Dear，i have a question about gravity. I have established a beam model. The node at start point is (0,0,0) and the end node is (86.82, 0,492.40) and there are 499 nodes between these two nodes. Then I carry out the gravity analysis. But the deformation of the beam is very large. Could anyone can tell me the reason?
wipe
# pipe geometry and mesh
# pipe nodes created with 3 dimensions, 6 degrees of freedom
model BasicBuilder -ndm 3 -ndf 6
node 1 0 0 0
node 2 0.173648201 0 0.984807749
node 3 0.347296402 0 1.969615498
node 4 0.520944603 0 2.954423247
node 5 0.694592804 0 3.939230996
node 6 0.868241006 0 4.924038744
node 7 1.041889207 0 5.908846493
node 8 1.215537408 0 6.893654242
node 9 1.389185609 0 7.878461991
node 10 1.56283381 0 8.86326974
node 11 1.736482011 0 9.848077489
node 12 1.910130212 0 10.83288524
node 13 2.083778413 0 11.81769299
node 14 2.257426615 0 12.80250074
node 15 2.431074816 0 13.78730848
node 16 2.604723017 0 14.77211623
node 17 2.778371218 0 15.75692398
node 18 2.952019419 0 16.74173173
node 19 3.12566762 0 17.72653948
node 20 3.299315821 0 18.71134723
node 21 3.472964022 0 19.69615498
node 22 3.646612224 0 20.68096273
node 23 3.820260425 0 21.66577048
node 24 3.993908626 0 22.65057822
node 25 4.167556827 0 23.63538597
node 26 4.341205028 0 24.62019372
node 27 4.514853229 0 25.60500147
node 28 4.68850143 0 26.58980922
node 29 4.862149631 0 27.57461697
node 30 5.035797833 0 28.55942472
node 31 5.209446034 0 29.54423247
node 32 5.383094235 0 30.52904022
node 33 5.556742436 0 31.51384796
node 34 5.730390637 0 32.49865571
node 35 5.904038838 0 33.48346346
node 36 6.077687039 0 34.46827121
node 37 6.25133524 0 35.45307896
node 38 6.424983442 0 36.43788671
node 39 6.598631643 0 37.42269446
node 40 6.772279844 0 38.40750221
node 41 6.945928045 0 39.39230996
node 42 7.119576246 0 40.3771177
node 43 7.293224447 0 41.36192545
node 44 7.466872648 0 42.3467332
node 45 7.640520849 0 43.33154095
node 46 7.814169051 0 44.3163487
node 47 7.987817252 0 45.30115645
node 48 8.161465453 0 46.2859642
node 49 8.335113654 0 47.27077195
node 50 8.508761855 0 48.25557969
node 51 8.682410056 0 49.24038744
node 52 8.856058257 0 50.22519519
node 53 9.029706458 0 51.21000294
node 54 9.20335466 0 52.19481069
node 55 9.377002861 0 53.17961844
node 56 9.550651062 0 54.16442619
node 57 9.724299263 0 55.14923394
node 58 9.897947464 0 56.13404169
node 59 10.07159567 0 57.11884943
node 60 10.24524387 0 58.10365718
node 61 10.41889207 0 59.08846493
node 62 10.59254027 0 60.07327268
node 63 10.76618847 0 61.05808043
node 64 10.93983667 0 62.04288818
node 65 11.11348487 0 63.02769593
node 66 11.28713307 0 64.01250368
node 67 11.46078127 0 64.99731143
node 68 11.63442948 0 65.98211917
node 69 11.80807768 0 66.96692692
node 70 11.98172588 0 67.95173467
node 71 12.15537408 0 68.93654242
node 72 12.32902228 0 69.92135017
node 73 12.50267048 0 70.90615792
node 74 12.67631868 0 71.89096567
node 75 12.84996688 0 72.87577342
node 76 13.02361508 0 73.86058117
node 77 13.19726329 0 74.84538891
node 78 13.37091149 0 75.83019666
node 79 13.54455969 0 76.81500441
node 80 13.71820789 0 77.79981216
node 81 13.89185609 0 78.78461991
node 82 14.06550429 0 79.76942766
node 83 14.23915249 0 80.75423541
node 84 14.41280069 0 81.73904316
node 85 14.58644889 0 82.72385091
node 86 14.7600971 0 83.70865865
node 87 14.9337453 0 84.6934664
node 88 15.1073935 0 85.67827415
node 89 15.2810417 0 86.6630819
node 90 15.4546899 0 87.64788965
node 91 15.6283381 0 88.6326974
node 92 15.8019863 0 89.61750515
node 93 15.9756345 0 90.6023129
node 94 16.1492827 0 91.58712065
node 95 16.32293091 0 92.57192839
node 96 16.49657911 0 93.55673614
node 97 16.67022731 0 94.54154389
node 98 16.84387551 0 95.52635164
node 99 17.01752371 0 96.51115939
node 100 17.19117191 0 97.49596714
node 101 17.36482011 0 98.48077489
node 102 17.53846831 0 99.46558264
node 103 17.71211651 0 100.4503904
node 104 17.88576472 0 101.4351981
node 105 18.05941292 0 102.4200059
node 106 18.23306112 0 103.4048136
node 107 18.40670932 0 104.3896214
node 108 18.58035752 0 105.3744291
node 109 18.75400572 0 106.3592369
node 110 18.92765392 0 107.3440446
node 111 19.10130212 0 108.3288524
node 112 19.27495032 0 109.3136601
node 113 19.44859853 0 110.2984679
node 114 19.62224673 0 111.2832756
node 115 19.79589493 0 112.2680834
node 116 19.96954313 0 113.2528911
node 117 20.14319133 0 114.2376989
node 118 20.31683953 0 115.2225066
node 119 20.49048773 0 116.2073144
node 120 20.66413593 0 117.1921221
node 121 20.83778413 0 118.1769299
node 122 21.01143234 0 119.1617376
node 123 21.18508054 0 120.1465454
node 124 21.35872874 0 121.1313531
node 125 21.53237694 0 122.1161609
node 126 21.70602514 0 123.1009686
node 127 21.87967334 0 124.0857764
node 128 22.05332154 0 125.0705841
node 129 22.22696974 0 126.0553919
node 130 22.40061794 0 127.0401996
node 131 22.57426615 0 128.0250074
node 132 22.74791435 0 129.0098151
node 133 22.92156255 0 129.9946229
node 134 23.09521075 0 130.9794306
node 135 23.26885895 0 131.9642383
node 136 23.44250715 0 132.9490461
node 137 23.61615535 0 133.9338538
node 138 23.78980355 0 134.9186616
node 139 23.96345175 0 135.9034693
node 140 24.13709996 0 136.8882771
node 141 24.31074816 0 137.8730848
node 142 24.48439636 0 138.8578926
node 143 24.65804456 0 139.8427003
node 144 24.83169276 0 140.8275081
node 145 25.00534096 0 141.8123158
node 146 25.17898916 0 142.7971236
node 147 25.35263736 0 143.7819313
node 148 25.52628557 0 144.7667391
node 149 25.69993377 0 145.7515468
node 150 25.87358197 0 146.7363546
node 151 26.04723017 0 147.7211623
node 152 26.22087837 0 148.7059701
node 153 26.39452657 0 149.6907778
node 154 26.56817477 0 150.6755856
node 155 26.74182297 0 151.6603933
node 156 26.91547117 0 152.6452011
node 157 27.08911938 0 153.6300088
node 158 27.26276758 0 154.6148166
node 159 27.43641578 0 155.5996243
node 160 27.61006398 0 156.5844321
node 161 27.78371218 0 157.5692398
node 162 27.95736038 0 158.5540476
node 163 28.13100858 0 159.5388553
node 164 28.30465678 0 160.5236631
node 165 28.47830498 0 161.5084708
node 166 28.65195319 0 162.4932786
node 167 28.82560139 0 163.4780863
node 168 28.99924959 0 164.4628941
node 169 29.17289779 0 165.4477018
node 170 29.34654599 0 166.4325096
node 171 29.52019419 0 167.4173173
node 172 29.69384239 0 168.4021251
node 173 29.86749059 0 169.3869328
node 174 30.04113879 0 170.3717406
node 175 30.214787 0 171.3565483
node 176 30.3884352 0 172.3413561
node 177 30.5620834 0 173.3261638
node 178 30.7357316 0 174.3109716
node 179 30.9093798 0 175.2957793
node 180 31.083028 0 176.280587
node 181 31.2566762 0 177.2653948
node 182 31.4303244 0 178.2502025
node 183 31.6039726 0 179.2350103
node 184 31.77762081 0 180.219818
node 185 31.95126901 0 181.2046258
node 186 32.12491721 0 182.1894335
node 187 32.29856541 0 183.1742413
node 188 32.47221361 0 184.159049
node 189 32.64586181 0 185.1438568
node 190 32.81951001 0 186.1286645
node 191 32.99315821 0 187.1134723
node 192 33.16680641 0 188.09828
node 193 33.34045462 0 189.0830878
node 194 33.51410282 0 190.0678955
node 195 33.68775102 0 191.0527033
node 196 33.86139922 0 192.037511
node 197 34.03504742 0 193.0223188
node 198 34.20869562 0 194.0071265
node 199 34.38234382 0 194.9919343
node 200 34.55599202 0 195.976742
node 201 34.72964022 0 196.9615498
node 202 34.90328843 0 197.9463575
node 203 35.07693663 0 198.9311653
node 204 35.25058483 0 199.915973
node 205 35.42423303 0 200.9007808
node 206 35.59788123 0 201.8855885
node 207 35.77152943 0 202.8703963
node 208 35.94517763 0 203.855204
node 209 36.11882583 0 204.8400118
node 210 36.29247403 0 205.8248195
node 211 36.46612224 0 206.8096273
node 212 36.63977044 0 207.794435
node 213 36.81341864 0 208.7792428
node 214 36.98706684 0 209.7640505
node 215 37.16071504 0 210.7488583
node 216 37.33436324 0 211.733666
node 217 37.50801144 0 212.7184738
node 218 37.68165964 0 213.7032815
node 219 37.85530784 0 214.6880893
node 220 38.02895605 0 215.672897
node 221 38.20260425 0 216.6577048
node 222 38.37625245 0 217.6425125
node 223 38.54990065 0 218.6273203
node 224 38.72354885 0 219.612128
node 225 38.89719705 0 220.5969357
node 226 39.07084525 0 221.5817435
node 227 39.24449345 0 222.5665512
node 228 39.41814165 0 223.551359
node 229 39.59178986 0 224.5361667
node 230 39.76543806 0 225.5209745
node 231 39.93908626 0 226.5057822
node 232 40.11273446 0 227.49059
node 233 40.28638266 0 228.4753977
node 234 40.46003086 0 229.4602055
node 235 40.63367906 0 230.4450132
node 236 40.80732726 0 231.429821
node 237 40.98097546 0 232.4146287
node 238 41.15462367 0 233.3994365
node 239 41.32827187 0 234.3842442
node 240 41.50192007 0 235.369052
node 241 41.67556827 0 236.3538597
node 242 41.84921647 0 237.3386675
node 243 42.02286467 0 238.3234752
node 244 42.19651287 0 239.308283
node 245 42.37016107 0 240.2930907
node 246 42.54380928 0 241.2778985
node 247 42.71745748 0 242.2627062
node 248 42.89110568 0 243.247514
node 249 43.06475388 0 244.2323217
node 250 43.23840208 0 245.2171295
node 251 43.41205028 0 246.2019372
node 252 43.58569848 0 247.186745
node 253 43.75934668 0 248.1715527
node 254 43.93299488 0 249.1563605
node 255 44.10664309 0 250.1411682
node 256 44.28029129 0 251.125976
node 257 44.45393949 0 252.1107837
node 258 44.62758769 0 253.0955915
node 259 44.80123589 0 254.0803992
node 260 44.97488409 0 255.065207
node 261 45.14853229 0 256.0500147
node 262 45.32218049 0 257.0348225
node 263 45.49582869 0 258.0196302
node 264 45.6694769 0 259.004438
node 265 45.8431251 0 259.9892457
node 266 46.0167733 0 260.9740535
node 267 46.1904215 0 261.9588612
node 268 46.3640697 0 262.9436689
node 269 46.5377179 0 263.9284767
node 270 46.7113661 0 264.9132844
node 271 46.8850143 0 265.8980922
node 272 47.0586625 0 266.8828999
node 273 47.23231071 0 267.8677077
node 274 47.40595891 0 268.8525154
node 275 47.57960711 0 269.8373232
node 276 47.75325531 0 270.8221309
node 277 47.92690351 0 271.8069387
node 278 48.10055171 0 272.7917464
node 279 48.27419991 0 273.7765542
node 280 48.44784811 0 274.7613619
node 281 48.62149631 0 275.7461697
node 282 48.79514452 0 276.7309774
node 283 48.96879272 0 277.7157852
node 284 49.14244092 0 278.7005929
node 285 49.31608912 0 279.6854007
node 286 49.48973732 0 280.6702084
node 287 49.66338552 0 281.6550162
node 288 49.83703372 0 282.6398239
node 289 50.01068192 0 283.6246317
node 290 50.18433012 0 284.6094394
node 291 50.35797833 0 285.5942472
node 292 50.53162653 0 286.5790549
node 293 50.70527473 0 287.5638627
node 294 50.87892293 0 288.5486704
node 295 51.05257113 0 289.5334782
node 296 51.22621933 0 290.5182859
node 297 51.39986753 0 291.5030937
node 298 51.57351573 0 292.4879014
node 299 51.74716393 0 293.4727092
node 300 51.92081214 0 294.4575169
node 301 52.09446034 0 295.4423247
node 302 52.26810854 0 296.4271324
node 303 52.44175674 0 297.4119402
node 304 52.61540494 0 298.3967479
node 305 52.78905314 0 299.3815557
node 306 52.96270134 0 300.3663634
node 307 53.13634954 0 301.3511712
node 308 53.30999774 0 302.3359789
node 309 53.48364595 0 303.3207867
node 310 53.65729415 0 304.3055944
node 311 53.83094235 0 305.2904022
node 312 54.00459055 0 306.2752099
node 313 54.17823875 0 307.2600176
node 314 54.35188695 0 308.2448254
node 315 54.52553515 0 309.2296331
node 316 54.69918335 0 310.2144409
node 317 54.87283155 0 311.1992486
node 318 55.04647976 0 312.1840564
node 319 55.22012796 0 313.1688641
node 320 55.39377616 0 314.1536719
node 321 55.56742436 0 315.1384796
node 322 55.74107256 0 316.1232874
node 323 55.91472076 0 317.1080951
node 324 56.08836896 0 318.0929029
node 325 56.26201716 0 319.0777106
node 326 56.43566536 0 320.0625184
node 327 56.60931357 0 321.0473261
node 328 56.78296177 0 322.0321339
node 329 56.95660997 0 323.0169416
node 330 57.13025817 0 324.0017494
node 331 57.30390637 0 324.9865571
node 332 57.47755457 0 325.9713649
node 333 57.65120277 0 326.9561726
node 334 57.82485097 0 327.9409804
node 335 57.99849918 0 328.9257881
node 336 58.17214738 0 329.9105959
node 337 58.34579558 0 330.8954036
node 338 58.51944378 0 331.8802114
node 339 58.69309198 0 332.8650191
node 340 58.86674018 0 333.8498269
node 341 59.04038838 0 334.8346346
node 342 59.21403658 0 335.8194424
node 343 59.38768478 0 336.8042501
node 344 59.56133299 0 337.7890579
node 345 59.73498119 0 338.7738656
node 346 59.90862939 0 339.7586734
node 347 60.08227759 0 340.7434811
node 348 60.25592579 0 341.7282889
node 349 60.42957399 0 342.7130966
node 350 60.60322219 0 343.6979044
node 351 60.77687039 0 344.6827121
node 352 60.95051859 0 345.6675199
node 353 61.1241668 0 346.6523276
node 354 61.297815 0 347.6371354
node 355 61.4714632 0 348.6219431
node 356 61.6451114 0 349.6067509
node 357 61.8187596 0 350.5915586
node 358 61.9924078 0 351.5763663
node 359 62.166056 0 352.5611741
node 360 62.3397042 0 353.5459818
node 361 62.5133524 0 354.5307896
node 362 62.68700061 0 355.5155973
node 363 62.86064881 0 356.5004051
node 364 63.03429701 0 357.4852128
node 365 63.20794521 0 358.4700206
node 366 63.38159341 0 359.4548283
node 367 63.55524161 0 360.4396361
node 368 63.72888981 0 361.4244438
node 369 63.90253801 0 362.4092516
node 370 64.07618621 0 363.3940593
node 371 64.24983442 0 364.3788671
node 372 64.42348262 0 365.3636748
node 373 64.59713082 0 366.3484826
node 374 64.77077902 0 367.3332903
node 375 64.94442722 0 368.3180981
node 376 65.11807542 0 369.3029058
node 377 65.29172362 0 370.2877136
node 378 65.46537182 0 371.2725213
node 379 65.63902002 0 372.2573291
node 380 65.81266823 0 373.2421368
node 381 65.98631643 0 374.2269446
node 382 66.15996463 0 375.2117523
node 383 66.33361283 0 376.1965601
node 384 66.50726103 0 377.1813678
node 385 66.68090923 0 378.1661756
node 386 66.85455743 0 379.1509833
node 387 67.02820563 0 380.1357911
node 388 67.20185383 0 381.1205988
node 389 67.37550204 0 382.1054066
node 390 67.54915024 0 383.0902143
node 391 67.72279844 0 384.0750221
node 392 67.89644664 0 385.0598298
node 393 68.07009484 0 386.0446376
node 394 68.24374304 0 387.0294453
node 395 68.41739124 0 388.0142531
node 396 68.59103944 0 388.9990608
node 397 68.76468764 0 389.9838686
node 398 68.93833585 0 390.9686763
node 399 69.11198405 0 391.9534841
node 400 69.28563225 0 392.9382918
node 401 69.45928045 0 393.9230996
node 402 69.63292865 0 394.9079073
node 403 69.80657685 0 395.892715
node 404 69.98022505 0 396.8775228
node 405 70.15387325 0 397.8623305
node 406 70.32752145 0 398.8471383
node 407 70.50116966 0 399.831946
node 408 70.67481786 0 400.8167538
node 409 70.84846606 0 401.8015615
node 410 71.02211426 0 402.7863693
node 411 71.19576246 0 403.771177
node 412 71.36941066 0 404.7559848
node 413 71.54305886 0 405.7407925
node 414 71.71670706 0 406.7256003
node 415 71.89035526 0 407.710408
node 416 72.06400347 0 408.6952158
node 417 72.23765167 0 409.6800235
node 418 72.41129987 0 410.6648313
node 419 72.58494807 0 411.649639
node 420 72.75859627 0 412.6344468
node 421 72.93224447 0 413.6192545
node 422 73.10589267 0 414.6040623
node 423 73.27954087 0 415.58887
node 424 73.45318907 0 416.5736778
node 425 73.62683728 0 417.5584855
node 426 73.80048548 0 418.5432933
node 427 73.97413368 0 419.528101
node 428 74.14778188 0 420.5129088
node 429 74.32143008 0 421.4977165
node 430 74.49507828 0 422.4825243
node 431 74.66872648 0 423.467332
node 432 74.84237468 0 424.4521398
node 433 75.01602289 0 425.4369475
node 434 75.18967109 0 426.4217553
node 435 75.36331929 0 427.406563
node 436 75.53696749 0 428.3913708
node 437 75.71061569 0 429.3761785
node 438 75.88426389 0 430.3609863
node 439 76.05791209 0 431.345794
node 440 76.23156029 0 432.3306018
node 441 76.40520849 0 433.3154095
node 442 76.5788567 0 434.3002173
node 443 76.7525049 0 435.285025
node 444 76.9261531 0 436.2698328
node 445 77.0998013 0 437.2546405
node 446 77.2734495 0 438.2394482
node 447 77.4470977 0 439.224256
node 448 77.6207459 0 440.2090637
node 449 77.7943941 0 441.1938715
node 450 77.9680423 0 442.1786792
node 451 78.14169051 0 443.163487
node 452 78.31533871 0 444.1482947
node 453 78.48898691 0 445.1331025
node 454 78.66263511 0 446.1179102
node 455 78.83628331 0 447.102718
node 456 79.00993151 0 448.0875257
node 457 79.18357971 0 449.0723335
node 458 79.35722791 0 450.0571412
node 459 79.53087611 0 451.041949
node 460 79.70452432 0 452.0267567
node 461 79.87817252 0 453.0115645
node 462 80.05182072 0 453.9963722
node 463 80.22546892 0 454.98118
node 464 80.39911712 0 455.9659877
node 465 80.57276532 0 456.9507955
node 466 80.74641352 0 457.9356032
node 467 80.92006172 0 458.920411
node 468 81.09370992 0 459.9052187
node 469 81.26735813 0 460.8900265
node 470 81.44100633 0 461.8748342
node 471 81.61465453 0 462.859642
node 472 81.78830273 0 463.8444497
node 473 81.96195093 0 464.8292575
node 474 82.13559913 0 465.8140652
node 475 82.30924733 0 466.798873
node 476 82.48289553 0 467.7836807
node 477 82.65654373 0 468.7684885
node 478 82.83019194 0 469.7532962
node 479 83.00384014 0 470.738104
node 480 83.17748834 0 471.7229117
node 481 83.35113654 0 472.7077195
node 482 83.52478474 0 473.6925272
node 483 83.69843294 0 474.677335
node 484 83.87208114 0 475.6621427
node 485 84.04572934 0 476.6469505
node 486 84.21937754 0 477.6317582
node 487 84.39302575 0 478.616566
node 488 84.56667395 0 479.6013737
node 489 84.74032215 0 480.5861815
node 490 84.91397035 0 481.5709892
node 491 85.08761855 0 482.5557969
node 492 85.26126675 0 483.5406047
node 493 85.43491495 0 484.5254124
node 494 85.60856315 0 485.5102202
node 495 85.78221135 0 486.4950279
node 496 85.95585956 0 487.4798357
node 497 86.12950776 0 488.4646434
node 498 86.30315596 0 489.4494512
node 499 86.47680416 0 490.4342589
node 500 86.65045236 0 491.4190667
node 501 86.82410056 0 492.4038744
puts "Finished creating all pipe nodes..."
# create coordinate-transformation object
geomTransf Linear 1 1 0.0 0
# create fixity at pipe head (location of loading)
fix 1 1 1 1 0 0 0
#fix 1 1 1 0
for {set i 2} {$i < 501} {incr i} {
fix $i 0 1 0 0 0 0
}
fix 501 1 1 1 0 0 0
puts "Finished creating all pipe node fixities..."
# pipe section
# pipe properties
set pi [expr 4.0*atan(1.0)]
set radius 0.162
set radius2 0.1415
set area [expr $pi*$radius*$radius-$pi*$radius2*$radius2]
set I [expr $pi*$radius*$radius*$radius*$radius/4.0-$pi*$radius2*$radius2*$radius2*$radius2/4.0]
set J [expr 2.0*$I]
set E 207000000000.00000
set nu 0.30000
set G [expr $E/(2.0*(1.0+$nu))]
set nIntPts 3
set secTag 1
set secTag3D 3
# beam section, no torsion
section Elastic $secTag $E $area $I $I $G $J
# create torsional section
uniaxialMaterial Elastic 30000 1.e10
# aggregate the beam section
section Aggregator $secTag3D 30000 T -section $secTag
puts "Finished creating all beam materials..."
# create pipe elements
for {set i 1} {$i < 501} {incr i} {
element dispBeamColumn $i $i [expr $i+1] 3 $secTag3D 1
}
puts "Finished creating all pile elements..."
# create recorders
# record displacements at pipe nodes
recorder Node -file 11pipeDispz.out -time -dT 0.1 -nodeRange 1 501 -dof 3 disp
recorder Node -file 11pipeDispx.out -time -dT 0.1 -nodeRange 1 501 -dof 1 disp
puts "Finished creating all recorders..."
# real time display recorder for visualization during analysis
recorder display "OpenSees Real Time" 10 10 700 700 -wipe
prp 0 100 0
vup 0 0 1
vpn 0 -1 0
display 1 3 10
# create the loading
#gravity
pattern Plain 1 Linear {
for {set i 1} {$i <= 501} {incr i} {
load $i 0 0 -980 0 0 0
}
}
constraints Plain
numberer RCM
system BandGeneral
test NormDispIncr 1e-5 20 5
algorithm Newton
integrator LoadControl 0.01
analysis Static
analyze 100
puts "Analysis finished..."
wipe
Thanks very much!
about large deformation
Moderators: silvia, selimgunay, Moderators