Please see the attached model.
STAAD SPACESTART JOB INFORMATIONENGINEER DATE 20-Oct-17END JOB INFORMATIONINPUT WIDTH 79UNIT METER KNJOINT COORDINATES1 0 0 0; 2 3 0 0; 5 0 0 3; 6 3 0 3; 9 0 0 6; 10 3 0 6; 13 0 0 9; 14 3 0 9;17 0 0 12; 18 3 0 12; 21 0 0 15; 22 3 0 15; 25 0 0 18; 26 3 0 18; 29 0 0 21;30 3 0 21; 33 0 0 24; 34 3 0 24; 37 0 0 27; 38 3 0 27; 41 0 0 30; 42 3 0 30;45 0 0 33; 46 3 0 33; 49 0 0 36; 50 3 0 36; 53 0 0 39; 54 3 0 39; 57 0 0 42;58 3 0 42; 61 0 0 45; 62 3 0 45; 65 0 0 48; 66 3 0 48; 69 0 0 51; 70 3 0 51;73 0 0 54; 74 3 0 54; 75 0 2.5 1.5; 76 3 2.5 1.5; 77 0 2.5 4.5; 78 3 2.5 4.5;79 0 2.5 7.5; 80 3 2.5 7.5; 81 0 2.5 10.5; 82 3 2.5 10.5; 83 0 2.5 13.5;84 3 2.5 13.5; 85 0 2.5 16.5; 86 3 2.5 16.5; 87 0 2.5 19.5; 88 3 2.5 19.5;89 0 2.5 22.5; 90 3 2.5 22.5; 91 0 2.5 25.5; 92 3 2.5 25.5; 93 0 2.5 28.5;94 3 2.5 28.5; 95 0 2.5 31.5; 96 3 2.5 31.5; 97 0 2.5 34.5; 98 3 2.5 34.5;99 0 2.5 37.5; 100 3 2.5 37.5; 101 0 2.5 40.5; 102 3 2.5 40.5; 103 0 2.5 43.5;104 3 2.5 43.5; 105 0 2.5 46.5; 106 3 2.5 46.5; 107 0 2.5 49.5; 108 3 2.5 49.5;109 0 2.5 52.5; 110 3 2.5 52.5; 111 1.5 2.5 51; 112 1.5 2.5 3; 113 1.5 2.5 21;114 1.5 2.5 36;MEMBER INCIDENCES1 1 2; 2 5 6; 3 9 10; 4 13 14; 5 17 18; 6 21 22; 7 25 26; 8 29 30; 9 33 34;10 37 38; 11 41 42; 12 45 46; 13 49 50; 14 53 54; 15 57 58; 16 61 62; 17 65 66;18 69 70; 19 73 74; 20 1 5; 21 2 6; 22 5 9; 23 6 10; 24 9 13; 25 10 14;26 13 17; 27 14 18; 28 17 21; 29 18 22; 30 21 25; 31 22 26; 32 25 29; 33 26 30;34 29 33; 35 30 34; 36 33 37; 37 34 38; 38 37 41; 39 38 42; 40 41 45; 41 42 46;42 45 49; 43 46 50; 44 49 53; 45 50 54; 46 53 57; 47 54 58; 48 57 61; 49 58 62;50 61 65; 51 62 66; 52 65 69; 53 66 70; 54 69 73; 55 70 74; 56 1 75; 57 75 5;58 2 76; 59 76 6; 60 5 77; 61 77 9; 62 6 78; 63 78 10; 64 9 79; 65 79 13;66 10 80; 67 80 14; 68 13 81; 69 81 17; 70 14 82; 71 82 18; 72 17 83; 73 83 21;74 18 84; 75 84 22; 76 21 85; 77 85 25; 78 22 86; 79 86 26; 80 25 87; 81 87 29;82 26 88; 83 88 30; 84 29 89; 85 89 33; 86 30 90; 87 90 34; 88 33 91; 89 91 37;90 34 92; 91 92 38; 92 37 93; 93 93 41; 94 38 94; 95 94 42; 96 41 95; 97 95 45;98 42 96; 99 96 46; 100 45 97; 101 97 49; 102 46 98; 103 98 50; 104 49 99;105 99 53; 106 50 100; 107 100 54; 108 53 101; 109 101 57; 110 54 102;111 102 58; 112 57 103; 113 103 61; 114 58 104; 115 104 62; 116 61 105;117 105 65; 118 62 106; 119 106 66; 120 65 107; 121 107 69; 122 66 108;123 108 70; 124 69 109; 125 109 73; 126 70 110; 127 110 74; 128 75 77;129 76 78; 130 77 79; 131 78 80; 132 79 81; 133 80 82; 134 81 83; 135 82 84;136 83 85; 137 84 86; 138 85 87; 139 86 88; 140 87 89; 141 88 90; 142 89 91;143 90 92; 144 91 93; 145 92 94; 146 93 95; 147 94 96; 148 95 97; 149 96 98;150 97 99; 151 98 100; 152 99 101; 153 100 102; 154 101 103; 155 102 104;156 103 105; 157 104 106; 158 105 107; 159 106 108; 160 107 109; 161 108 110;162 75 76; 163 77 78; 164 79 80; 165 81 82; 166 83 84; 167 85 86; 168 87 88;169 89 90; 170 91 92; 171 93 94; 172 95 96; 173 97 98; 174 99 100; 175 101 102;176 103 104; 177 105 106; 178 107 108; 179 109 110; 180 74 69; 181 69 66;182 66 61; 183 61 58; 184 58 53; 185 53 50; 186 50 45; 187 45 42; 188 42 37;189 37 34; 190 34 29; 191 29 26; 192 26 21; 193 21 18; 194 18 13; 195 13 10;196 10 5; 197 5 2; 198 109 111; 199 107 111; 200 111 108; 201 111 110;202 75 112; 203 77 112; 204 112 78; 205 112 76; 206 87 113; 207 89 113;208 113 90; 209 113 88; 210 97 114; 211 99 114; 212 114 100; 213 114 98;START GROUP DEFINITIONMEMBER_FLOORBEAM 1 TO 19_MAINBT 20 TO 55_DIA-SIDE 56 TO 127_TOP-BEAM 128 TO 161_BOT-BRACE 180 TO 197_RAFTER 162 TO 179_TOP-BRACE 198 TO 213END GROUP DEFINITIONDEFINE MATERIAL STARTISOTROPIC STEELE 2.05e+008POISSON 0.3DENSITY 76.8195ALPHA 1.2e-005DAMP 0.03TYPE STEELSTRENGTH FY 253200 FU 407800 RY 1.5 RT 1.2END DEFINE MATERIALMEMBER PROPERTY BRITISH1 TO 19 TABLE ST UC305X305X97MEMBER PROPERTY AMERICAN20 TO 55 TABLE ST W27X129MEMBER PROPERTY CHINESE56 TO 127 TABLE ST PIP325X7.5MEMBER PROPERTY CHINESE162 TO 179 TABLE ST PIP133X5.0MEMBER PROPERTY CHINESE198 TO 213 TABLE ST PIP133X5.0MEMBER PROPERTY EUROPEAN180 TO 197 TABLE ST 200X8SHS128 TO 161 TABLE ST 500X300X20RHSCONSTANTSMATERIAL STEEL ALLSUPPORTS1 2 73 74 FIXED BUT FZ MX MY MZLOAD 1 LOADTYPE Dead TITLE DLMEMBER LOAD162 TO 179 UNI GY -31 TO 19 UNI GY -11.2520 TO 55 UNI GY -13.8SELFWEIGHT Y -1 LOAD 2 LOADTYPE Live TITLE LLMEMBER LOAD162 TO 179 UNI GY -1.51 TO 19 UNI GY -22.5LOAD 3 LOADTYPE Wind TITLE WLMEMBER LOAD162 TO 179 UNI GY 3LOAD 4 LOADTYPE None TITLE COLLISION LOADJOINT LOAD37 FX 50LOAD COMB 5 1DL+1LL1 1.0 2 1.0 LOAD COMB 6 1.35DL+1.5LL+0.75WL1 1.35 2 1.5 3 0.75 LOAD COMB 7 1.35DL+1.5WL+1.05LL1 1.35 3 1.5 2 1.05 LOAD COMB 8 1.35DL+1.5LL+1.05CL1 1.35 2 1.5 4 1.05 LOAD COMB 9 1.35DL+1.5CL+1.05LL1 1.35 4 1.5 2 1.05 PERFORM ANALYSISPARAMETER 1CODE EN 1993-1-1:2005PY 355000 MEMB 1 TO 205CHECK CODE MEMB _FLOORBEAMPARAMETER 3CODE EN 1993-1-1:2005CHECK CODE MEMB _DIA-SIDEPARAMETER 4CODE EN 1993-1-1:2005CHECK CODE MEMB _TOP-BEAMPARAMETER 5CODE EN 1993-1-1:2005CHECK CODE MEMB _BOT-BRACEPARAMETER 6CODE EN 1993-1-1:2005CHECK CODE MEMB _RAFTERPARAMETER 7CODE EN 1993-1-1:2005CHECK CODE MEMB _TOP-BRACEPARAMETER 8CODE EN 1993-1-1:2005UNL 1.5 MEMB 20 TO 55CHECK CODE MEMB 20 TO 55FINISH
The model has no restraint as far as translation in Z is concerned.
You may want to change the supports as shown next
SUPPORTS
*1 2 73 74 FIXED BUT FZ MX MY MZ
1 2 FIXED BUT MX MZ
73 74 FIXED BUT FZ MX MZ