Hello,
I have designed a platform stair system in STAAD PRO and I am analyzing the effects of using Moment Frame and or Ordinary Frames in it. I have attached 2 models here - One pertaining to Moment Frame (With no releases in platform members) and other pertaining to Ordinary Frame (with moment releases in the members). As expected I can see the difference between moment diagrams, but I thought that by using moment frames, I will also see lesser deflections as the system is stiff now. But I am seeing almost exact deflections. Have I used releases wrong in the model? Can someone please confirm. Any help will be appreciated.
Thanks.
STAAD SPACE START JOB INFORMATION ENGINEER DATE 21-Aug-18 JOB NAME Harmon JOB REF RTU-02 Platform END JOB INFORMATION INPUT WIDTH 79 UNIT INCHES POUND JOINT COORDINATES 1 -18 0 0; 2 -18 0 -36; 5 33 0 0; 6 33 0 -36; 9 84 0 0; 10 84 0 -36; 13 112 0 0; 14 112 0 -36; 15 140 0 0; 16 140 0 -36; 17 168 0 0; 18 168 0 -36; 19 -18 96 0; 20 -18 96 -36; 21 33 96 0; 22 33 96 -36; 23 84 96 0; 24 84 96 -36; 25 112 64 0; 26 112 64 -36; 27 140 32 0; 28 140 32 -36; 39 -18 138 0; 40 -18 138 -36; 41 33 138 -36; 42 84 138 -36; 46 -18 117 -36; 47 -18 117 0; 51 84 117 -36; 52 33 117 -36; 53 84 138 0; 54 112 100 0; 55 112 100 -36; 56 140 68 0; 57 140 68 -36; 58 168 36 0; 59 168 36 -36; 60 84 132 -36; 61 84 132 0; 62 168 18 -36; 63 140 50 -36; 64 84 114 0; 65 112 82 0; 66 140 50 0; 67 168 18 0; 68 84 114 -36; 69 112 82 -36; MEMBER INCIDENCES 1 1 19; 3 2 20; 5 5 21; 7 6 22; 9 9 23; 11 10 24; 13 19 21; 14 21 23; 15 20 22; 16 22 24; 17 23 25; 18 24 26; 19 20 19; 20 22 21; 21 23 24; 22 13 25; 23 14 26; 24 15 27; 25 16 28; 59 23 26; 60 26 27; 61 27 18; 64 19 47; 65 20 46; 66 22 52; 67 24 68; 74 42 41; 75 41 40; 76 40 39; 77 46 40; 83 51 60; 85 52 41; 87 51 52; 88 52 46; 89 46 47; 90 47 39; 91 27 17; 92 25 27; 93 28 18; 94 26 28; 95 26 25; 96 28 27; 97 23 64; 98 25 65; 99 26 69; 100 27 66; 101 28 63; 102 17 67; 103 18 62; 104 58 56; 105 56 54; 106 59 57; 107 57 55; 108 60 42; 109 55 60; 110 61 53; 111 54 61; 112 62 59; 113 63 57; 114 62 63; 115 64 61; 116 65 54; 117 64 65; 118 66 56; 119 67 58; 120 66 67; 121 68 51; 122 69 55; 123 68 69; 124 69 63; 125 66 65; MEMBER RELEASE 13 TO 16 19 TO 21 95 96 START MY MZ 13 TO 16 19 TO 21 95 96 END MY MZ DEFINE MATERIAL START ISOTROPIC STEEL E 2.9e+007 POISSON 0.3 DENSITY 0.283 ALPHA 6e-006 DAMP 0.03 TYPE STEEL STRENGTH FY 36000 FU 58000 RY 1.5 RT 1.2 END DEFINE MATERIAL MEMBER PROPERTY AMERICAN 64 TO 67 74 TO 77 83 85 87 TO 90 97 TO 125 TABLE ST HSSP1.900X0.12 1 3 5 7 9 11 13 TO 16 19 TO 25 59 TO 61 95 96 TABLE ST HSST2X2X0.125 17 18 91 TO 94 TABLE ST MC10X8 CONSTANTS BETA 180 MEMB 17 91 92 MATERIAL STEEL ALL MEMBER TRUSS 59 TO 61 SUPPORTS 19 21 23 FIXED BUT FX FY MX MY MZ 1 2 5 6 9 10 13 TO 18 FIXED LOAD 1 LOADTYPE Dead TITLE DEAD SELFWEIGHT Y -1 UNIT FEET POUND MEMBER LOAD 20 UNI GY -28 19 21 UNI GY -14 17 18 91 TO 94 UNI GY -15 LOAD 2 LOADTYPE Roof Live TITLE LIVE ROOF MEMBER LOAD 20 UNI GY -140 19 21 UNI GY -70 17 18 91 TO 94 UNI GY -150 LOAD 3 LOADTYPE Ice TITLE ICE MEMBER LOAD 1 3 5 7 9 11 13 TO 16 19 TO 25 59 TO 61 95 96 UNI GY -9.1 64 TO 67 74 TO 77 83 85 87 TO 90 97 TO 125 UNI GY -7.3 17 18 91 TO 94 UNI GY -23.9 13 TO 18 91 TO 94 UNI GY -30 LOAD 4 LOADTYPE Wind TITLE WIND Z MEMBER LOAD 3 7 11 15 16 23 25 UNI GZ 10.5 18 93 94 UNI GZ 52.5 65 TO 67 74 75 77 83 85 87 88 99 101 103 106 TO 109 112 TO 114 121 TO 123 - 124 UNI GZ 10.75 LOAD 5 LOADTYPE Wind TITLE WIND X MEMBER LOAD 1 3 19 59 TO 61 95 96 UNI GX 11.3 64 65 76 77 89 90 UNI GX 10.8 LOAD 6 LOADTYPE Wind TITLE WIND -Z MEMBER LOAD 9 22 24 UNI GZ -10.5 17 91 92 UNI GZ -52.5 97 98 100 102 104 105 110 111 115 TO 120 125 UNI GZ -10.75 14 UNI GZ -10.5 3.25 4.25 74 87 UNI GZ -10.75 0 1 LOAD 7 LOADTYPE Wind TITLE WIND -X MEMBER LOAD 21 59 TO 61 95 96 UNI GX -11.3 76 89 102 TO 112 119 UNI GX -10.8 LOAD 8 LOADTYPE Wind on Ice TITLE WIND ON ICE Z MEMBER LOAD 3 7 11 15 16 23 25 UNI GZ 5.8 18 93 94 UNI GZ 14.5 65 TO 67 74 75 77 83 85 87 88 99 101 103 106 TO 109 112 TO 114 121 TO 123 - 124 UNI GZ 5.7 LOAD 9 LOADTYPE Wind on Ice TITLE WIND ON ICE X MEMBER LOAD 1 3 19 59 TO 61 95 96 UNI GX 6.2 64 65 76 77 89 90 UNI GX 6.1 LOAD 10 LOADTYPE Wind on Ice TITLE WIND ON ICE -Z MEMBER LOAD 9 22 24 UNI GZ -5.8 17 91 92 UNI GZ -14.5 97 98 100 102 104 105 110 111 115 TO 120 125 UNI GZ -5.7 14 UNI GZ -5.8 3.25 4.25 74 87 UNI GZ -5.7 0 1 LOAD 11 LOADTYPE Wind on Ice TITLE WIND ON ICE -X MEMBER LOAD 21 59 TO 61 95 96 UNI GX -6.2 76 89 102 TO 112 119 UNI GX -6.1 LOAD 12 LOADTYPE Snow TITLE SNOW BALANCED MEMBER LOAD 20 UNI GY -73.5 19 21 UNI GY -36.75 17 18 91 TO 94 UNI GY -31.5 LOAD 13 LOADTYPE Snow TITLE SNOW DRIFT MEMBER LOAD 19 TRAP GY -29 -53.125 20 TRAP GY -58 -106.25 21 TRAP GY -28.125 -15.356 LOAD 14 LOADTYPE Roof Live REDUCIBLE TITLE LIVE LOAD 1000LBS MEMBER LOAD 96 CON GY -300 0.05 20 UNI GY -140 19 21 UNI GY -70 *LOAD COMB 101 D *1 1.0 *LOAD COMB 102 D+LR *1 1.0 2 1.0 *LOAD COMB 103 D+0.75LR *1 1.0 2 0.75 *LOAD COMB 104 D+W_Z *1 1.0 4 1.0 *LOAD COMB 105 D-W_Z *1 1.0 6 1.0 *LOAD COMB 106 D+W_X *1 1.0 5 1.0 *LOAD COMB 107 D-W_X *1 1.0 7 1.0 *LOAD COMB 108 D+0.75W_Z+0.75LR *1 1.0 4 0.75 2 0.75 *LOAD COMB 109 D-0.75W_Z+0.75LR *1 1.0 10 0.75 2 0.75 *LOAD COMB 110 D+0.75W_X+0.75LR *1 1.0 5 0.75 2 0.75 *LOAD COMB 111 D-0.75W_X+0.75LR *1 1.0 7 0.75 2 0.75 *LOAD COMB 112 0.6D+W_Z *1 0.6 4 1.0 *LOAD COMB 113 0.6D-W_Z *1 0.6 6 1.0 *LOAD COMB 114 0.6D+W_X *1 0.6 5 1.0 *LOAD COMB 115 0.6D-W_X *1 0.6 7 1.0 *LOAD COMB 131 D+0.7DI *1 1.0 3 0.7 *LOAD COMB 132 D+0.7DI+0.7WI_Z *1 1.0 3 0.7 8 0.7 *LOAD COMB 133 D+0.7DI-0.7WI_Z *1 1.0 3 0.7 6 0.7 *LOAD COMB 134 D+0.7DI+0.7WI_X *1 1.0 3 0.7 5 0.7 *LOAD COMB 135 D+0.7DI-0.7WI_X *1 1.0 3 0.7 7 0.7 *LOAD COMB 136 0.6D+0.7DI+0.7WI_Z *1 0.6 3 0.7 8 0.7 *LOAD COMB 137 0.6D+0.7DI-0.7WI_Z *1 0.6 3 0.7 6 0.7 *LOAD COMB 138 0.6D+0.7DI+0.7WI_X *1 0.6 3 0.7 5 0.7 *LOAD COMB 139 0.6D+0.7DI-0.7WI_X *1 0.6 3 0.7 7 0.7 *PERFORM ANALYSIS *DEFINE ENVELOPE *101 TO 115 131 TO 139 ENVELOPE 1 TYPE STRENGTH *END DEFINE ENVELOPE LOAD COMB 101 D 1 1.0 LOAD COMB 102 D+LR 1 1.0 2 1.0 LOAD COMB 103 D+S_BAL+S_D 1 1.0 12 1.0 13 1.0 LOAD COMB 104 D+0.75LR 1 1.0 2 0.75 LOAD COMB 105 D+0.75S_BAL 1 1.0 12 0.75 LOAD COMB 106 D+W_Z 1 1.0 4 1.0 LOAD COMB 107 D-W_Z 1 1.0 6 1.0 LOAD COMB 108 D+W_X 1 1.0 5 1.0 LOAD COMB 109 D-W_X 1 1.0 7 1.0 LOAD COMB 110 D+0.75W_Z+0.75LR 1 1.0 4 0.75 2 0.75 LOAD COMB 111 D-0.75W_Z+0.75LR 1 1.0 10 0.75 2 0.75 LOAD COMB 112 D+0.75W_X+0.75LR 1 1.0 5 0.75 2 0.75 LOAD COMB 113 D-0.75W_X+0.75LR 1 1.0 7 0.75 2 0.75 LOAD COMB 114 D+0.75W_Z+0.75S_BAL 1 1.0 4 0.75 12 0.75 LOAD COMB 115 D-0.75W_Z+0.75S_BAL 1 1.0 10 0.75 12 0.75 LOAD COMB 116 D+0.75W_X+0.75S_BAL 1 1.0 5 0.75 12 0.75 LOAD COMB 117 D-0.75W_X+0.75S_BAL 1 1.0 7 0.75 12 0.75 LOAD COMB 118 0.6D+W_Z 1 0.6 4 1.0 LOAD COMB 119 0.6D-W_Z 1 0.6 6 1.0 LOAD COMB 120 0.6D+W_X 1 0.6 5 1.0 LOAD COMB 121 0.6D-W_X 1 0.6 7 1.0 LOAD COMB 131 D+0.7DI 1 1.0 3 0.7 LOAD COMB 132 D+0.7DI+0.7WI_Z+S_BAL+S_D 1 1.0 3 0.7 8 0.7 12 1.0 13 1.0 LOAD COMB 133 D+0.7DI-0.7WI_Z+S_BAL+S_D 1 1.0 3 0.7 6 0.7 12 1.0 13 1.0 LOAD COMB 134 D+0.7DI+0.7WI_X+S_BAL+S_D 1 1.0 3 0.7 5 0.7 12 1.0 13 1.0 LOAD COMB 135 D+0.7DI-0.7WI_X+S_BAL+S_D 1 1.0 3 0.7 7 0.7 12 1.0 13 1.0 LOAD COMB 136 0.6D+0.7DI+0.7WI_Z 1 0.6 3 0.7 8 0.7 LOAD COMB 137 0.6D+0.7DI-0.7WI_Z 1 0.6 3 0.7 6 0.7 LOAD COMB 138 0.6D+0.7DI+0.7WI_X 1 0.6 3 0.7 5 0.7 LOAD COMB 139 0.6D+0.7DI-0.7WI_X 1 0.6 3 0.7 7 0.7 LOAD COMB 201 D+LR 1 1.0 14 1.0 LOAD COMB 202 D+0.75LR 1 1.0 14 0.75 LOAD COMB 203 D+0.75W_Z+0.75LR 1 1.0 4 0.75 14 0.75 LOAD COMB 204 D-0.75W_Z+0.75LR 1 1.0 10 0.75 14 0.75 LOAD COMB 205 D+0.75W_X+0.75LR 1 1.0 5 0.75 14 0.75 LOAD COMB 206 D-0.75W_X+0.75LR 1 1.0 7 0.75 14 0.75 PERFORM ANALYSIS DEFINE ENVELOPE 101 TO 121 131 TO 139 201 TO 206 ENVELOPE 1 TYPE STRENGTH END DEFINE ENVELOPE LOAD LIST ENV 1 PARAMETER 1 CODE AISC UNIFIED 2010 FYLD 5.184e+006 MEMB 17 18 91 TO 94 FYLD 6.048e+006 MEMB 64 TO 67 74 TO 77 83 85 87 TO 90 97 TO 125 FYLD 6.624e+006 MEMB 1 3 5 7 9 11 13 TO 16 19 TO 25 59 TO 61 95 96 FU 8.352e+006 ALL LZ 1.75 MEMB 64 65 77 90 LY 1.5 MEMB 98 TO 103 112 113 116 118 119 122 LY 1.75 MEMB 64 TO 67 77 83 85 90 97 108 115 121 METHOD ASD CHECK CODE ALL FINISH
STAAD SPACE START JOB INFORMATION ENGINEER DATE 21-Aug-18 JOB NAME Harmon JOB REF RTU-02 Platform END JOB INFORMATION INPUT WIDTH 79 UNIT INCHES POUND JOINT COORDINATES 1 -18 0 0; 2 -18 0 -36; 5 33 0 0; 6 33 0 -36; 9 84 0 0; 10 84 0 -36; 13 112 0 0; 14 112 0 -36; 15 140 0 0; 16 140 0 -36; 17 168 0 0; 18 168 0 -36; 19 -18 96 0; 20 -18 96 -36; 21 33 96 0; 22 33 96 -36; 23 84 96 0; 24 84 96 -36; 25 112 64 0; 26 112 64 -36; 27 140 32 0; 28 140 32 -36; 39 -18 138 0; 40 -18 138 -36; 41 33 138 -36; 42 84 138 -36; 46 -18 117 -36; 47 -18 117 0; 51 84 117 -36; 52 33 117 -36; 53 84 138 0; 54 112 100 0; 55 112 100 -36; 56 140 68 0; 57 140 68 -36; 58 168 36 0; 59 168 36 -36; 60 84 132 -36; 61 84 132 0; 62 168 18 -36; 63 140 50 -36; 64 84 114 0; 65 112 82 0; 66 140 50 0; 67 168 18 0; 68 84 114 -36; 69 112 82 -36; MEMBER INCIDENCES 1 1 19; 3 2 20; 5 5 21; 7 6 22; 9 9 23; 11 10 24; 13 19 21; 14 21 23; 15 20 22; 16 22 24; 17 23 25; 18 24 26; 19 20 19; 20 22 21; 21 23 24; 22 13 25; 23 14 26; 24 15 27; 25 16 28; 59 23 26; 60 26 27; 61 27 18; 64 19 47; 65 20 46; 66 22 52; 67 24 68; 74 42 41; 75 41 40; 76 40 39; 77 46 40; 83 51 60; 85 52 41; 87 51 52; 88 52 46; 89 46 47; 90 47 39; 91 27 17; 92 25 27; 93 28 18; 94 26 28; 95 26 25; 96 28 27; 97 23 64; 98 25 65; 99 26 69; 100 27 66; 101 28 63; 102 17 67; 103 18 62; 104 58 56; 105 56 54; 106 59 57; 107 57 55; 108 60 42; 109 55 60; 110 61 53; 111 54 61; 112 62 59; 113 63 57; 114 62 63; 115 64 61; 116 65 54; 117 64 65; 118 66 56; 119 67 58; 120 66 67; 121 68 51; 122 69 55; 123 68 69; 124 69 63; 125 66 65; MEMBER RELEASE 19 TO 21 95 96 START MY MZ 19 TO 21 95 96 END MY MZ DEFINE MATERIAL START ISOTROPIC STEEL E 2.9e+007 POISSON 0.3 DENSITY 0.283 ALPHA 6e-006 DAMP 0.03 TYPE STEEL STRENGTH FY 36000 FU 58000 RY 1.5 RT 1.2 END DEFINE MATERIAL MEMBER PROPERTY AMERICAN 64 TO 67 74 TO 77 83 85 87 TO 90 97 TO 125 TABLE ST HSSP1.900X0.12 1 3 5 7 9 11 13 TO 16 19 TO 25 59 TO 61 95 96 TABLE ST HSST2X2X0.125 17 18 91 TO 94 TABLE ST MC10X8 CONSTANTS BETA 180 MEMB 17 91 92 MATERIAL STEEL ALL MEMBER TRUSS 59 TO 61 SUPPORTS 19 21 23 FIXED BUT FX FY MX MY MZ 1 2 5 6 9 10 13 TO 18 FIXED LOAD 1 LOADTYPE Dead TITLE DEAD SELFWEIGHT Y -1 UNIT FEET POUND MEMBER LOAD 20 UNI GY -28 19 21 UNI GY -14 17 18 91 TO 94 UNI GY -15 LOAD 2 LOADTYPE Roof Live TITLE LIVE ROOF MEMBER LOAD 20 UNI GY -140 19 21 UNI GY -70 17 18 91 TO 94 UNI GY -150 LOAD 3 LOADTYPE Ice TITLE ICE MEMBER LOAD 1 3 5 7 9 11 13 TO 16 19 TO 25 59 TO 61 95 96 UNI GY -9.1 64 TO 67 74 TO 77 83 85 87 TO 90 97 TO 125 UNI GY -7.3 17 18 91 TO 94 UNI GY -23.9 13 TO 18 91 TO 94 UNI GY -30 LOAD 4 LOADTYPE Wind TITLE WIND Z MEMBER LOAD 3 7 11 15 16 23 25 UNI GZ 10.5 18 93 94 UNI GZ 52.5 65 TO 67 74 75 77 83 85 87 88 99 101 103 106 TO 109 112 TO 114 121 TO 123 - 124 UNI GZ 10.75 LOAD 5 LOADTYPE Wind TITLE WIND X MEMBER LOAD 1 3 19 59 TO 61 95 96 UNI GX 11.3 64 65 76 77 89 90 UNI GX 10.8 LOAD 6 LOADTYPE Wind TITLE WIND -Z MEMBER LOAD 9 22 24 UNI GZ -10.5 17 91 92 UNI GZ -52.5 97 98 100 102 104 105 110 111 115 TO 120 125 UNI GZ -10.75 14 UNI GZ -10.5 3.25 4.25 74 87 UNI GZ -10.75 0 1 LOAD 7 LOADTYPE Wind TITLE WIND -X MEMBER LOAD 21 59 TO 61 95 96 UNI GX -11.3 76 89 102 TO 112 119 UNI GX -10.8 LOAD 8 LOADTYPE Wind on Ice TITLE WIND ON ICE Z MEMBER LOAD 3 7 11 15 16 23 25 UNI GZ 5.8 18 93 94 UNI GZ 14.5 65 TO 67 74 75 77 83 85 87 88 99 101 103 106 TO 109 112 TO 114 121 TO 123 - 124 UNI GZ 5.7 LOAD 9 LOADTYPE Wind on Ice TITLE WIND ON ICE X MEMBER LOAD 1 3 19 59 TO 61 95 96 UNI GX 6.2 64 65 76 77 89 90 UNI GX 6.1 LOAD 10 LOADTYPE Wind on Ice TITLE WIND ON ICE -Z MEMBER LOAD 9 22 24 UNI GZ -5.8 17 91 92 UNI GZ -14.5 97 98 100 102 104 105 110 111 115 TO 120 125 UNI GZ -5.7 14 UNI GZ -5.8 3.25 4.25 74 87 UNI GZ -5.7 0 1 LOAD 11 LOADTYPE Wind on Ice TITLE WIND ON ICE -X MEMBER LOAD 21 59 TO 61 95 96 UNI GX -6.2 76 89 102 TO 112 119 UNI GX -6.1 LOAD 12 LOADTYPE Snow TITLE SNOW BALANCED MEMBER LOAD 20 UNI GY -73.5 19 21 UNI GY -36.75 17 18 91 TO 94 UNI GY -31.5 LOAD 13 LOADTYPE Snow TITLE SNOW DRIFT MEMBER LOAD 19 TRAP GY -29 -53.125 20 TRAP GY -58 -106.25 21 TRAP GY -28.125 -15.356 LOAD 14 LOADTYPE Roof Live REDUCIBLE TITLE LIVE LOAD 1000LBS MEMBER LOAD 96 CON GY -300 0.05 20 UNI GY -140 19 21 UNI GY -70 *LOAD COMB 101 D *1 1.0 *LOAD COMB 102 D+LR *1 1.0 2 1.0 *LOAD COMB 103 D+0.75LR *1 1.0 2 0.75 *LOAD COMB 104 D+W_Z *1 1.0 4 1.0 *LOAD COMB 105 D-W_Z *1 1.0 6 1.0 *LOAD COMB 106 D+W_X *1 1.0 5 1.0 *LOAD COMB 107 D-W_X *1 1.0 7 1.0 *LOAD COMB 108 D+0.75W_Z+0.75LR *1 1.0 4 0.75 2 0.75 *LOAD COMB 109 D-0.75W_Z+0.75LR *1 1.0 10 0.75 2 0.75 *LOAD COMB 110 D+0.75W_X+0.75LR *1 1.0 5 0.75 2 0.75 *LOAD COMB 111 D-0.75W_X+0.75LR *1 1.0 7 0.75 2 0.75 *LOAD COMB 112 0.6D+W_Z *1 0.6 4 1.0 *LOAD COMB 113 0.6D-W_Z *1 0.6 6 1.0 *LOAD COMB 114 0.6D+W_X *1 0.6 5 1.0 *LOAD COMB 115 0.6D-W_X *1 0.6 7 1.0 *LOAD COMB 131 D+0.7DI *1 1.0 3 0.7 *LOAD COMB 132 D+0.7DI+0.7WI_Z *1 1.0 3 0.7 8 0.7 *LOAD COMB 133 D+0.7DI-0.7WI_Z *1 1.0 3 0.7 6 0.7 *LOAD COMB 134 D+0.7DI+0.7WI_X *1 1.0 3 0.7 5 0.7 *LOAD COMB 135 D+0.7DI-0.7WI_X *1 1.0 3 0.7 7 0.7 *LOAD COMB 136 0.6D+0.7DI+0.7WI_Z *1 0.6 3 0.7 8 0.7 *LOAD COMB 137 0.6D+0.7DI-0.7WI_Z *1 0.6 3 0.7 6 0.7 *LOAD COMB 138 0.6D+0.7DI+0.7WI_X *1 0.6 3 0.7 5 0.7 *LOAD COMB 139 0.6D+0.7DI-0.7WI_X *1 0.6 3 0.7 7 0.7 *PERFORM ANALYSIS *DEFINE ENVELOPE *101 TO 115 131 TO 139 ENVELOPE 1 TYPE STRENGTH *END DEFINE ENVELOPE LOAD COMB 101 D 1 1.0 LOAD COMB 102 D+LR 1 1.0 2 1.0 LOAD COMB 103 D+S_BAL+S_D 1 1.0 12 1.0 13 1.0 LOAD COMB 104 D+0.75LR 1 1.0 2 0.75 LOAD COMB 105 D+0.75S_BAL 1 1.0 12 0.75 LOAD COMB 106 D+W_Z 1 1.0 4 1.0 LOAD COMB 107 D-W_Z 1 1.0 6 1.0 LOAD COMB 108 D+W_X 1 1.0 5 1.0 LOAD COMB 109 D-W_X 1 1.0 7 1.0 LOAD COMB 110 D+0.75W_Z+0.75LR 1 1.0 4 0.75 2 0.75 LOAD COMB 111 D-0.75W_Z+0.75LR 1 1.0 10 0.75 2 0.75 LOAD COMB 112 D+0.75W_X+0.75LR 1 1.0 5 0.75 2 0.75 LOAD COMB 113 D-0.75W_X+0.75LR 1 1.0 7 0.75 2 0.75 LOAD COMB 114 D+0.75W_Z+0.75S_BAL 1 1.0 4 0.75 12 0.75 LOAD COMB 115 D-0.75W_Z+0.75S_BAL 1 1.0 10 0.75 12 0.75 LOAD COMB 116 D+0.75W_X+0.75S_BAL 1 1.0 5 0.75 12 0.75 LOAD COMB 117 D-0.75W_X+0.75S_BAL 1 1.0 7 0.75 12 0.75 LOAD COMB 118 0.6D+W_Z 1 0.6 4 1.0 LOAD COMB 119 0.6D-W_Z 1 0.6 6 1.0 LOAD COMB 120 0.6D+W_X 1 0.6 5 1.0 LOAD COMB 121 0.6D-W_X 1 0.6 7 1.0 LOAD COMB 131 D+0.7DI 1 1.0 3 0.7 LOAD COMB 132 D+0.7DI+0.7WI_Z+S_BAL+S_D 1 1.0 3 0.7 8 0.7 12 1.0 13 1.0 LOAD COMB 133 D+0.7DI-0.7WI_Z+S_BAL+S_D 1 1.0 3 0.7 6 0.7 12 1.0 13 1.0 LOAD COMB 134 D+0.7DI+0.7WI_X+S_BAL+S_D 1 1.0 3 0.7 5 0.7 12 1.0 13 1.0 LOAD COMB 135 D+0.7DI-0.7WI_X+S_BAL+S_D 1 1.0 3 0.7 7 0.7 12 1.0 13 1.0 LOAD COMB 136 0.6D+0.7DI+0.7WI_Z 1 0.6 3 0.7 8 0.7 LOAD COMB 137 0.6D+0.7DI-0.7WI_Z 1 0.6 3 0.7 6 0.7 LOAD COMB 138 0.6D+0.7DI+0.7WI_X 1 0.6 3 0.7 5 0.7 LOAD COMB 139 0.6D+0.7DI-0.7WI_X 1 0.6 3 0.7 7 0.7 LOAD COMB 201 D+LR 1 1.0 14 1.0 LOAD COMB 202 D+0.75LR 1 1.0 14 0.75 LOAD COMB 203 D+0.75W_Z+0.75LR 1 1.0 4 0.75 14 0.75 LOAD COMB 204 D-0.75W_Z+0.75LR 1 1.0 10 0.75 14 0.75 LOAD COMB 205 D+0.75W_X+0.75LR 1 1.0 5 0.75 14 0.75 LOAD COMB 206 D-0.75W_X+0.75LR 1 1.0 7 0.75 14 0.75 PERFORM ANALYSIS DEFINE ENVELOPE 101 TO 121 131 TO 139 201 TO 206 ENVELOPE 1 TYPE STRENGTH END DEFINE ENVELOPE LOAD LIST ENV 1 PARAMETER 1 CODE AISC UNIFIED 2010 FYLD 5.184e+006 MEMB 17 18 91 TO 94 FYLD 6.048e+006 MEMB 64 TO 67 74 TO 77 83 85 87 TO 90 97 TO 125 FYLD 6.624e+006 MEMB 1 3 5 7 9 11 13 TO 16 19 TO 25 59 TO 61 95 96 FU 8.352e+006 ALL LZ 1.75 MEMB 64 65 77 90 LY 1.5 MEMB 98 TO 103 112 113 116 118 119 122 LY 1.75 MEMB 64 TO 67 77 83 85 90 97 108 115 121 METHOD ASD CHECK CODE ALL FINISH
Hi Sal - your releases are correctly defined. your moment frames are stiffening the structure in the X direction and when I check the displacements in that direction, I see appreciable differences, although the absolute values may be small. You need to narrow down your results to combinations with loads in the X-direction.
Another way of testing your structure behavior would be to create a dummy load case with only X-forces acting at the top of your moment frames and then you'll see a difference.
I hope this helps
B. ZIANE
Thanks a lot for your response. Can you please tell me how much difference can you see in displacements. I can see in the worst case scenario like 0.02 only.
Hi Sal ,
As I mentioned the absolute values are very small. The reason is that majority of the horizontal X-forces is resisted by the stringers that are acting like bracing elements. Therefore, the moment frames are of little help.