***warning   -   instability at joint 73    direction=fz
probable cause singular-adding weak spring
k-matrix diag=xxxxxxxxx    L-matrix diag=xxxxxxxxxxx   EQN   NO    XX
***note   -   very weak  spring added for stability

我所建的模型为输电线路塔架的模型！模型中所有构件都定义为桁架，对于整个空间桁架而言，我将构件截面一直增大都不能解决这个警告问题，这是为什么呢？

警告的弱节点位于纵杆与支撑的交点处，但该点并不位于纵杆端点！！！

Z向为沿杆的方向哦！

为什么总是会提示“有一条或多条线太长而将被分成2段啊？

你把那个支座改成固结的支座，再释放相应的杆端约束试试

当全部杆件为桁架杆时，如果一个节的只在X Y平面内有杆件时，就会造成Z方向确实约束的警告。
“有一条或多条线太长而将被分成2段”的问题，如果数据是用其它软件形成的，往往是说单行的数据太多了，被分成了两行数据。如果希望别人能给出更准确、全面的建议，最好上传std文件。

以下是我建立的模型，现构件端部全部按固结考虑，支座为铰接支座。
请帮我看看为什么会出现“有一条或多条线太长而将被分成2段”的问题的问题哦！！谢谢啦
STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 23-Apr-10
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 -2.2025 -2.2025 0; 2 -2.2025 2.2025 0; 3 -0.459902 0.460001 18.5;
4 -0.45985 -0.460001 18.5; 5 0.4601 0.460001 18.5; 6 0.460152 -0.460001 18.5;
7 2.2025 2.2025 0; 8 2.203 -2.2025 0; 9 -0.555744 -0.555887 17.482;
10 0.555744 -0.555887 17.482; 11 -0.555744 0.555887 17.482;
12 0.555744 0.555887 17.482; 13 -0.507797 -0.507944 17.991;
15 -0.507797 0.507944 17.991; 17 0.460126 0 18.5; 18 -0.459876 0 18.5;
19 -0.649116 -0.649251 16.4908; 20 0.649144 -0.649251 16.4908;
21 -0.649116 0.649251 16.4908; 22 0.649116 0.649251 16.4908;
23 -0.742489 -0.742616 15.4995; 24 0.742545 -0.742615 15.4995;
25 -0.742489 0.742615 15.4995; 26 0.742489 0.742615 15.4995;
27 -0.835862 -0.83598 14.5083; 28 0.835946 -0.835979 14.5083;
29 -0.835861 0.83598 14.5083; 30 0.835861 0.83598 14.5083;
31 -0.938571 -0.938681 13.4179; 32 0.938686 -0.93868 13.4179;
33 -0.938571 0.938681 13.4179; 34 0.938571 0.938681 13.4179;
35 -1.06378 -1.06388 12.0887; 36 1.06394 -1.06388 12.0887;
37 -1.06378 1.06388 12.0887; 38 1.06378 1.06388 12.0887;
39 -1.20384 -1.20393 10.6018; 40 1.20404 -1.20393 10.6018;
41 -1.20384 1.20393 10.6018; 42 1.20384 1.20393 10.6018;
43 -1.3439 -1.34398 9.11494; 44 1.34414 -1.34397 9.11496;
45 -1.3439 1.34398 9.11494; 46 1.3439 1.34398 9.11494;
47 -1.48396 -1.48402 7.62807; 48 1.48424 -1.48402 7.6281;
49 -1.48396 1.48402 7.62807; 50 1.48396 1.48402 7.62807;
51 -1.62953 -1.62958 6.08272; 52 1.62985 -1.62957 6.08275;
53 -1.62953 1.62958 6.08272; 54 1.62953 1.62958 6.08272;
55 -1.81627 -1.81631 4.10023; 56 1.81665 -1.8163 4.10027;
57 -1.81627 1.81631 4.10023; 58 1.81627 1.81631 4.10023;
59 -1.90965 -1.90967 3.10899; 60 1.91005 -1.90967 3.10903;
61 -1.90965 1.90967 3.10899; 62 1.90965 1.90967 3.10899;
63 -2.0497 -2.04972 1.62212; 64 2.05015 -2.04971 1.62217;
65 -2.0497 2.04972 1.62212; 66 2.0497 2.04972 1.62212; 67 0 1.90967 3.10899;
68 0.00020367 -1.90967 3.10901; 69 -1.10125 2.05609 1.5545;
70 1.10125 2.05609 1.5545; 71 -1.10115 -2.05609 1.5545;
72 1.1016 -2.05609 1.5545; 73 -0.60243 -0.602569 16.9864;
74 -0.60243 0.602569 16.9864; 75 -0.695803 -0.695933 15.9952;
76 -0.695803 0.695933 15.9952; 77 -0.742489 -9.68935e-008 15.4995;
78 -0.793844 -0.793966 14.9544; 79 -0.793844 0.793966 14.9544;
80 -0.887216 -0.887331 13.9631; 81 -0.887216 0.88733 13.9631;
82 -0.999263 -0.999368 12.7736; 83 -0.999263 0.999368 12.7736;
84 -0.939913 4.30758e-007 13.4037; 85 -1.13381 -1.13391 11.3452;
86 -1.13381 1.13391 11.3452; 87 -1.27387 -1.27395 9.85837;
88 -1.27387 1.27395 9.85837; 89 -1.41393 -1.414 8.3715;
90 -1.41393 1.414 8.3715; 91 -1.7229 -1.72294 5.09148;
92 -1.7229 1.72294 5.09148; 93 -1.55674 -1.5568 6.8554;
94 -1.55674 1.5568 6.8554; 95 -1.63561 -4.16893e-008 6.01811;
96 0.507797 -0.507944 17.991; 97 0.507797 0.507944 17.991;
98 0.60243 -0.602569 16.9864; 99 0.60243 0.602569 16.9864;
100 0.695803 -0.695933 15.9952; 101 0.695803 0.695933 15.9952;
102 0.793844 -0.793966 14.9544; 103 0.793844 0.793966 14.9544;
104 0.887216 -0.887331 13.9631; 105 0.887216 0.88733 13.9631;
106 0.999263 -0.999368 12.7736; 107 0.999263 0.999368 12.7736;
108 1.13381 -1.13391 11.3452; 109 1.13381 1.13391 11.3452;
110 1.27387 -1.27395 9.85837; 111 1.27387 1.27395 9.85837;
112 1.41393 -1.414 8.3715; 113 1.41393 1.414 8.3715;
114 1.7229 -1.72294 5.09148; 115 1.7229 1.72294 5.09148;
116 1.55674 -1.5568 6.8554; 117 1.55674 1.5568 6.8554;
118 0.742489 -9.68935e-008 15.4995; 119 0.939913 4.30758e-007 13.4037;
120 1.63561 -4.16893e-008 6.01811; 121 -1.90965 0 3.10899;
122 1.90985 0 3.10901; 123 -2.05608 1.10125 1.55449;
124 -2.05608 -1.10125 1.55449; 125 2.05608 1.10125 1.55449;
126 2.05608 -1.10125 1.55449;
MEMBER INCIDENCES
30 5 17; 32 3 18; 34 3 5; 36 4 6; 40 4 13; 41 9 73; 45 11 74; 48 13 9; 51 3 15;
52 15 11; 55 17 6; 56 18 4; 57 15 18; 58 18 13; 59 11 5; 60 12 3; 61 19 75;
63 21 76; 65 11 22; 66 12 21; 67 9 6; 68 10 4; 69 10 19; 70 9 20; 71 23 78;
73 25 79; 75 27 80; 77 29 81; 79 21 26; 80 22 25; 81 25 30; 82 26 29; 83 19 24;
84 20 23; 85 23 28; 86 24 27; 87 31 82; 89 33 83; 91 30 33; 92 29 34; 93 28 31;
94 27 32; 95 35 85; 97 37 86; 99 33 38; 100 34 37; 101 31 36; 102 32 35;
103 39 87; 105 41 88; 107 43 89; 109 45 90; 111 47 93; 113 49 94; 115 38 41;
116 37 42; 117 42 45; 118 41 46; 119 46 49; 120 45 50; 121 36 39; 122 35 40;
123 40 43; 124 39 44; 125 44 47; 126 43 48; 127 51 91; 129 53 92; 131 50 53;
132 49 54; 133 48 51; 134 47 52; 135 55 59; 137 57 61; 139 59 63; 141 61 65;
143 63 1; 145 65 2; 147 54 57; 148 53 58; 149 61 67; 150 51 56; 151 52 55;
152 59 68; 153 67 62; 154 68 60; 155 67 57; 156 67 58; 157 68 55; 158 68 56;
159 2 69; 160 67 70; 161 1 71; 162 68 72; 163 69 67; 164 70 7; 165 71 68;
166 72 8; 167 70 66; 168 69 65; 169 71 63; 170 72 64; 171 25 26; 172 23 24;
173 25 77; 175 5 4; 176 6 3; 177 73 19; 178 74 21; 179 75 23; 180 76 25;
181 15 73; 182 74 13; 183 74 75; 184 76 73; 185 77 23; 187 76 77; 188 77 75;
189 78 27; 190 79 29; 191 77 78; 192 77 79; 193 80 31; 194 81 33; 195 79 80;
196 81 78; 197 34 33; 198 32 31; 199 82 35; 200 83 37; 201 81 84; 202 80 84;
203 84 82; 204 84 83; 205 33 84; 206 84 31; 207 85 39; 208 86 41; 209 83 85;
210 82 86; 211 87 43; 212 88 45; 213 89 47; 214 90 49; 215 85 88; 216 86 87;
217 87 90; 218 88 89; 219 54 53; 220 52 51; 221 91 55; 222 92 57; 223 93 51;
224 94 53; 225 89 94; 226 90 93; 227 94 95; 228 93 95; 229 61 121; 230 59 92;
231 91 61; 232 95 91; 233 95 92; 234 53 95; 235 95 51; 236 6 96; 237 10 98;
238 12 99; 239 96 10; 240 5 97; 241 97 12; 242 20 100; 243 22 101; 244 24 102;
245 26 103; 246 28 104; 247 30 105; 248 32 106; 249 34 107; 250 36 108;
251 38 109; 252 40 110; 253 42 111; 254 44 112; 255 46 113; 256 48 116;
257 50 117; 258 52 114; 259 54 115; 260 56 60; 261 58 62; 262 60 64; 263 62 66;
264 64 8; 265 66 7; 266 98 20; 267 99 22; 268 100 24; 269 101 26; 270 102 28;
271 103 30; 272 104 32; 273 105 34; 274 106 36; 275 107 38; 276 108 40;
277 109 42; 278 110 44; 279 111 46; 280 112 48; 281 113 50; 282 114 56;
283 115 58; 284 116 52; 285 117 54; 286 97 17; 287 17 96; 288 26 118;
289 97 98; 290 99 96; 291 99 100; 292 101 98; 293 118 24; 294 101 118;
295 118 100; 296 118 102; 297 118 103; 298 103 104; 299 105 102; 300 105 119;
301 104 119; 302 119 106; 303 119 107; 304 34 119; 305 119 32; 306 107 108;
307 106 109; 308 108 111; 309 109 110; 310 110 113; 311 111 112; 312 112 117;
313 113 116; 314 117 120; 315 116 120; 316 62 122; 317 60 115; 318 114 62;
319 120 114; 320 120 115; 321 54 120; 322 120 52; 323 121 59; 324 122 60;
325 2 123; 326 1 124; 327 123 121; 328 124 121; 329 65 123; 330 124 63;
331 7 125; 332 8 126; 333 125 122; 334 126 122; 335 66 125; 336 126 64;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 1.99947e+008
POISSON 0.3
DENSITY 76.8191
ALPHA 6.5e-006
DAMP 0.03
END DEFINE MATERIAL
MEMBER PROPERTY CHINESE
30 32 34 36 40 41 45 48 51 52 55 TO 61 63 65 TO 71 73 75 77 79 TO 87 89 91 -
92 TO 95 97 99 TO 103 105 107 109 111 113 115 TO 127 129 131 TO 135 137 139 -
141 143 145 147 TO 173 175 TO 185 187 TO 336 TABLE ST L100X100X6
CONSTANTS
MATERIAL STEEL MEMB 30 32 34 36 40 41 45 48 51 52 55 TO 61 63 65 TO 71 73 -
75 77 79 TO 87 89 91 TO 95 97 99 TO 103 105 107 109 111 113 115 TO 127 129 -
131 TO 135 137 139 141 143 145 147 TO 173 175 TO 185 187 TO 336
SUPPORTS
1 2 7 8 PINNED
DEFINE WIND LOAD
TYPE 1
INT 0.537639 0.537639 0.54545 0.55265 0.559342 0.565606 0.571501 0.577076 -
0.582369 0.587412 0.592232 0.596852 0.60129 0.605562 0.609682 HEIG  0  4.57201 -
5.15816  5.74432  6.33047  6.91663  7.50278  8.08894  8.67509  9.26125  9.8474 -
10.4336  11.0197  11.6059  12.192
LOAD 1 LOADTYPE None  TITLE LOAD CASE 1
MEMBER LOAD
30 32 34 36 40 41 45 48 51 52 55 TO 61 63 65 TO 71 73 75 77 79 TO 87 89 91 -
92 TO 95 97 99 TO 103 105 107 109 111 113 115 TO 127 129 131 TO 135 137 139 -
141 143 145 147 TO 173 175 TO 185 187 TO 336 UNI GZ 0.03
SELFWEIGHT Z -1
PERFORM ANALYSIS PRINT LOAD DATA
FINISH