Greetings all!
I am designing a truss of 91m clear span and 25m height. I just want to confirm if my design is okay or not.
Some of the members are failed. I will pass these members and proceed for fabrication but before that I want to know if my mechanism is correct or any modification is required in my model.
If anyone can suggest me how to optimize the weight of truss, that would be great.
Also for the top chord of truss at eave location, I have considered the connection to be fixed with column. Is this okay.
Mt model input file is follows...
STAAD PLANE
START JOB INFORMATION
ENGINEER DATE 18-Sep-17
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 2.2 0 0; 3 3.7 0 0; 4 5.2 0 0; 5 6.7 0 0; 6 8.2 0 0; 7 9.7 0 0;
8 11.2 0 0; 9 12.7 0 0; 10 14.2 0 0; 11 15.7 0 0; 12 17.2 0 0; 13 18.7 0 0;
14 20.2 0 0; 15 21.7 0 0; 16 23.2 0 0; 17 24.7 0 0; 18 26.2 0 0; 19 27.7 0 0;
20 29.2 0 0; 21 30.7 0 0; 22 32.2 0 0; 23 33.7 0 0; 24 35.2 0 0; 25 36.7 0 0;
26 38.2 0 0; 27 39.7 0 0; 28 41.2 0 0; 29 42.7 0 0; 30 44.2 0 0; 31 45.7 0 0;
32 47.2 0 0; 33 48.7 0 0; 34 50.2 0 0; 35 51.7 0 0; 36 53.2 0 0; 37 54.7 0 0;
38 56.2 0 0; 39 57.7 0 0; 40 59.2 0 0; 41 60.7 0 0; 42 62.2 0 0; 43 63.7 0 0;
44 65.2 0 0; 45 66.7 0 0; 46 68.2 0 0; 47 69.7 0 0; 48 71.2 0 0; 49 72.7 0 0;
50 74.2 0 0; 51 75.7 0 0; 52 77.2 0 0; 53 78.7 0 0; 54 80.2 0 0; 55 81.7 0 0;
56 83.2 0 0; 57 84.7 0 0; 58 86.2 0 0; 59 87.7 0 0; 60 89.2 0 0; 61 91.4 0 0;
62 2.2 0.11 0; 63 3.7 0.185 0; 64 5.2 0.26 0; 65 6.7 0.335 0; 66 8.2 0.41 0;
67 9.7 0.485 0; 68 11.2 0.56 0; 69 12.7 0.635 0; 70 14.2 0.71 0;
71 15.7 0.785 0; 72 17.2 0.86 0; 73 18.7 0.935 0; 74 20.2 1.01 0;
75 21.7 1.085 0; 76 23.2 1.16 0; 77 24.7 1.235 0; 78 26.2 1.31 0;
79 27.7 1.385 0; 80 29.2 1.46 0; 81 30.7 1.535 0; 82 32.2 1.61 0;
83 33.7 1.685 0; 84 35.2 1.76 0; 85 36.7 1.835 0; 86 38.2 1.91 0;
87 39.7 1.985 0; 88 41.2 2.06 0; 89 42.7 2.135 0; 90 44.2 2.21 0;
91 45.7 2.285 0; 92 47.2 2.21 0; 93 48.7 2.135 0; 94 50.2 2.06 0;
95 51.7 1.985 0; 96 53.2 1.91 0; 97 54.7 1.835 0; 98 56.2 1.76 0;
99 57.7 1.685 0; 100 59.2 1.61 0; 101 60.7 1.535 0; 102 62.2 1.46 0;
103 63.7 1.385 0; 104 65.2 1.31 0; 105 66.7 1.235 0; 106 68.2 1.16 0;
107 69.7 1.085 0; 108 71.2 1.01 0; 109 72.7 0.935 0; 110 74.2 0.86 0;
111 75.7 0.785 0; 112 77.2 0.71 0; 113 78.7 0.635 0; 114 80.2 0.56 0;
115 81.7 0.485 0; 116 83.2 0.41 0; 117 84.7 0.335 0; 118 86.2 0.26 0;
119 87.7 0.185 0; 120 89.2 0.11 0; 121 0 -25 0; 122 91.4 -25 0;
MEMBER INCIDENCES
1 1 2; 2 2 3; 3 3 4; 4 4 5; 5 5 6; 6 6 7; 7 7 8; 8 8 9; 9 9 10; 10 10 11;
11 11 12; 12 12 13; 13 13 14; 14 14 15; 15 15 16; 16 16 17; 17 17 18; 18 18 19;
19 19 20; 20 20 21; 21 21 22; 22 22 23; 23 23 24; 24 24 25; 25 25 26; 26 26 27;
27 27 28; 28 28 29; 29 29 30; 30 30 31; 31 31 32; 32 32 33; 33 33 34; 34 34 35;
35 35 36; 36 36 37; 37 37 38; 38 38 39; 39 39 40; 40 40 41; 41 41 42; 42 42 43;
43 43 44; 44 44 45; 45 45 46; 46 46 47; 47 47 48; 48 48 49; 49 49 50; 50 50 51;
51 51 52; 52 52 53; 53 53 54; 54 54 55; 55 55 56; 56 56 57; 57 57 58; 58 58 59;
59 59 60; 60 60 61; 61 1 62; 62 62 63; 63 63 64; 64 64 65; 65 65 66; 66 66 67;
67 67 68; 68 68 69; 69 69 70; 70 70 71; 71 71 72; 72 72 73; 73 73 74; 74 74 75;
75 75 76; 76 76 77; 77 77 78; 78 78 79; 79 79 80; 80 80 81; 81 81 82; 82 82 83;
83 83 84; 84 84 85; 85 85 86; 86 86 87; 87 87 88; 88 88 89; 89 89 90; 90 90 91;
91 91 92; 92 92 93; 93 93 94; 94 94 95; 95 95 96; 96 96 97; 97 97 98; 98 98 99;
99 99 100; 100 100 101; 101 101 102; 102 102 103; 103 103 104; 104 104 105;
105 105 106; 106 106 107; 107 107 108; 108 108 109; 109 109 110; 110 110 111;
111 111 112; 112 112 113; 113 113 114; 114 114 115; 115 115 116; 116 116 117;
117 117 118; 118 118 119; 119 119 120; 120 120 61; 121 2 62; 122 3 63;
123 4 64; 124 5 65; 125 6 66; 126 7 67; 127 8 68; 128 9 69; 129 10 70;
130 11 71; 131 12 72; 132 13 73; 133 14 74; 134 15 75; 135 16 76; 136 17 77;
137 18 78; 138 19 79; 139 20 80; 140 21 81; 141 22 82; 142 23 83; 143 24 84;
144 25 85; 145 26 86; 146 27 87; 147 28 88; 148 29 89; 149 30 90; 150 31 91;
151 32 92; 152 33 93; 153 34 94; 154 35 95; 155 36 96; 156 37 97; 157 38 98;
158 39 99; 159 40 100; 160 41 101; 161 42 102; 162 43 103; 163 44 104;
164 45 105; 165 46 106; 166 47 107; 167 48 108; 168 49 109; 169 50 110;
170 51 111; 171 52 112; 172 53 113; 173 54 114; 174 55 115; 175 56 116;
176 57 117; 177 58 118; 178 59 119; 179 60 120; 180 3 62; 181 4 63; 182 5 64;
183 6 65; 184 7 66; 185 8 67; 186 9 68; 187 10 69; 188 11 70; 189 12 71;
190 13 72; 191 14 73; 192 15 74; 193 16 75; 194 17 76; 195 18 77; 196 19 78;
197 20 79; 198 21 80; 199 22 81; 200 23 82; 201 24 83; 202 25 84; 203 26 85;
204 27 86; 205 28 87; 206 29 88; 207 30 89; 208 31 90; 209 31 92; 210 32 93;
211 33 94; 212 34 95; 213 35 96; 214 36 97; 215 37 98; 216 38 99; 217 39 100;
218 40 101; 219 41 102; 220 42 103; 221 43 104; 222 44 105; 223 45 106;
224 46 107; 225 47 108; 226 48 109; 227 49 110; 228 50 111; 229 51 112;
230 52 113; 231 53 114; 232 54 115; 233 55 116; 234 56 117; 235 57 118;
236 58 119; 237 59 120; 238 121 1; 239 122 61;
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
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
238 239 TAPERED 2.04 0.016 2.04 0.5 0.02
61 TO 120 TAPERED 2.08 0.016 2.08 0.6 0.04
180 TO 237 TAPERED 0.5 0.005 0.5 0.15 0.006
121 TO 179 TAPERED 0.466 0.005 0.466 0.225 0.01
MEMBER PROPERTY
1 TO 60 TAPERED 2.06 0.016 2.06 0.6 0.03
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
121 122 FIXED
MEMBER RELEASE
1 TO 60 62 TO 119 121 TO 237 START MPZ 0.999
1 TO 60 62 TO 119 121 TO 237 END MPZ 0.999999
DEFINE IBC 2006
SS 0.364 S1 0.13 I 1 RX 3.5 RZ 3.5 SCLASS 4 TL 6
SELFWEIGHT 1
MEMBER WEIGHT
61 TO 120 UNI 1.65
LOAD 1 LOADTYPE Seismic TITLE EQX
IBC LOAD X 1
PERFORM ANALYSIS
CHANGE
LOAD 2 LOADTYPE Seismic TITLE EQX'
IBC LOAD X -1
PERFORM ANALYSIS
CHANGE
LOAD 3 LOADTYPE Dead TITLE DL
SELFWEIGHT Y -1
MEMBER LOAD
61 TO 120 UNI GY -1.65
LOAD 4 LOADTYPE Live TITLE LL
MEMBER LOAD
61 TO 120 UNI GY -4.7
LOAD 5 LOADTYPE Wind TITLE W1
MEMBER LOAD
238 UNI GX 10.904 2.5 25
61 TO 120 UNI GY 9.541
239 UNI GX 6.815 2.5 25
LOAD 6 LOADTYPE Wind TITLE W2
MEMBER LOAD
238 UNI GX 6.815 2.5 25
61 TO 120 UNI GY 9.541
239 UNI GX 10.904 2.5 25
LOAD 7 LOADTYPE Wind TITLE W3
MEMBER LOAD
238 UNI GX 9.541 2.5 25
61 TO 120 UNI GY 9.541
239 UNI GY 9.541 2.5 25
LOAD COMB 8 GENERATED AISC GENERAL 1
3 1.0
LOAD COMB 9 GENERATED AISC GENERAL 2
3 1.0 4 1.0
LOAD COMB 10 GENERATED AISC GENERAL 3
3 1.0 4 0.75
LOAD COMB 11 GENERATED AISC GENERAL 4
3 1.0 5 1.0
LOAD COMB 12 GENERATED AISC GENERAL 5
3 1.0 6 1.0
LOAD COMB 13 GENERATED AISC GENERAL 6
3 1.0 7 1.0
LOAD COMB 14 GENERATED AISC GENERAL 7
3 1.0 1 0.7
LOAD COMB 15 GENERATED AISC GENERAL 8
3 1.0 2 0.7
LOAD COMB 16 GENERATED AISC GENERAL 9
3 1.0 1 -0.7
LOAD COMB 17 GENERATED AISC GENERAL 10
3 1.0 2 -0.7
LOAD COMB 18 GENERATED AISC GENERAL 11
3 1.0 4 0.75 5 0.75
LOAD COMB 19 GENERATED AISC GENERAL 12
3 1.0 4 0.75 6 0.75
LOAD COMB 20 GENERATED AISC GENERAL 13
3 1.0 4 0.75 7 0.75
LOAD COMB 21 GENERATED AISC GENERAL 14
3 1.0 4 0.75 1 0.525
LOAD COMB 22 GENERATED AISC GENERAL 15
3 1.0 4 0.75 2 0.525
LOAD COMB 23 GENERATED AISC GENERAL 16
3 1.0 4 0.75 1 -0.525
LOAD COMB 24 GENERATED AISC GENERAL 17
3 1.0 4 0.75 2 -0.525
LOAD COMB 25 GENERATED AISC GENERAL 18
3 0.6 5 1.0
LOAD COMB 26 GENERATED AISC GENERAL 19
3 0.6 6 1.0
LOAD COMB 27 GENERATED AISC GENERAL 20
3 0.6 7 1.0
LOAD COMB 28 GENERATED AISC GENERAL 21
3 0.6 1 0.7
LOAD COMB 29 GENERATED AISC GENERAL 22
3 0.6 2 0.7
LOAD COMB 30 GENERATED AISC GENERAL 23
3 0.6 1 -0.7
LOAD COMB 31 GENERATED AISC GENERAL 24
3 0.6 2 -0.7
PERFORM ANALYSIS PRINT ALL
PARAMETER 1
CODE AISC UNIFIED 2005
MAIN 200 MEMB 121 TO 179 238 239
METHOD ASD
STP 2 ALL
UNT 1.5 MEMB 61 TO 120
LY 2.5 MEMB 238 239
UNB 2.5 MEMB 238 239
UNT 2.5 MEMB 238 239
CHECK CODE ALL
PARAMETER 2
CODE AISC UNIFIED 2005
STEEL MEMBER TAKE OFF ALL
PARAMETER 3
CODE AISC UNIFIED 2005
STEEL TAKE OFF ALL
FINISH