Can anyone help?
I have modelled a structure which is being transported on a trailer. The structure is restrained by chains which are indicated by tension only members in the model. When I analyse the model I get an instability at joint 91. Can anyone explain why and how to resolve the issue? Here is the input file.
STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 10-10-16
JOB NAME
JOB CLIENT
JOB NO
ENGINEER NAME
CHECKER NAME
APPROVED NAME
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 5.96 0 0; 3 5.96 0 4.5; 4 0 0 4.5; 5 0 0.3 0; 6 2.5 0.3 0;
7 4.06 0.3 0; 8 5.96 0.3 0; 9 0 0.3 1.075; 10 2.5 0.3 1.075; 11 4.06 0.3 1.075;
12 5.96 0.3 1.075; 13 0 0.3 2.25; 14 2.5 0.3 2.25; 15 4.06 0.3 2.25;
16 5.96 0.3 2.25; 17 0 0.3 3.425; 18 2.5 0.3 3.425; 19 4.06 0.3 3.425;
20 5.96 0.3 3.425; 21 0 0.3 4.5; 22 2.5 0.3 4.5; 23 4.06 0.3 4.5;
24 5.96 0.3 4.5; 27 2.5 1.75 0; 28 5.96 1.75 0; 29 5.96 1.75 4.5;
30 2.5 1.75 4.5; 31 0 2.11 0; 32 2.5 2.11 0; 33 4.06 2.11 0; 34 5.96 2.11 0;
36 0 2.11 4.5; 37 2.5 2.11 4.5; 38 4.06 2.11 4.5; 39 5.96 2.11 4.5;
56 6.32 0.3 0; 57 6.32 0.3 4.5; 58 6.32 2.11 0; 59 6.32 2.11 4.5; 60 6.68 0 0;
61 12.64 0 0; 62 12.64 0 4.5; 63 6.68 0 4.5; 64 6.68 0.3 0; 65 8.97 0.3 0;
66 11.39 0.3 0; 67 12.64 0.3 0; 68 6.68 0.3 4.5; 69 8.97 0.3 4.5;
70 11.39 0.3 4.5; 71 12.64 0.3 4.5; 72 6.68 0.3 1.075; 73 8.97 0.3 1.075;
74 11.39 0.3 1.075; 75 12.64 0.3 1.075; 76 6.68 0.3 2.25; 77 8.97 0.3 2.25;
81 8.97 0.3 3.425; 82 11.39 0.3 3.425; 83 12.64 0.3 3.425; 84 6.68 1.75 0;
85 8.97 1.75 0; 86 6.68 1.75 4.5; 87 8.97 1.75 4.5; 88 12.64 1.75 4.5;
89 6.68 2.11 0; 90 8.97 2.11 0; 91 11.39 2.11 0; 92 12.64 2.11 0;
93 6.68 2.11 4.5; 94 8.97 2.11 4.5; 95 11.39 2.11 4.5; 96 12.64 2.11 4.5;
97 6.32 0.3 1.075; 98 6.32 0.3 2.25; 99 6.32 0.3 3.425; 100 8.75 2.11 0;
101 8.75 2.11 4.5; 102 9.22 2.11 0; 103 9.22 2.11 4.5; 104 11.39 1.75 0;
105 11.39 1.75 4.5; 354 3.75 0.3 0; 395 0 2.11 2.25; 400 5.96 1.75 1.5;
401 5.96 1.75 3; 402 2.5 1.75 1.5; 403 2.5 1.75 3; 404 3.719 1.75 1.585;
405 4.757 1.75 2.936; 406 6.68 0.3 3.425; 407 11.39 0.3 2.25;
408 12.64 0.3 2.25; 411 6.68 1.75 1.5; 412 6.68 1.75 3; 413 8.97 1.75 1.5;
414 8.97 1.75 3; 415 11.39 1.75 1.5; 416 11.39 1.75 3; 417 7.494 1.75 2.9;
418 8.183 1.75 1.547; 419 9.819 1.75 1.577; 420 10.588 1.75 3.009;
421 -0.250005 0.0999992 1; 422 -0.250005 0.0999992 3.5; 423 13.14 0.0999992 1;
424 13.14 0.0999996 3.5; 425 0 0.3 1.25; 426 0 0.3 3.25; 427 12.64 0.3 1.25;
428 5.96 0.3 3.25; 429 12.64 0.3 3.25; 430 6.68 0.3 3.25; 431 5.96 0.3 1.25;
432 6.68 0.3 1.25; 433 11.745 0.3 0; 434 11.745 0.3 4.5; 435 11.745 2.11 0;
436 11.745 2.11 4.5;
MEMBER INCIDENCES
1 1 5; 2 2 8; 3 4 21; 4 3 24; 5 5 6; 6 6 354; 7 7 8; 8 8 12; 9 12 431;
10 16 428; 11 20 24; 12 24 23; 13 22 23; 14 21 22; 15 21 17; 16 17 426;
17 13 425; 18 9 5; 19 10 6; 20 10 14; 21 14 18; 22 22 18; 23 11 7; 24 11 15;
25 15 19; 26 23 19; 27 9 10; 28 10 11; 29 11 12; 30 13 14; 31 14 15; 32 15 16;
33 17 18; 34 18 19; 35 19 20; 36 6 11; 37 11 14; 38 14 19; 39 22 19; 40 17 22;
41 19 24; 44 5 31; 45 27 6; 46 32 27; 47 33 7; 48 8 28; 49 28 34; 50 21 36;
51 30 22; 52 37 30; 53 38 23; 54 24 29; 55 29 39; 56 27 402; 57 27 404;
58 28 400; 59 31 32; 60 32 33; 61 33 34; 63 36 37; 64 37 38; 65 38 39;
67 31 395; 68 36 32; 69 6 31; 70 34 7; 71 22 36; 72 39 23; 646 354 7;
703 395 36; 704 13 395; 709 400 401; 710 401 29; 711 402 403; 712 403 30;
713 404 405; 714 405 29; 715 24 57; 716 57 68; 717 68 69; 718 69 70;
719 70 434; 720 8 56; 721 56 64; 722 64 65; 723 65 66; 724 66 433; 725 67 75;
726 75 427; 727 83 71; 728 63 68; 729 68 86; 730 86 93; 731 60 64; 732 64 84;
733 84 89; 734 62 71; 735 71 88; 736 88 96; 737 61 67; 738 67 92; 739 39 59;
740 59 93; 741 93 101; 742 101 94; 743 103 95; 744 95 436; 745 34 58;
746 58 89; 747 89 100; 748 100 90; 749 90 102; 750 102 91; 751 91 435;
752 92 96; 753 94 103; 754 69 87; 755 87 94; 756 65 85; 757 85 90; 758 70 105;
759 105 95; 760 66 104; 761 104 91; 762 64 72; 763 72 432; 764 76 430;
765 406 68; 766 65 73; 767 73 77; 768 77 81; 769 81 69; 770 66 74; 771 74 407;
772 407 82; 773 82 70; 774 72 73; 775 73 74; 776 74 75; 777 76 77; 778 407 408;
779 406 81; 780 81 82; 781 82 83; 782 408 429; 783 12 97; 784 97 72; 785 16 98;
786 98 76; 787 20 99; 788 99 406; 789 84 411; 790 85 413; 791 104 415;
792 86 417; 793 85 419; 794 67 74; 795 74 408; 796 408 82; 797 82 71;
798 82 69; 799 69 406; 800 89 65; 801 65 91; 802 66 92; 803 93 69; 804 69 95;
805 70 96; 810 411 412; 811 412 86; 812 413 414; 813 414 87; 814 415 416;
815 416 105; 816 417 418; 817 418 85; 818 419 420; 819 420 105; 820 421 6;
821 422 22; 822 66 423; 823 70 424; 824 425 9; 825 426 13; 826 427 408;
827 428 20; 828 429 83; 829 430 406; 830 431 16; 831 432 76; 832 433 67;
833 434 71; 834 435 92; 835 436 96;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 2.05e+008
POISSON 0.3
DENSITY 76.8195
ALPHA 1.2e-005
DAMP 0.03
TYPE STEEL
STRENGTH FY 253200 FU 407800 RY 1.5 RT 1.2
ISOTROPIC STAINLESSSTEEL
E 1.9793e+008
POISSON 0.3
DENSITY 76.8195
ALPHA 1.8e-005
DAMP 0.03
ISOTROPIC CONCRETE
E 2.17184e+007
POISSON 0.17
DENSITY 23.6158
ALPHA 5e-006
DAMP 0.05
TYPE CONCRETE
STRENGTH FCU 27578.9
END DEFINE MATERIAL
MEMBER PROPERTY BRITISH
1 TO 4 8 TO 11 15 TO 18 44 48 TO 50 54 55 59 TO 61 63 TO 65 67 703 -
725 TO 753 762 TO 765 782 824 TO 831 834 835 TABLE ST UC305X305X97
5 TO 7 12 TO 14 19 TO 26 646 715 TO 724 766 TO 773 832 -
833 TABLE ST UB305X165X54
27 TO 35 56 58 709 TO 712 774 TO 781 783 TO 791 810 TO 814 -
815 TABLE ST UB203X133X25
36 TO 41 57 68 TO 72 713 714 792 TO 805 816 TO 819 TABLE ST PIP1146.3
45 TO 47 51 TO 53 704 754 TO 761 TABLE ST UB305X165X46
MEMBER PROPERTY BRITISH
820 TO 823 PRIS YD 0.05
CONSTANTS
BETA 0 MEMB 14 36 60
BETA 90 MEMB 1 TO 4 44 TO 55 728 TO 738 754 TO 761
MATERIAL STEEL ALL
MEMBER RELEASE
68 714 817 819 END MY MZ
57 68 792 793 START MX MY MZ
SPRING COMPRESSION
425 TO 432 KFY
SPRING COMPRESSION
13 16 76 408 KFY
SUPPORTS
421 TO 424 FIXED
425 TO 432 FIXED BUT FX FZ MX MY MZ KFY 20000
13 16 76 408 FIXED BUT FX FZ MX MY MZ KFY 1e+014
MEMBER TENSION
820 TO 823
SET ITERLIM 20
DEFINE REFERENCE LOADS
*****************************************************
LOAD R1 LOADTYPE Dead TITLE SELFWEIGHT
SELFWEIGHT Y -1
*****************************************************
LOAD R2 LOADTYPE Dead TITLE DEAD LOADING LINER PLATE FLOORS WEATHERPOOFING
MEMBER LOAD
48 49 54 55 UNI GY -0.7
729 730 732 733 UNI GY -0.8
47 53 UNI GY -0.9
45 46 51 52 UNI GY -1
44 50 UNI GY -1.2
704 UNI GY -1.3
758 TO 761 UNI GY -1
754 TO 757 UNI GY -1.2
735 736 738 UNI GY -1.5
****************************************
MEMBER LOAD
5 TO 7 12 TO 14 646 UNI GY -0.3
27 TO 35 UNI GY -0.65
715 TO 724 775 780 832 833 UNI GY -0.3
774 776 TO 779 781 783 TO 788 UNI GY -0.65
JOINT LOAD
433 TO 436 FY -4.6
*****************************************************
LOAD R3 LOADTYPE Dead TITLE MECHANICAL PERMANENT PLANT LOADING
MEMBER LOAD
28 34 CON GY -3 1.2
29 35 CON GY -3 1.45
29 35 CON GY -3 1.75
27 33 CON GY -7 0.375
27 33 CON GY -7 2.075
774 779 CON GY -3 0.15
774 779 CON GY -3 0.45
774 779 CON GY -3 1.75
775 780 CON GY -3 0.7
776 781 CON GY -3 0.2
776 781 CON GY -1 0.6
776 781 CON GX -2 0.6
**********************************
MEMBER LOAD
5 TO 7 12 TO 14 646 UNI GY -0.3
MEMBER LOAD
767 CON GY -1.5 0.075
768 CON GY -1.5 1.1
771 CON GY -1.5 0.075
772 CON GY -1.5 1.1
777 CON GY -1.5 0.625
***************************
MEMBER LOAD
776 778 781 CON GY -6 0.6
833 CON GY -3 0.244999
832 CON GY -3 0.244999
MEMBER LOAD
715 TO 724 832 833 UNI GY -0.3
*****************************************************
LOAD R4 LOADTYPE Dead TITLE ACCELERATION N-S DEAD
SELFWEIGHT X 1
MEMBER LOAD
48 49 54 55 UNI GX 0.7
729 730 732 733 UNI GX 0.8
47 53 UNI GX 0.9
45 46 51 52 UNI GX 1
44 50 UNI GX 1.2
704 UNI GX 1.3
758 TO 761 UNI GX 1
754 TO 757 UNI GX 1.2
735 736 738 UNI GX 1.5
MEMBER LOAD
5 TO 7 12 TO 14 646 UNI GX 0.3
27 TO 35 UNI GX 0.65
715 TO 724 775 780 832 833 UNI GX 0.3
774 776 TO 779 781 783 TO 788 UNI GX 0.65
JOINT LOAD
433 TO 436 FX 4.6
******************************************
LOAD R5 LOADTYPE Dead TITLE ACCELERATION N-S PLANT
MEMBER LOAD
28 34 CON GX 3 1.2
29 35 CON GX 3 1.45
29 35 CON GX 3 1.75
27 33 CON GX 7 0.375
27 33 CON GX 7 2.075
774 779 CON GX 3 0.15
774 779 CON GX 3 0.45
774 779 CON GX 3 1.75
775 780 CON GX 3 0.7
776 781 CON GX 3 0.2
776 781 CON GX 1 0.6
776 781 CON GX 2 0.6
MEMBER LOAD
5 TO 7 12 TO 14 646 UNI GX 0.3
MEMBER LOAD
767 CON GX 1.5 0.075
768 CON GX 1.5 1.1
771 CON GX 1.5 0.075
772 CON GX 1.5 1.1
777 CON GX 1.5 0.625
MEMBER LOAD
776 778 781 CON GX 6 0.6
833 CON GX 3 0.244999
832 CON GX 3 0.244999
MEMBER LOAD
715 TO 724 832 833 UNI GX 0.3
*****************************************************
LOAD R6 LOADTYPE Dead TITLE ACCELERATION E-W DEAD
SELFWEIGHT Z 1
MEMBER LOAD
48 49 54 55 UNI GZ 0.7
729 730 732 733 UNI GZ 0.8
47 53 UNI GZ 0.9
45 46 51 52 UNI GZ 1
44 50 UNI GZ 1.2
704 UNI GZ 1.3
758 TO 761 UNI GZ 1
754 TO 757 UNI GZ 1.2
735 736 738 UNI GZ 1.5
MEMBER LOAD
5 TO 7 12 TO 14 646 UNI GZ 0.3
27 TO 35 UNI GZ 0.65
715 TO 724 775 780 832 833 UNI GZ 0.3
774 776 TO 779 781 783 TO 788 UNI GZ 0.65
JOINT LOAD
433 TO 436 FZ 4.6
******************************************
LOAD R7 LOADTYPE Dead TITLE ACCELERATION E-W PLANT
MEMBER LOAD
28 34 CON GZ 3 1.2
29 35 CON GZ 3 1.45
29 35 CON GZ 3 1.75
27 33 CON GZ 7 0.375
27 33 CON GZ 7 2.075
774 779 CON GZ 3 0.15
774 779 CON GZ 3 0.45
774 779 CON GZ 3 1.75
775 780 CON GZ 3 0.7
776 781 CON GZ 3 0.2
776 781 CON GZ 1 0.6
776 781 CON GZ 2 0.6
MEMBER LOAD
5 TO 7 12 TO 14 646 UNI GZ 0.3
MEMBER LOAD
767 CON GZ 1.5 0.075
768 CON GZ 1.5 1.1
771 CON GZ 1.5 0.075
772 CON GZ 1.5 1.1
777 CON GZ 1.5 0.625
MEMBER LOAD
776 778 781 CON GZ 6 0.6
833 CON GZ 3 0.244999
832 CON GZ 3 0.244999
MEMBER LOAD
715 TO 724 832 833 UNI GZ 0.3
******************************************
**RESISTANCE PROVIDED BY RUBBER MAT BASED ON 1.0G**
LOAD R8 LOADTYPE Dead TITLE FRICTION RESIST N-S SELF WEIGHT
JOINT LOAD
13 FX -28.1
16 FX -22.3
76 FX -21.8
408 FX -24.9
425 FX -1.5
426 FX -2.1
427 FX -3.5
428 FX -3.5
429 FX -4.3
430 FX -3.7
431 FX -2.8
432 FX -2.9
******************************************
**RESISTANCE PROVIDED BY RUBBER MAT BASED ON 1.0G**
LOAD R9 LOADTYPE Dead TITLE FRICTION RESIST N-S DEAD
JOINT LOAD
13 FX -13.8
16 FX -12.4
76 FX -14.5
408 FX -21.9
425 FX -0.8
426 FX -0.8
427 FX -3.7
428 FX -1.8
429 FX -3.6
430 FX -2.1
431 FX -1.8
432 FX -2.1
******************************************
**RESISTANCE PROVIDED BY RUBBER MAT BASED ON 1.0G**
LOAD R10 LOADTYPE Dead TITLE FRICTION RESIST N-S PLANT
JOINT LOAD
13 FX -22.4
16 FX -17.6
76 FX -24.7
408 FX -29.6
425 FX -1.7
426 FX -1.5
427 FX -4
428 FX -2.6
429 FX -4.2
430 FX -3
431 FX -2.6
432 FX -3
******************************************
**RESISTANCE PROVIDED BY RUBBER MAT BASED ON 1.0G**
LOAD R11 LOADTYPE Dead TITLE FRICTION RESIST E-W SELF WEIGHT
JOINT LOAD
13 FZ -28.1
16 FZ -22.3
76 FZ -21.8
408 FZ -24.9
425 FZ -1.5
426 FZ -2.1
427 FZ -3.5
428 FZ -3.5
429 FZ -4.3
430 FZ -3.7
431 FZ -2.8
432 FZ -2.9
******************************************
**RESISTANCE PROVIDED BY RUBBER MAT BASED ON 1.0G**
LOAD R12 LOADTYPE Dead TITLE FRICTION RESIST E-W DEAD
JOINT LOAD
13 FZ -13.8
16 FZ -12.4
76 FZ -14.5
408 FZ -21.9
425 FZ -0.8
426 FZ -0.8
427 FZ -3.7
428 FZ -1.8
429 FZ -3.6
430 FZ -2.1
431 FZ -1.8
432 FZ -2.1
******************************************
**RESISTANCE PROVIDED BY RUBBER MAT BASED ON 1.0G**
LOAD R13 LOADTYPE Dead TITLE FRICTION RESIST E-W PLANT
JOINT LOAD
13 FZ -22.4
16 FZ -17.6
76 FZ -24.7
408 FZ -29.6
425 FZ -1.7
426 FZ -1.5
427 FZ -4
428 FZ -2.6
429 FZ -4.2
430 FZ -3
431 FZ -2.6
432 FZ -3
END DEFINE REFERENCE LOADS
LOAD 20 LOADTYPE Traffic TITLE BREAKING
REFERENCE LOAD
R1 1.0 R2 1.0 R3 1.0 R4 -0.8 R5 -0.8 R8 -0.4 R9 -0.4 R10 -0.4
LOAD 21 LOADTYPE Traffic TITLE ACCELERATION
REFERENCE LOAD
R1 1.0 R2 1.0 R3 1.0 R4 0.5 R5 0.5 R8 0.4 R9 0.4 R10 0.4
LOAD 22 LOADTYPE Traffic TITLE CORNERING
REFERENCE LOAD
R1 1.0 R2 1.0 R3 1.0 R6 -0.5 R7 -0.5 R11 -0.4 R12 -0.4 R13 -0.4
LOAD 23 LOADTYPE Traffic TITLE CORNERING
REFERENCE LOAD
R1 1.0 R2 1.0 R3 1.0 R6 0.5 R7 0.5 R11 0.4 R12 0.4 R13 0.4
PERFORM ANALYSIS PRINT STATICS CHECK
FINISH
Regards
Matt