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Large axial force due to offset

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yhu2007

Structural
Apr 3, 2007
3
I'm doing an bridge analysis. It is a typical deck-stringer-floorbeam-girder system. The girders are simple supported, pin on one end and roller on the other. I offset all the beams below the deck in different distance which matches the real case. The deck is connected to the stringers by rigid link. The results show large axial forces in almost all the beams. If I delete all the offset, the axial forces are gone. But I don't think it is a good way to do this because it obviously doesn't fit for the real case.

I tried to release Fy, Fz and all moments in the rigid links, the axial forces are gone, too. But I'm not sure if it is right because the moments in transverse floor beams look very small.

I read some of posts here, esp. by edward1, but didn't really understand it. Could somebody here help me with this situation? what should I do?
 
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If you model the deck using Elements and the girders using Beams with Local Member Offsets such as 0, -24, 0, you will get only shear, torsion, and moment forces. This is how MDX's program for composite forces works. I have tried several ways to model bridges and this is the best way using STAADPRO.
 
Edward,
Thanks for your reply. But I modeled the structure like you said and still got large axial forces. I'm attaching the .std file below. Could you take a look what's going on? Thanks a lot!


STAAD SPACE RMNB SPAN 4
START JOB INFORMATION
ENGINEER DATE 01-Feb-07
END JOB INFORMATION
INPUT WIDTH 79
UNIT INCHES KIP
JOINT COORDINATES
8 15 0 4; 9 300 0 4; 10 600 0 4; 11 885 0 4; 14 15 0 42; 15 300 0 42;
16 600 0 42; 17 885 0 42; 20 15 0 102; 21 300 0 102; 22 600 0 102;
23 885 0 102; 26 15 0 204; 27 300 0 204; 28 600 0 204; 29 885 0 204;
32 15 0 306; 33 300 0 306; 34 600 0 306; 35 885 0 306; 38 15 0 366;
39 300 0 366; 40 600 0 366; 41 885 0 366; 44 15 0 404; 45 300 0 404;
46 600 0 404; 47 885 0 404; 50 34 0 4; 52 53 0 4; 54 72 0 4; 56 91 0 4;
58 110 0 4; 60 129 0 4; 62 148 0 4; 64 167 0 4; 66 186 0 4; 68 205 0 4;
70 224 0 4; 72 243 0 4; 74 262 0 4; 76 281 0 4; 77 34 0 23; 78 15 0 23;
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ELEMENT INCIDENCES SHELL
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139 99 100 119 118; 140 100 101 120 119; 141 101 102 121 120;
142 102 103 122 121; 143 103 104 123 122; 144 104 105 124 123;
145 105 106 125 124; 147 106 15 126 125; 148 108 112 127 110;
149 112 113 128 127; 150 113 114 129 128; 151 114 115 130 129;
152 115 116 131 130; 153 116 117 132 131; 154 117 118 133 132;
155 118 119 134 133; 156 119 120 135 134; 157 120 121 136 135;
158 121 122 137 136; 159 122 123 138 137; 160 123 124 139 138;
161 124 125 140 139; 163 125 126 141 140; 165 110 127 142 20;
167 127 128 143 142; 169 128 129 144 143; 171 129 130 145 144;
173 130 131 146 145; 175 131 132 147 146; 177 132 133 148 147;
179 133 134 149 148; 181 134 135 150 149; 183 135 136 151 150;
185 136 137 152 151; 187 137 138 153 152; 189 138 139 154 153;
191 139 140 155 154; 192 140 141 21 155; 202 20 142 164 156;
203 142 143 165 164; 204 143 144 166 165; 205 144 145 167 166;
206 145 146 168 167; 207 146 147 169 168; 208 147 148 170 169;
209 148 149 171 170; 210 149 150 172 171; 211 150 151 173 172;
212 151 152 174 173; 213 152 153 175 174; 214 153 154 176 175;
215 154 155 177 176; 217 155 21 178 177; 218 156 164 179 158;
219 164 165 180 179; 220 165 166 181 180; 221 166 167 182 181;
222 167 168 183 182; 223 168 169 184 183; 224 169 170 185 184;
225 170 171 186 185; 226 171 172 187 186; 227 172 173 188 187;
228 173 174 189 188; 229 174 175 190 189; 230 175 176 191 190;
231 176 177 192 191; 233 177 178 193 192; 234 158 179 194 160;
235 179 180 195 194; 236 180 181 196 195; 237 181 182 197 196;
238 182 183 198 197; 239 183 184 199 198; 240 184 185 200 199;
241 185 186 201 200; 242 186 187 202 201; 243 187 188 203 202;
244 188 189 204 203; 245 189 190 205 204; 246 190 191 206 205;
247 191 192 207 206; 249 192 193 208 207; 250 160 194 209 162;
251 194 195 210 209; 252 195 196 211 210; 253 196 197 212 211;
254 197 198 213 212; 255 198 199 214 213; 256 199 200 215 214;
257 200 201 216 215; 258 201 202 217 216; 259 202 203 218 217;
260 203 204 219 218; 261 204 205 220 219; 262 205 206 221 220;
263 206 207 222 221; 265 207 208 223 222; 267 162 209 224 26;
269 209 210 225 224; 271 210 211 226 225; 273 211 212 227 226;
275 212 213 228 227; 277 213 214 229 228; 279 214 215 230 229;
281 215 216 231 230; 283 216 217 232 231; 285 217 218 233 232;
287 218 219 234 233; 289 219 220 235 234; 291 220 221 236 235;
293 221 222 237 236; 294 222 223 27 237; 310 9 239 266 92; 311 239 241 267 266;
312 241 243 268 267; 313 243 245 269 268; 314 245 247 270 269;
315 247 249 271 270; 316 249 251 272 271; 317 251 253 273 272;
318 253 255 274 273; 319 255 257 275 274; 320 257 259 276 275;
321 259 261 277 276; 322 261 263 278 277; 323 263 265 279 278;
325 265 10 280 279; 326 92 266 281 15; 327 266 267 282 281;
328 267 268 283 282; 329 268 269 284 283; 330 269 270 285 284;
331 270 271 286 285; 332 271 272 287 286; 333 272 273 288 287;
334 273 274 289 288; 335 274 275 290 289; 336 275 276 291 290;
337 276 277 292 291; 338 277 278 293 292; 339 278 279 294 293;
340 279 280 16 294; 341 15 281 295 126; 342 281 282 296 295;
343 282 283 297 296; 344 283 284 298 297; 345 284 285 299 298;
346 285 286 300 299; 347 286 287 301 300; 348 287 288 302 301;
349 288 289 303 302; 350 289 290 304 303; 351 290 291 305 304;
352 291 292 306 305; 353 292 293 307 306; 354 293 294 308 307;
356 294 16 309 308; 357 126 295 310 141; 358 295 296 311 310;
359 296 297 312 311; 360 297 298 313 312; 361 298 299 314 313;
362 299 300 315 314; 363 300 301 316 315; 364 301 302 317 316;
365 302 303 318 317; 366 303 304 319 318; 367 304 305 320 319;
368 305 306 321 320; 369 306 307 322 321; 370 307 308 323 322;
372 308 309 324 323; 374 141 310 325 21; 376 310 311 326 325;
378 311 312 327 326; 380 312 313 328 327; 382 313 314 329 328;
384 314 315 330 329; 386 315 316 331 330; 388 316 317 332 331;
390 317 318 333 332; 392 318 319 334 333; 394 319 320 335 334;
396 320 321 336 335; 398 321 322 337 336; 400 322 323 338 337;
401 323 324 22 338; 402 21 325 339 178; 403 325 326 340 339;
404 326 327 341 340; 405 327 328 342 341; 406 328 329 343 342;
407 329 330 344 343; 408 330 331 345 344; 409 331 332 346 345;
410 332 333 347 346; 411 333 334 348 347; 412 334 335 349 348;
413 335 336 350 349; 414 336 337 351 350; 415 337 338 352 351;
417 338 22 353 352; 418 178 339 354 193; 419 339 340 355 354;
420 340 341 356 355; 421 341 342 357 356; 422 342 343 358 357;
423 343 344 359 358; 424 344 345 360 359; 425 345 346 361 360;
426 346 347 362 361; 427 347 348 363 362; 428 348 349 364 363;
429 349 350 365 364; 430 350 351 366 365; 431 351 352 367 366;
433 352 353 368 367; 434 193 354 369 208; 435 354 355 370 369;
436 355 356 371 370; 437 356 357 372 371; 438 357 358 373 372;
439 358 359 374 373; 440 359 360 375 374; 441 360 361 376 375;
442 361 362 377 376; 443 362 363 378 377; 444 363 364 379 378;
445 364 365 380 379; 446 365 366 381 380; 447 366 367 382 381;
449 367 368 383 382; 450 208 369 384 223; 451 369 370 385 384;
452 370 371 386 385; 453 371 372 387 386; 454 372 373 388 387;
455 373 374 389 388; 456 374 375 390 389; 457 375 376 391 390;
458 376 377 392 391; 459 377 378 393 392; 460 378 379 394 393;
461 379 380 395 394; 462 380 381 396 395; 463 381 382 397 396;
465 382 383 398 397; 467 223 384 399 27; 469 384 385 400 399;
471 385 386 401 400; 473 386 387 402 401; 475 387 388 403 402;
477 388 389 404 403; 479 389 390 405 404; 481 390 391 406 405;
483 391 392 407 406; 485 392 393 408 407; 487 393 394 409 408;
489 394 395 410 409; 491 395 396 411 410; 493 396 397 412 411;
494 397 398 28 412; 510 10 414 441 280; 511 414 416 442 441;
512 416 418 443 442; 513 418 420 444 443; 514 420 422 445 444;
515 422 424 446 445; 516 424 426 447 446; 517 426 428 448 447;
518 428 430 449 448; 519 430 432 450 449; 520 432 434 451 450;
521 434 436 452 451; 522 436 438 453 452; 523 438 440 454 453;
525 440 11 455 454; 526 280 441 456 16; 527 441 442 457 456;
528 442 443 458 457; 529 443 444 459 458; 530 444 445 460 459;
531 445 446 461 460; 532 446 447 462 461; 533 447 448 463 462;
534 448 449 464 463; 535 449 450 465 464; 536 450 451 466 465;
537 451 452 467 466; 538 452 453 468 467; 539 453 454 469 468;
540 454 455 17 469; 541 16 456 470 309; 542 456 457 471 470;
543 457 458 472 471; 544 458 459 473 472; 545 459 460 474 473;
546 460 461 475 474; 547 461 462 476 475; 548 462 463 477 476;
549 463 464 478 477; 550 464 465 479 478; 551 465 466 480 479;
552 466 467 481 480; 553 467 468 482 481; 554 468 469 483 482;
556 469 17 484 483; 557 309 470 485 324; 558 470 471 486 485;
559 471 472 487 486; 560 472 473 488 487; 561 473 474 489 488;
562 474 475 490 489; 563 475 476 491 490; 564 476 477 492 491;
565 477 478 493 492; 566 478 479 494 493; 567 479 480 495 494;
568 480 481 496 495; 569 481 482 497 496; 570 482 483 498 497;
572 483 484 499 498; 574 324 485 500 22; 576 485 486 501 500;
578 486 487 502 501; 580 487 488 503 502; 582 488 489 504 503;
584 489 490 505 504; 586 490 491 506 505; 588 491 492 507 506;
590 492 493 508 507; 592 493 494 509 508; 594 494 495 510 509;
596 495 496 511 510; 598 496 497 512 511; 600 497 498 513 512;
601 498 499 23 513; 602 22 500 514 353; 603 500 501 515 514;
604 501 502 516 515; 605 502 503 517 516; 606 503 504 518 517;
607 504 505 519 518; 608 505 506 520 519; 609 506 507 521 520;
610 507 508 522 521; 611 508 509 523 522; 612 509 510 524 523;
613 510 511 525 524; 614 511 512 526 525; 615 512 513 527 526;
617 513 23 528 527; 618 353 514 529 368; 619 514 515 530 529;
620 515 516 531 530; 621 516 517 532 531; 622 517 518 533 532;
623 518 519 534 533; 624 519 520 535 534; 625 520 521 536 535;
626 521 522 537 536; 627 522 523 538 537; 628 523 524 539 538;
629 524 525 540 539; 630 525 526 541 540; 631 526 527 542 541;
633 527 528 543 542; 634 368 529 544 383; 635 529 530 545 544;
636 530 531 546 545; 637 531 532 547 546; 638 532 533 548 547;
639 533 534 549 548; 640 534 535 550 549; 641 535 536 551 550;
642 536 537 552 551; 643 537 538 553 552; 644 538 539 554 553;
645 539 540 555 554; 646 540 541 556 555; 647 541 542 557 556;
649 542 543 558 557; 650 383 544 559 398; 651 544 545 560 559;
652 545 546 561 560; 653 546 547 562 561; 654 547 548 563 562;
655 548 549 564 563; 656 549 550 565 564; 657 550 551 566 565;
658 551 552 567 566; 659 552 553 568 567; 660 553 554 569 568;
661 554 555 570 569; 662 555 556 571 570; 663 556 557 572 571;
665 557 558 573 572; 667 398 559 574 28; 669 559 560 575 574;
671 560 561 576 575; 673 561 562 577 576; 675 562 563 578 577;
677 563 564 579 578; 679 564 565 580 579; 681 565 566 581 580;
683 566 567 582 581; 685 567 568 583 582; 687 568 569 584 583;
689 569 570 585 584; 691 570 571 586 585; 693 571 572 587 586;
694 572 573 29 587; 723 26 224 609 595; 724 224 225 610 609;
725 225 226 611 610; 726 226 227 612 611; 727 227 228 613 612;
728 228 229 614 613; 729 229 230 615 614; 730 230 231 616 615;
731 231 232 617 616; 732 232 233 618 617; 733 233 234 619 618;
734 234 235 620 619; 735 235 236 621 620; 736 236 237 622 621;
738 237 27 623 622; 739 595 609 624 597; 740 609 610 625 624;
741 610 611 626 625; 742 611 612 627 626; 743 612 613 628 627;
744 613 614 629 628; 745 614 615 630 629; 746 615 616 631 630;
747 616 617 632 631; 748 617 618 633 632; 749 618 619 634 633;
750 619 620 635 634; 751 620 621 636 635; 752 621 622 637 636;
754 622 623 638 637; 755 597 624 639 599; 756 624 625 640 639;
757 625 626 641 640; 758 626 627 642 641; 759 627 628 643 642;
760 628 629 644 643; 761 629 630 645 644; 762 630 631 646 645;
763 631 632 647 646; 764 632 633 648 647; 765 633 634 649 648;
766 634 635 650 649; 767 635 636 651 650; 768 636 637 652 651;
770 637 638 653 652; 771 599 639 654 601; 772 639 640 655 654;
773 640 641 656 655; 774 641 642 657 656; 775 642 643 658 657;
776 643 644 659 658; 777 644 645 660 659; 778 645 646 661 660;
779 646 647 662 661; 780 647 648 663 662; 781 648 649 664 663;
782 649 650 665 664; 783 650 651 666 665; 784 651 652 667 666;
786 652 653 668 667; 788 601 654 669 32; 790 654 655 670 669;
792 655 656 671 670; 794 656 657 672 671; 796 657 658 673 672;
798 658 659 674 673; 800 659 660 675 674; 802 660 661 676 675;
804 661 662 677 676; 806 662 663 678 677; 808 663 664 679 678;
810 664 665 680 679; 812 665 666 681 680; 814 666 667 682 681;
815 667 668 33 682; 816 32 669 683 603; 817 669 670 684 683;
818 670 671 685 684; 819 671 672 686 685; 820 672 673 687 686;
821 673 674 688 687; 822 674 675 689 688; 823 675 676 690 689;
824 676 677 691 690; 825 677 678 692 691; 826 678 679 693 692;
827 679 680 694 693; 828 680 681 695 694; 829 681 682 696 695;
831 682 33 697 696; 832 603 683 698 605; 833 683 684 699 698;
834 684 685 700 699; 835 685 686 701 700; 836 686 687 702 701;
837 687 688 703 702; 838 688 689 704 703; 839 689 690 705 704;
840 690 691 706 705; 841 691 692 707 706; 842 692 693 708 707;
843 693 694 709 708; 844 694 695 710 709; 845 695 696 711 710;
847 696 697 712 711; 848 605 698 713 38; 849 698 699 714 713;
850 699 700 715 714; 851 700 701 716 715; 852 701 702 717 716;
853 702 703 718 717; 854 703 704 719 718; 855 704 705 720 719;
856 705 706 721 720; 857 706 707 722 721; 858 707 708 723 722;
859 708 709 724 723; 860 709 710 725 724; 861 710 711 726 725;
862 711 712 39 726; 863 38 713 727 607; 864 713 714 728 727;
865 714 715 729 728; 866 715 716 730 729; 867 716 717 731 730;
868 717 718 732 731; 869 718 719 733 732; 870 719 720 734 733;
871 720 721 735 734; 872 721 722 736 735; 873 722 723 737 736;
874 723 724 738 737; 875 724 725 739 738; 876 725 726 740 739;
878 726 39 741 740; 879 607 727 742 44; 880 727 728 743 742;
881 728 729 744 743; 882 729 730 745 744; 883 730 731 746 745;
884 731 732 747 746; 885 732 733 748 747; 886 733 734 749 748;
887 734 735 750 749; 888 735 736 751 750; 889 736 737 752 751;
890 737 738 753 752; 891 738 739 754 753; 892 739 740 755 754;
893 740 741 45 755; 894 27 399 756 623; 895 399 400 757 756;
896 400 401 758 757; 897 401 402 759 758; 898 402 403 760 759;
899 403 404 761 760; 900 404 405 762 761; 901 405 406 763 762;
902 406 407 764 763; 903 407 408 765 764; 904 408 409 766 765;
905 409 410 767 766; 906 410 411 768 767; 907 411 412 769 768;
909 412 28 770 769; 910 623 756 771 638; 911 756 757 772 771;
912 757 758 773 772; 913 758 759 774 773; 914 759 760 775 774;
915 760 761 776 775; 916 761 762 777 776; 917 762 763 778 777;
918 763 764 779 778; 919 764 765 780 779; 920 765 766 781 780;
921 766 767 782 781; 922 767 768 783 782; 923 768 769 784 783;
925 769 770 785 784; 926 638 771 786 653; 927 771 772 787 786;
928 772 773 788 787; 929 773 774 789 788; 930 774 775 790 789;
931 775 776 791 790; 932 776 777 792 791; 933 777 778 793 792;
934 778 779 794 793; 935 779 780 795 794; 936 780 781 796 795;
937 781 782 797 796; 938 782 783 798 797; 939 783 784 799 798;
941 784 785 800 799; 942 653 786 801 668; 943 786 787 802 801;
944 787 788 803 802; 945 788 789 804 803; 946 789 790 805 804;
947 790 791 806 805; 948 791 792 807 806; 949 792 793 808 807;
950 793 794 809 808; 951 794 795 810 809; 952 795 796 811 810;
953 796 797 812 811; 954 797 798 813 812; 955 798 799 814 813;
957 799 800 815 814; 959 668 801 816 33; 961 801 802 817 816;
963 802 803 818 817; 965 803 804 819 818; 967 804 805 820 819;
969 805 806 821 820; 971 806 807 822 821; 973 807 808 823 822;
975 808 809 824 823; 977 809 810 825 824; 979 810 811 826 825;
981 811 812 827 826; 983 812 813 828 827; 985 813 814 829 828;
986 814 815 34 829; 987 33 816 830 697; 988 816 817 831 830;
989 817 818 832 831; 990 818 819 833 832; 991 819 820 834 833;
992 820 821 835 834; 993 821 822 836 835; 994 822 823 837 836;
995 823 824 838 837; 996 824 825 839 838; 997 825 826 840 839;
998 826 827 841 840; 999 827 828 842 841; 1000 828 829 843 842;
1002 829 34 844 843; 1003 697 830 845 712; 1004 830 831 846 845;
1005 831 832 847 846; 1006 832 833 848 847; 1007 833 834 849 848;
1008 834 835 850 849; 1009 835 836 851 850; 1010 836 837 852 851;
1011 837 838 853 852; 1012 838 839 854 853; 1013 839 840 855 854;
1014 840 841 856 855; 1015 841 842 857 856; 1016 842 843 858 857;
1018 843 844 859 858; 1019 712 845 860 39; 1020 845 846 861 860;
1021 846 847 862 861; 1022 847 848 863 862; 1023 848 849 864 863;
1024 849 850 865 864; 1025 850 851 866 865; 1026 851 852 867 866;
1027 852 853 868 867; 1028 853 854 869 868; 1029 854 855 870 869;
1030 855 856 871 870; 1031 856 857 872 871; 1032 857 858 873 872;
1033 858 859 40 873; 1034 39 860 874 741; 1035 860 861 875 874;
1036 861 862 876 875; 1037 862 863 877 876; 1038 863 864 878 877;
1039 864 865 879 878; 1040 865 866 880 879; 1041 866 867 881 880;
1042 867 868 882 881; 1043 868 869 883 882; 1044 869 870 884 883;
1045 870 871 885 884; 1046 871 872 886 885; 1047 872 873 887 886;
1049 873 40 888 887; 1050 741 874 889 45; 1051 874 875 890 889;
1052 875 876 891 890; 1053 876 877 892 891; 1054 877 878 893 892;
1055 878 879 894 893; 1056 879 880 895 894; 1057 880 881 896 895;
1058 881 882 897 896; 1059 882 883 898 897; 1060 883 884 899 898;
1061 884 885 900 899; 1062 885 886 901 900; 1063 886 887 902 901;
1064 887 888 46 902; 1065 28 574 903 770; 1066 574 575 904 903;
1067 575 576 905 904; 1068 576 577 906 905; 1069 577 578 907 906;
1070 578 579 908 907; 1071 579 580 909 908; 1072 580 581 910 909;
1073 581 582 911 910; 1074 582 583 912 911; 1075 583 584 913 912;
1076 584 585 914 913; 1077 585 586 915 914; 1078 586 587 916 915;
1080 587 29 917 916; 1081 770 903 918 785; 1082 903 904 919 918;
1083 904 905 920 919; 1084 905 906 921 920; 1085 906 907 922 921;
1086 907 908 923 922; 1087 908 909 924 923; 1088 909 910 925 924;
1089 910 911 926 925; 1090 911 912 927 926; 1091 912 913 928 927;
1092 913 914 929 928; 1093 914 915 930 929; 1094 915 916 931 930;
1096 916 917 932 931; 1097 785 918 933 800; 1098 918 919 934 933;
1099 919 920 935 934; 1100 920 921 936 935; 1101 921 922 937 936;
1102 922 923 938 937; 1103 923 924 939 938; 1104 924 925 940 939;
1105 925 926 941 940; 1106 926 927 942 941; 1107 927 928 943 942;
1108 928 929 944 943; 1109 929 930 945 944; 1110 930 931 946 945;
1112 931 932 947 946; 1113 800 933 948 815; 1114 933 934 949 948;
1115 934 935 950 949; 1116 935 936 951 950; 1117 936 937 952 951;
1118 937 938 953 952; 1119 938 939 954 953; 1120 939 940 955 954;
1121 940 941 956 955; 1122 941 942 957 956; 1123 942 943 958 957;
1124 943 944 959 958; 1125 944 945 960 959; 1126 945 946 961 960;
1128 946 947 962 961; 1130 815 948 963 34; 1132 948 949 964 963;
1134 949 950 965 964; 1136 950 951 966 965; 1138 951 952 967 966;
1140 952 953 968 967; 1142 953 954 969 968; 1144 954 955 970 969;
1146 955 956 971 970; 1148 956 957 972 971; 1150 957 958 973 972;
1152 958 959 974 973; 1154 959 960 975 974; 1156 960 961 976 975;
1157 961 962 35 976; 1158 34 963 977 844; 1159 963 964 978 977;
1160 964 965 979 978; 1161 965 966 980 979; 1162 966 967 981 980;
1163 967 968 982 981; 1164 968 969 983 982; 1165 969 970 984 983;
1166 970 971 985 984; 1167 971 972 986 985; 1168 972 973 987 986;
1169 973 974 988 987; 1170 974 975 989 988; 1171 975 976 990 989;
1173 976 35 991 990; 1174 844 977 992 859; 1175 977 978 993 992;
1176 978 979 994 993; 1177 979 980 995 994; 1178 980 981 996 995;
1179 981 982 997 996; 1180 982 983 998 997; 1181 983 984 999 998;
1182 984 985 1000 999; 1183 985 986 1001 1000; 1184 986 987 1002 1001;
1185 987 988 1003 1002; 1186 988 989 1004 1003; 1187 989 990 1005 1004;
1189 990 991 1006 1005; 1190 859 992 1007 40; 1191 992 993 1008 1007;
1192 993 994 1009 1008; 1193 994 995 1010 1009; 1194 995 996 1011 1010;
1195 996 997 1012 1011; 1196 997 998 1013 1012; 1197 998 999 1014 1013;
1198 999 1000 1015 1014; 1199 1000 1001 1016 1015; 1200 1001 1002 1017 1016;
1201 1002 1003 1018 1017; 1202 1003 1004 1019 1018; 1203 1004 1005 1020 1019;
1204 1005 1006 41 1020; 1205 40 1007 1021 888; 1206 1007 1008 1022 1021;
1207 1008 1009 1023 1022; 1208 1009 1010 1024 1023; 1209 1010 1011 1025 1024;
1210 1011 1012 1026 1025; 1211 1012 1013 1027 1026; 1212 1013 1014 1028 1027;
1213 1014 1015 1029 1028; 1214 1015 1016 1030 1029; 1215 1016 1017 1031 1030;
1216 1017 1018 1032 1031; 1217 1018 1019 1033 1032; 1218 1019 1020 1034 1033;
1220 1020 41 1035 1034; 1221 888 1021 1036 46; 1222 1021 1022 1037 1036;
1223 1022 1023 1038 1037; 1224 1023 1024 1039 1038; 1225 1024 1025 1040 1039;
1226 1025 1026 1041 1040; 1227 1026 1027 1042 1041; 1228 1027 1028 1043 1042;
1229 1028 1029 1044 1043; 1230 1029 1030 1045 1044; 1231 1030 1031 1046 1045;
1232 1031 1032 1047 1046; 1233 1032 1033 1048 1047; 1234 1033 1034 1049 1048;
1235 1034 1035 47 1049;
START USER TABLE
TABLE 1
UNIT INCHES KIP
PRISMATIC
FG_F'-F'
744.39 331398 19747.3 21860.5 442.52 338.49 60 28
IG_F'-F'
744.39 331398 19747.3 21860.5 442.52 338.49 60 28
ID_A-A
416.31 67347.8 2742.37 10692 416.31 416.31 44 9
ID_B-B
416.31 66513.3 2706.63 10692 416.31 416.31 44 9
ED_
244.43 18714.9 1287.93 5120 244.43 244.43 30 8
END
UNIT FEET KIP
ELEMENT PROPERTY
94 TO 107 109 TO 124 132 TO 145 147 TO 161 163 165 167 169 171 173 175 177 -
179 181 183 185 187 189 191 192 202 TO 215 217 TO 231 233 TO 247 249 TO 263 -
265 267 269 271 273 275 277 279 281 283 285 287 289 291 293 294 310 TO 323 -
325 TO 354 356 TO 370 372 374 376 378 380 382 384 386 388 390 392 394 396 -
398 400 TO 415 417 TO 431 433 TO 447 449 TO 463 465 467 469 471 473 475 477 -
479 481 483 485 487 489 491 493 494 510 TO 523 525 TO 554 556 TO 570 572 -
574 576 578 580 582 584 586 588 590 592 594 596 598 600 TO 615 617 TO 631 -
633 TO 647 649 TO 663 665 667 669 671 673 675 677 679 681 683 685 687 689 -
691 693 694 723 TO 736 738 TO 752 754 TO 768 770 TO 784 786 788 790 792 794 -
796 798 800 802 804 806 808 810 812 814 TO 829 831 TO 845 847 TO 876 878 -
879 TO 907 909 TO 923 925 TO 939 941 TO 955 957 959 961 963 965 967 969 971 -
973 975 977 979 981 983 985 TO 1000 1002 TO 1016 1018 TO 1047 1049 TO 1078 -
1080 TO 1094 1096 TO 1110 1112 TO 1126 1128 1130 1132 1134 1136 1138 1140 -
1142 1144 1146 1148 1150 1152 1154 1156 TO 1171 1173 TO 1187 1189 TO 1218 -
1220 TO 1235 THICKNESS 0.583333
DEFINE MATERIAL START
ISOTROPIC DECKCONC
E 453600
POISSON 0.17
DENSITY 0.15
ALPHA 5.5e-006
DAMP 0.05
ISOTROPIC WETDECK
E 2
POISSON 0.17
DENSITY 0.14999
ALPHA 5.5e-006
DAMP 0.05
ISOTROPIC BEAMCONC
E 617328
POISSON 0.17
DENSITY 0.14999
ALPHA 5.5e-006
DAMP 0.05
ISOTROPIC PSDIACONC
E 617328
POISSON 0.17
DENSITY 0.15
ALPHA 5.5e-006
DAMP 0.05
ISOTROPIC RFDIACONC
E 453600
POISSON 0.17
DENSITY 0.15
ALPHA 5.5e-006
DAMP 0.05
ISOTROPIC STEEL
E 4.176e+006
POISSON 0.3
DENSITY 0.489024
ALPHA 6.5e-006
DAMP 0.03
ISOTROPIC CONCRETE
E 453600
POISSON 0.17
DENSITY 0.14999
ALPHA 5.5e-006
DAMP 0.05
END DEFINE MATERIAL
UNIT INCHES KIP
MEMBER PROPERTY AMERICAN
16 19 21 24 27 29 32 35 37 164 166 168 170 172 174 176 178 180 182 184 186 -
188 190 266 268 270 272 274 276 278 280 282 284 286 288 290 292 373 375 377 -
379 381 383 385 387 389 391 393 395 397 399 466 468 470 472 474 476 478 480 -
482 484 486 488 490 492 573 575 577 579 581 583 585 587 589 591 593 595 597 -
599 666 668 670 672 674 676 678 680 682 684 686 688 690 692 787 789 791 793 -
795 797 799 801 803 805 807 809 811 813 958 960 962 964 966 968 970 972 974 -
976 978 980 982 984 1129 1131 1133 1135 1137 1139 1141 1143 1145 1147 1149 -
1151 1153 1155 TABLE ST W30X173
CONSTANTS
MATERIAL STEEL MEMB 16 19 21 24 27 29 32 35 37 164 166 168 170 172 174 176 -
178 180 182 184 186 188 190 266 268 270 272 274 276 278 280 282 284 286 288 -
290 292 373 375 377 379 381 383 385 387 389 391 393 395 397 399 466 468 470 -
472 474 476 478 480 482 484 486 488 490 492 573 575 577 579 581 583 585 587 -
589 591 593 595 597 599 666 668 670 672 674 676 678 680 682 684 686 688 690 -
692 787 789 791 793 795 797 799 801 803 805 807 809 811 813 958 960 962 964 -
966 968 970 972 974 976 978 980 982 984 1129 1131 1133 1135 1137 1139 1141 -
1143 1145 1147 1149 1151 1153 1155
MATERIAL CONCRETE MEMB 94 TO 107 109 TO 124 132 TO 145 147 TO 161 163 165 -
167 169 171 173 175 177 179 181 183 185 187 189 191 192 202 TO 215 -
217 TO 231 233 TO 247 249 TO 263 265 267 269 271 273 275 277 279 281 283 -
285 287 289 291 293 294 310 TO 323 325 TO 354 356 TO 370 372 374 376 378 -
380 382 384 386 388 390 392 394 396 398 400 TO 415 417 TO 431 433 TO 447 -
449 TO 463 465 467 469 471 473 475 477 479 481 483 485 487 489 491 493 494 -
510 TO 523 525 TO 554 556 TO 570 572 574 576 578 580 582 584 586 588 590 -
592 594 596 598 600 TO 615 617 TO 631 633 TO 647 649 TO 663 665 667 669 671 -
673 675 677 679 681 683 685 687 689 691 693 694 723 TO 736 738 TO 752 754 -
755 TO 768 770 TO 784 786 788 790 792 794 796 798 800 802 804 806 808 810 -
812 814 TO 829 831 TO 845 847 TO 876 878 TO 907 909 TO 923 925 TO 939 941 -
942 TO 955 957 959 961 963 965 967 969 971 973 975 977 979 981 983 -
985 TO 1000 1002 TO 1016 1018 TO 1047 1049 TO 1078 1080 TO 1094 1096 TO 1110 -
1112 TO 1126 1128 1130 1132 1134 1136 1138 1140 1142 1144 1146 1148 1150 -
1152 1154 1156 TO 1171 1173 TO 1187 1189 TO 1218 1220 TO 1235
SUPPORTS
20 26 32 PINNED
23 29 35 ENFORCED BUT FX MX MY MZ
MEMBER OFFSET
16 19 21 24 27 29 32 35 37 164 166 168 170 172 174 176 178 180 182 184 186 -
188 190 266 268 270 272 274 276 278 280 282 284 286 288 290 292 373 375 377 -
379 381 383 385 387 389 391 393 395 397 399 466 468 470 472 474 476 478 480 -
482 484 486 488 490 492 573 575 577 579 581 583 585 587 589 591 593 595 597 -
599 666 668 670 672 674 676 678 680 682 684 686 688 690 692 787 789 791 793 -
795 797 799 801 803 805 807 809 811 813 958 960 962 964 966 968 970 972 974 -
976 978 980 982 984 1129 1131 1133 1135 1137 1139 1141 1143 1145 1147 1149 -
1151 1153 1155 START LOCAL 0 -18.72 0
16 19 21 24 27 29 32 35 37 164 166 168 170 172 174 176 178 180 182 184 186 -
188 190 266 268 270 272 274 276 278 280 282 284 286 288 290 292 373 375 377 -
379 381 383 385 387 389 391 393 395 397 399 466 468 470 472 474 476 478 480 -
482 484 486 488 490 492 573 575 577 579 581 583 585 587 589 591 593 595 597 -
599 666 668 670 672 674 676 678 680 682 684 686 688 690 692 787 789 791 793 -
795 797 799 801 803 805 807 809 811 813 958 960 962 964 966 968 970 972 974 -
976 978 980 982 984 1129 1131 1133 1135 1137 1139 1141 1143 1145 1147 1149 -
1151 1153 1155 END LOCAL 0 -18.72 0
UNIT FEET KIP
LOAD 1 LOADTYPE Dead TITLE SELFWEIGHT
SELFWEIGHT Y -1
PERFORM ANALYSIS
FINISH
 
I think you need to release the supports at the ends of the bridge in the Z direction and use spring constants of at least 1E3 in kip feet at one pier support. Don't restrict the longitudinal expansion of the bridge.
 
yhu2007
I recommend that you go to MDX Software web page and download a free trial of their girder design program. If you will run this software with the finite element option, I think you will get what you need.
 
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