Hi,
Just wondering if I need to do anything to the model below in so far as the UNL of the members 164 to 166 and similar beams are concern? Or is my model setup correctly?
If I do need to setup UNL for members 184 to 166 to reflect its correct unsupported length, how do I write it in the code below? Thanks.
Alex
STAAD SPACESTART JOB INFORMATIONENGINEER DATE 13-Sep-17END JOB INFORMATIONINPUT WIDTH 79UNIT METER KNJOINT COORDINATES1 0 0.52 0; 2 5.2 0 0; 3 13.2 0.8 0; 4 21.2 0.8 0; 5 29.2 0 0; 6 34.4 0.52 0;7 0 0.52 6.3; 8 5.2 0 6.3; 9 13.2 0.8 6.3; 10 21.2 0.8 6.3; 11 29.2 0 6.3;12 34.4 0.52 6.3; 13 0 0.52 12.6; 14 5.2 0 12.6; 15 13.2 0.8 12.6;16 21.2 0.8 12.6; 17 29.2 0 12.6; 18 34.4 0.52 12.6; 19 0 0.52 18.9;20 5.2 0 18.9; 21 13.2 0.8 18.9; 22 21.2 0.8 18.9; 23 29.2 0 18.9;24 34.4 0.52 18.9; 25 0 0.52 25.2; 26 5.2 0 25.2; 27 13.2 0.8 25.2;28 21.2 0.8 25.2; 29 29.2 0 25.2; 30 34.4 0.52 25.2; 31 0 0.52 31.5;32 5.2 0 31.5; 33 13.2 0.8 31.5; 34 21.2 0.8 31.5; 35 29.2 0 31.5;36 34.4 0.52 31.5; 37 0 0.52 37.8; 38 5.2 0 37.8; 39 13.2 0.8 37.8;40 21.2 0.8 37.8; 41 29.2 0 37.8; 42 34.4 0.52 37.8; 43 0 0.52 44.1;44 5.2 0 44.1; 45 13.2 0.8 44.1; 46 21.2 0.8 44.1; 47 29.2 0 44.1;48 34.4 0.52 44.1; 49 0 0.52 50.4; 50 5.2 0 50.4; 51 13.2 0.8 50.4;52 21.2 0.8 50.4; 53 29.2 0 50.4; 54 34.4 0.52 50.4; 55 9.2 0.4 0;56 9.2 0.4 6.3; 57 9.2 0.4 12.6; 58 9.2 0.4 18.9; 59 9.2 0.4 25.2;60 9.2 0.4 31.5; 61 9.2 0.4 37.8; 62 9.2 0.4 44.1; 63 9.2 0.4 50.4;64 17.2 1.2 0; 65 17.2 1.2 6.3; 66 17.2 1.2 12.6; 67 17.2 1.2 18.9;68 17.2 1.2 25.2; 69 17.2 1.2 31.5; 70 17.2 1.2 37.8; 71 17.2 1.2 44.1;72 17.2 1.2 50.4; 73 25.2 0.4 0; 74 25.2 0.4 6.3; 75 25.2 0.4 12.6;76 25.2 0.4 18.9; 77 25.2 0.4 25.2; 78 25.2 0.4 31.5; 79 25.2 0.4 37.8;80 25.2 0.4 44.1; 81 25.2 0.4 50.4;MEMBER INCIDENCES1 1 2; 2 7 8; 3 11 12; 4 13 14; 5 17 18; 6 19 20; 7 23 24; 8 25 26; 9 29 30;10 31 32; 11 35 36; 12 37 38; 13 41 42; 14 43 44; 15 47 48; 16 49 50; 17 53 54;18 1 8; 19 2 7; 20 2 56; 21 56 3; 22 3 65; 23 65 4; 24 4 74; 25 74 5; 26 5 12;27 8 55; 28 55 9; 29 9 64; 30 64 10; 31 10 73; 32 73 11; 33 11 6; 34 25 32;35 26 31; 36 26 60; 37 60 27; 38 27 69; 39 69 28; 40 28 78; 41 29 36; 42 32 59;43 59 33; 44 33 68; 45 68 34; 46 34 77; 47 35 30; 48 43 50; 49 44 49; 50 44 63;51 63 45; 52 45 72; 53 72 46; 54 46 81; 55 81 47; 56 47 54; 57 50 62; 58 62 51;59 51 71; 60 71 52; 61 52 80; 62 80 53; 63 53 48; 64 1 7; 65 7 13; 66 13 19;67 19 25; 68 25 31; 69 31 37; 70 37 43; 71 43 49; 72 2 8; 73 8 14; 74 14 20;75 20 26; 76 26 32; 77 32 38; 78 38 44; 79 44 50; 80 55 56; 81 56 57; 82 57 58;83 58 59; 84 59 60; 85 60 61; 86 61 62; 87 62 63; 88 3 9; 89 9 15; 90 15 21;91 21 27; 92 27 33; 93 33 39; 94 39 45; 95 45 51; 96 64 65; 97 65 66; 98 66 67;99 67 68; 100 68 69; 101 69 70; 102 70 71; 103 71 72; 104 4 10; 105 10 16;106 16 22; 107 22 28; 108 28 34; 109 34 40; 110 40 46; 111 46 52; 112 73 74;113 74 75; 114 75 76; 115 76 77; 116 77 78; 117 78 79; 118 79 80; 119 80 81;120 5 11; 121 11 17; 122 17 23; 123 23 29; 124 29 35; 125 35 41; 126 41 47;127 47 53; 128 6 12; 129 12 18; 130 18 24; 131 24 30; 132 30 36; 133 36 42;134 42 48; 135 48 54; 136 5 6; 137 53 81; 138 81 52; 139 52 72; 140 50 63;141 63 51; 142 51 72; 143 5 73; 144 73 4; 145 4 64; 146 64 3; 147 3 55;148 55 2; 149 23 76; 150 76 22; 151 22 67; 152 67 21; 153 21 58; 154 58 20;155 11 74; 156 10 74; 157 10 65; 158 65 9; 159 9 56; 160 56 8; 161 14 57;162 57 15; 163 15 66; 164 66 16; 165 16 75; 166 75 17; 167 26 59; 168 59 27;169 68 27; 170 68 28; 171 28 77; 172 77 29; 173 35 78; 174 78 34; 175 34 69;176 69 33; 177 60 33; 178 32 60; 179 38 61; 180 39 61; 181 39 70; 182 70 40;183 79 40; 184 79 41; 185 47 80; 186 80 46; 187 46 71; 188 71 45; 189 45 62;190 62 44; 191 29 78; 192 77 35;START USER TABLETABLE 1UNIT METER KNWIDE FLANGEH800X250X8X120.012208 0.8 0.008 0.25 0.012 0.00124301 3.12831e-005 4.20437e-007 0.0064 0.004ENDDEFINE MATERIAL STARTISOTROPIC STEELE 2.05e+008POISSON 0.3DENSITY 76.8195ALPHA 1.2e-005DAMP 0.03END DEFINE MATERIALCONSTANTSBETA 1 MEMB 185MATERIAL STEEL ALLMEMBER PROPERTY CHINESE1 TO 17 136 TO 190 UPTABLE 1 H800X250X8X1264 TO 135 TABLE ST PIP114X6.0MEMBER PROPERTY DUTCH18 TO 63 191 192 TABLE ST RD25SUPPORTS2 TO 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 TO 53 PINNEDLOAD 1 LOADTYPE Dead TITLE SELFWEIGHTSELFWEIGHT Y -1 LOAD 2 LOADTYPE Live TITLE LIVE LOADMEMBER LOAD2 TO 15 149 TO 190 UNI GY -3.151 16 17 136 TO 148 UNI GY -1.575LOAD 3 LOADTYPE Dead TITLE PURLINS DEAD LOADMEMBER LOAD2 TO 15 149 TO 190 UNI GY -3.151 16 17 136 TO 148 UNI GY -1.575LOAD 4 LOADTYPE Roof Live REDUCIBLE TITLE ROOF MOBILE LOADMEMBER LOAD2 TO 15 149 TO 190 UNI GY -1.891 16 17 136 TO 148 UNI GY -0.945LOAD 5 LOADTYPE Temperature TITLE TEMPERATURE LOADTEMPERATURE LOAD1 TO 192 TEMP 5 5 5LOAD 6 LOADTYPE Wind TITLE WIND LOAD 1JOINT LOAD9 10 15 16 21 22 27 28 33 34 39 40 45 46 56 TO 62 65 TO 71 74 TO 80 FY -7.63 4 51 52 55 63 64 72 73 81 FY -3.82 5 50 53 FY -4.368 11 14 17 20 23 26 29 32 35 38 41 44 47 FY -8.7311 6 49 54 FY -2.477 12 13 18 19 24 25 30 31 36 37 42 43 48 FY -4.94LOAD 7 LOADTYPE Wind TITLE WIND LOAD 2JOINT LOAD9 10 15 16 21 22 27 28 33 34 39 40 45 46 56 TO 62 65 TO 71 74 TO 80 FY 7.63 4 51 52 55 63 64 72 73 81 FY 3.82 5 50 53 FY 4.368 11 14 17 20 23 26 29 32 35 38 41 44 47 FY 8.7311 6 49 54 FY 2.477 12 13 18 19 24 25 30 31 36 37 42 43 48 FY 4.94LOAD COMB 8 SERVICEABILITY1 1.0 2 1.0 3 1.0 4 1.0 5 1.0 6 1.0 LOAD COMB 9 ULTIMATE1 1.4 2 1.6 3 1.4 4 1.4 5 1.2 6 1.2 LOAD COMB 10 SERVICEABILITY1 1.0 2 1.0 3 1.0 4 1.0 5 1.0 7 1.0 LOAD COMB 11 ULTIMATE1 1.4 2 1.6 3 1.4 4 1.4 5 1.2 7 1.2 PERFORM ANALYSISPRINT JOINT DISPLACEMENTS ALLPRINT MEMBER FORCES LIST 1 TO 136PRINT SUPPORT REACTION LIST 2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 53PARAMETER 1CODE BS5950CHECK CODE ALLFINISH
As far as UNL is concerned, you don’t need to specify anything as long as the transverse members may be considered as providing lateral restraint to the compression flanges of these beams 161 to 166. Since the members are split by these transverse beams, the default UNL, which is equal to the member length, should be OK. You should however specify the unsupported length for flexural buckling about the major axis (LZ) and set it to an appropriate value as shown next.
PARAMETER 1
CODE BS5950
LZ 24 MEMB 161 TO 166
CHECK CODE ALL
The LY does not need to be specified as the default should work.
Ok understood. Thank you for your explanation.