a 3 span bridge and I apply a gravity load to the entire deck. I use globalforce recorders to record the forces in the deck. In the centre of the mid span however I get extra lines of data at the end of my gravity analysis for some reason. I have pasted the data in one of my recorders. Why is this happening do you know? Thanks.

0.1 54989.5 1.74E-11 -36987 2.96E-12 106207 -2.55E-10 -54989.5 -1.74E-11 55872.8 -2.96E-12 -59777 2.72E-10
0.2 109959 -1.35E-11 -73795.8 -2.31E-12 212950 -6.14E-10 -109959 1.35E-11 111567 2.31E-12 -120268 6.01E-10
0.3 164909 -3.67E-11 -110422 -1.84E-11 320239 -7.42E-10 -164909 3.67E-11 167080 1.84E-11 -181488 7.06E-10
0.4 219837 -4.59E-11 -146863 -1.39E-11 428087 -8.78E-10 -219837 4.59E-11 222406 1.39E-11 -243452 8.32E-10
0.5 274745 1.29E-10 -183113 -1.50E-13 536506 -8.51E-10 -274745 -1.29E-10 277542 1.50E-13 -306179 9.80E-10
0.6 329632 -3.47E-10 -219168 8.37E-12 645509 -1.50E-09 -329632 3.47E-10 332483 -8.37E-12 -369684 1.16E-09
0.7 389107 1.02E-10 -241020 -5.59E-11 795283 -1.63E-09 -389107 -1.02E-10 373220 5.59E-11 -488163 1.73E-09
0.8 439834 8.67E-11 -238661 -1.51E-11 997155 -1.84E-09 -439834 -8.67E-11 389748 1.51E-11 -682950 1.93E-09
0.9 453177 1.03E-10 -238250 2.58E-11 1.18E+06 -2.01E-09 -453177 -1.03E-10 408222 -2.58E-11 -854125 2.12E-09
1 466530 3.44E-11 -237680 -8.86E-12 1.36E+06 -1.22E-09 -466530 -3.44E-11 426538 8.86E-12 -1.03E+06 1.26E-09
4.86E+09 1.57E-10 -2.39E+06 -3.35E-09 3.31E+06 -2.23E-12 1.81E+07 3.19E-09
1 2.51E+06 -2.91E-10 -3.49E+06 3.34E-11 -1.64E+07 -7.39E-09 -2.51E+06 2.91E-10 3.68E+06 -3.34E-11 2.00E+07 7.10E-09

[vesna]

You may be doing some additional analysis after gravity. Would you show me the portion of your script where you perform the analysis.

[mairead]

Thanks for getting back to me. Here is my script. It only happens for the elements near the centre of the span.
#------------------------------------------------------------------------------------------------------------------------------------------------------
# GRAVITY ANALYSIS
#-------------------------------------------------------------------------------------------------------------------------------------------------------
set g 9.81;


set DeckUDL [expr $Adeck*$dens*$g];
set DiaUDL [expr $ADia*$dens*$g];
set ColUDL [expr $Acol*$dens*$g];

pattern Plain 1 Linear {


#DECK LOADS
eleLoad -ele 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 -type -beamUniform -$DeckUDL 0. 0.;
eleLoad -ele 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 -type -beamUniform -$DeckUDL 0. 0.;
eleLoad -ele 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 -type -beamUniform -$DeckUDL 0. 0.;
#DIAPHRAGM LOADS
eleLoad -ele 301 302 303 304 305 306 -type -beamUniform -$DiaUDL 0. 0.;
eleLoad -ele 307 308 309 310 311 312 -type -beamUniform -$DiaUDL 0. 0.;
#COLUMN LOADS
eleLoad -ele 401 402 403 404 405 406 407 -type -beamUniform 0. 0. $ColUDL ;
eleLoad -ele 408 409 410 411 412 413 414 -type -beamUniform 0. 0. $ColUDL ;
eleLoad -ele 415 416 417 418 419 420 421 -type -beamUniform 0. 0. $ColUDL ;
eleLoad -ele 422 423 424 425 426 427 428 -type -beamUniform 0. 0. $ColUDL ;


}


#=================================================================================================
# GRAVITY ANALYSIS
#=================================================================================================

#Karthiks analysis parameters
constraints Transformation
numberer RCM
system UmfPack
test NormDispIncr 1.0e-8 200;
algorithm Newton;

set NstepGravity 10;
set DGravity [expr 1./$NstepGravity];
integrator LoadControl $DGravity;

analysis Static;
set ok [analyze $NstepGravity];
loadConst -time 0.0

puts "GRAVITY ANALYSIS DONE"

[vesna]

Your scrip looks good. In case you do not have any other load applied after gravity you should not be getting these extra lines of output.

Do you have "wipe" command at the top and at the end of your script?

[mairead]

Yes I have the wipe command at the top and end of the script and it is still happening. It is strange that it only happens for certain elements. Any other ideas what could be going wrong?

[vesna]

Why don't you post your whole script indicating the elements that have extra lines.