AUTOSPC

Hi,
The below images are taken out from the "MSC NASTRAN - Linear Static and Normal Modes Analysis Version - 2017" course. Also i have pasted the .bdf file for this problem at the end.

I have the following question on this example problem.
1. I was thinking like this problem wont require to use Autospc=yes command inorder to run. Also there is no auto spc entry in the bdf file. Rotational moment about the y-aixs will be coupled out between the top and bottom layers of the constrained nodes !
2. in the gird point singularity table there are few notations, B F SB S - i was unable understand this notations. what thery are indicating? i was also run another simpler 3d model there i have seen the B F B F entries in the grid point singularity table. what they are indicating to us !
3. in the above same problem, PARAM SNORM 20. entry is used. whats the use of this entry ? (please refer below pasted .bdf texts)


$ NAS101 Workshop Examples
$ Section 5 Example 1
$ Revision 1. 17 May 00
SOL 101
TIME 600
CEND
TITLE = NAS101 Section 5 Example 1
ECHO = NONE
SUBCASE 1
SUBTITLE=tip load
SPC = 2
LOAD = 2
DISPLACEMENT(SORT1,REAL)=ALL
SPCFORCES(SORT1,REAL)=ALL
OLOAD(SORT1,REAL)=ALL
STRESS(SORT1,REAL,VONMISES,BILIN)=ALL
BEGIN BULK
PARAM POST 0
PARAM SNORM 20.
PSOLID 1 1 0
$ Solid Elements Follow:
CHEXA 1 1 1 2 13 12 122 123
134 133
CHEXA 2 1 2 3 14 13 123 124
135 134
CHEXA 3 1 3 4 15 14 124 125
136 135
CHEXA 4 1 4 5 16 15 125 126
137 136
CHEXA 5 1 5 6 17 16 126 127
138 137
CHEXA 6 1 6 7 18 17 127 128
139 138
CHEXA 7 1 7 8 19 18 128 129
140 139
CHEXA 8 1 8 9 20 19 129 130
141 140
CHEXA 9 1 9 10 21 20 130 131
142 141
CHEXA 10 1 10 11 22 21 131 132
143 142
CHEXA 11 1 12 13 24 23 133 134
145 144
CHEXA 12 1 13 14 25 24 134 135
146 145
CHEXA 13 1 14 15 26 25 135 136
147 146
CHEXA 14 1 15 16 27 26 136 137
148 147
CHEXA 15 1 16 17 28 27 137 138
149 148
CHEXA 16 1 17 18 29 28 138 139
150 149
CHEXA 17 1 18 19 30 29 139 140
151 150
CHEXA 18 1 19 20 31 30 140 141
152 151
CHEXA 19 1 20 21 32 31 141 142
153 152
CHEXA 20 1 21 22 33 32 142 143
154 153
CHEXA 21 1 23 24 35 34 144 145
156 155
CHEXA 22 1 24 25 36 35 145 146
157 156
CHEXA 23 1 25 26 37 36 146 147
158 157
CHEXA 24 1 26 27 38 37 147 148
159 158
CHEXA 25 1 27 28 39 38 148 149
160 159
CHEXA 26 1 28 29 40 39 149 150
161 160
CHEXA 27 1 29 30 41 40 150 151
162 161
CHEXA 28 1 30 31 42 41 151 152
163 162
CHEXA 29 1 31 32 43 42 152 153
164 163
CHEXA 30 1 32 33 44 43 153 154
165 164
CHEXA 31 1 34 35 46 45 155 156
167 166
CHEXA 32 1 35 36 47 46 156 157
168 167
CHEXA 33 1 36 37 48 47 157 158
169 168
CHEXA 34 1 37 38 49 48 158 159
170 169
CHEXA 35 1 38 39 50 49 159 160
171 170
CHEXA 36 1 39 40 51 50 160 161
172 171
CHEXA 37 1 40 41 52 51 161 162
173 172
CHEXA 38 1 41 42 53 52 162 163
174 173
CHEXA 39 1 42 43 54 53 163 164
175 174
CHEXA 40 1 43 44 55 54 164 165
176 175
CHEXA 41 1 45 46 57 56 166 167
178 177
CHEXA 42 1 46 47 58 57 167 168
179 178
CHEXA 43 1 47 48 59 58 168 169
180 179
CHEXA 44 1 48 49 60 59 169 170
181 180
CHEXA 45 1 49 50 61 60 170 171
182 181
CHEXA 46 1 50 51 62 61 171 172
183 182
CHEXA 47 1 51 52 63 62 172 173
184 183
CHEXA 48 1 52 53 64 63 173 174
185 184
CHEXA 49 1 53 54 65 64 174 175
186 185
CHEXA 50 1 54 55 66 65 175 176
187 186
CHEXA 51 1 56 57 68 67 177 178
189 188
CHEXA 52 1 57 58 69 68 178 179
190 189
CHEXA 53 1 58 59 70 69 179 180
191 190
CHEXA 54 1 59 60 71 70 180 181
192 191
CHEXA 55 1 60 61 72 71 181 182
193 192
CHEXA 56 1 61 62 73 72 182 183
194 193
CHEXA 57 1 62 63 74 73 183 184
195 194
CHEXA 58 1 63 64 75 74 184 185
196 195
CHEXA 59 1 64 65 76 75 185 186
197 196
CHEXA 60 1 65 66 77 76 186 187
198 197
CHEXA 61 1 67 68 79 78 188 189
200 199
CHEXA 62 1 68 69 80 79 189 190
201 200
CHEXA 63 1 69 70 81 80 190 191
202 201
CHEXA 64 1 70 71 82 81 191 192
203 202
CHEXA 65 1 71 72 83 82 192 193
204 203
CHEXA 66 1 72 73 84 83 193 194
205 204
CHEXA 67 1 73 74 85 84 194 195
206 205
CHEXA 68 1 74 75 86 85 195 196
207 206
CHEXA 69 1 75 76 87 86 196 197
208 207
CHEXA 70 1 76 77 88 87 197 198
209 208
CHEXA 71 1 78 79 90 89 199 200
211 210
CHEXA 72 1 79 80 91 90 200 201
212 211
CHEXA 73 1 80 81 92 91 201 202
213 212
CHEXA 74 1 81 82 93 92 202 203
214 213
CHEXA 75 1 82 83 94 93 203 204
215 214
CHEXA 76 1 83 84 95 94 204 205
216 215
CHEXA 77 1 84 85 96 95 205 206
217 216
CHEXA 78 1 85 86 97 96 206 207
218 217
CHEXA 79 1 86 87 98 97 207 208
219 218
CHEXA 80 1 87 88 99 98 208 209
220 219
CHEXA 81 1 89 90 101 100 210 211
222 221
CHEXA 82 1 90 91 102 101 211 212
223 222
CHEXA 83 1 91 92 103 102 212 213
224 223
CHEXA 84 1 92 93 104 103 213 214
225 224
CHEXA 85 1 93 94 105 104 214 215
226 225
CHEXA 86 1 94 95 106 105 215 216
227 226
CHEXA 87 1 95 96 107 106 216 217
228 227
CHEXA 88 1 96 97 108 107 217 218
229 228
CHEXA 89 1 97 98 109 108 218 219
230 229
CHEXA 90 1 98 99 110 109 219 220
231 230
CHEXA 91 1 100 101 112 111 221 222
233 232
CHEXA 92 1 101 102 113 112 222 223
234 233
CHEXA 93 1 102 103 114 113 223 224
235 234
CHEXA 94 1 103 104 115 114 224 225
236 235
CHEXA 95 1 104 105 116 115 225 226
237 236
CHEXA 96 1 105 106 117 116 226 227
238 237
CHEXA 97 1 106 107 118 117 227 228
239 238
CHEXA 98 1 107 108 119 118 228 229
240 239
CHEXA 99 1 108 109 120 119 229 230
241 240
CHEXA 100 1 109 110 121 120 230 231
242 241
$ Referenced Material Records
$ Material Record : steel
$ Description of Material : Date: 17-May-00 Time: 14:21:03
MAT1* 1 2.09+11 .3
*
$ Nodes of the Entire Model
GRID 1 0. 0. 0.
GRID 2 .1 0. 0.
GRID 3 .2 0. 0.
GRID 4 .3 0. 0.
GRID 5 .4 0. 0.
GRID 6 .5 0. 0.
GRID 7 .6 0. 0.
GRID 8 .7 0. 0.
GRID 9 .8 0. 0.
GRID 10 .9 0. 0.
GRID 11 1. 0. 0.
GRID 12 0. .1 0.
GRID 13 .1 .1 0.
GRID 14 .2 .1 0.
GRID 15 .3 .1 0.
GRID 16 .4 .1 0.
GRID 17 .5 .1 0.
GRID 18 .6 .1 0.
GRID 19 .7 .1 0.
GRID 20 .8 .1 0.
GRID 21 .9 .1 0.
GRID 22 1. .1 0.
GRID 23 0. .2 0.
GRID 24 .1 .2 0.
GRID 25 .2 .2 0.
GRID 26 .3 .2 0.
GRID 27 .4 .2 0.
GRID 28 .5 .2 0.
GRID 29 .6 .2 0.
GRID 30 .7 .2 0.
GRID 31 .8 .2 0.
GRID 32 .9 .2 0.
GRID 33 1. .2 0.
GRID 34 0. .3 0.
GRID 35 .1 .3 0.
GRID 36 .2 .3 0.
GRID 37 .3 .3 0.
GRID 38 .4 .3 0.
GRID 39 .5 .3 0.
GRID 40 .6 .3 0.
GRID 41 .7 .3 0.
GRID 42 .8 .3 0.
GRID 43 .9 .3 0.
GRID 44 1. .3 0.
GRID 45 0. .4 0.
GRID 46 .1 .4 0.
GRID 47 .2 .4 0.
GRID 48 .3 .4 0.
GRID 49 .4 .4 0.
GRID 50 .5 .4 0.
GRID 51 .6 .4 0.
GRID 52 .7 .4 0.
GRID 53 .8 .4 0.
GRID 54 .9 .4 0.
GRID 55 1. .4 0.
GRID 56 0. .5 0.
GRID 57 .1 .5 0.
GRID 58 .2 .5 0.
GRID 59 .3 .5 0.
GRID 60 .4 .5 0.
GRID 61 .5 .5 0.
GRID 62 .6 .5 0.
GRID 63 .7 .5 0.
GRID 64 .8 .5 0.
GRID 65 .9 .5 0.
GRID 66 1. .5 0.
GRID 67 0. .6 0.
GRID 68 .1 .6 0.
GRID 69 .2 .6 0.
GRID 70 .3 .6 0.
GRID 71 .4 .6 0.
GRID 72 .5 .6 0.
GRID 73 .6 .6 0.
GRID 74 .7 .6 0.
GRID 75 .8 .6 0.
GRID 76 .9 .6 0.
GRID 77 1. .6 0.
GRID 78 0. .7 0.
GRID 79 .1 .7 0.
GRID 80 .2 .7 0.
GRID 81 .3 .7 0.
GRID 82 .4 .7 0.
GRID 83 .5 .7 0.
GRID 84 .6 .7 0.
GRID 85 .7 .7 0.
GRID 86 .8 .7 0.
GRID 87 .9 .7 0.
GRID 88 1. .7 0.
GRID 89 0. .8 0.
GRID 90 .1 .8 0.
GRID 91 .2 .8 0.
GRID 92 .3 .8 0.
GRID 93 .4 .8 0.
GRID 94 .5 .8 0.
GRID 95 .6 .8 0.
GRID 96 .7 .8 0.
GRID 97 .8 .8 0.
GRID 98 .9 .8 0.
GRID 99 1. .8 0.
GRID 100 0. .9 0.
GRID 101 .1 .9 0.
GRID 102 .2 .9 0.
GRID 103 .3 .9 0.
GRID 104 .4 .9 0.
GRID 105 .5 .9 0.
GRID 106 .6 .9 0.
GRID 107 .7 .9 0.
GRID 108 .8 .9 0.
GRID 109 .9 .9 0.
GRID 110 1. .9 0.
GRID 111 0. 1. 0.
GRID 112 .1 1. 0.
GRID 113 .2 1. 0.
GRID 114 .3 1. 0.
GRID 115 .4 1. 0.
GRID 116 .5 1. 0.
GRID 117 .6 1. 0.
GRID 118 .7 1. 0.
GRID 119 .8 1. 0.
GRID 120 .9 1. 0.
GRID 121 1. 1. 0.
GRID 122 0. 0. .1
GRID 123 .1 0. .1
GRID 124 .2 0. .1
GRID 125 .3 0. .1
GRID 126 .4 0. .1
GRID 127 .5 0. .1
GRID 128 .6 0. .1
GRID 129 .7 0. .1
GRID 130 .8 0. .1
GRID 131 .9 0. .1
GRID 132 1. 0. .1
GRID 133 0. .1 .1
GRID 134 .1 .1 .1
GRID 135 .2 .1 .1
GRID 136 .3 .1 .1
GRID 137 .4 .1 .1
GRID 138 .5 .1 .1
GRID 139 .6 .1 .1
GRID 140 .7 .1 .1
GRID 141 .8 .1 .1
GRID 142 .9 .1 .1
GRID 143 1. .1 .1
GRID 144 0. .2 .1
GRID 145 .1 .2 .1
GRID 146 .2 .2 .1
GRID 147 .3 .2 .1
GRID 148 .4 .2 .1
GRID 149 .5 .2 .1
GRID 150 .6 .2 .1
GRID 151 .7 .2 .1
GRID 152 .8 .2 .1
GRID 153 .9 .2 .1
GRID 154 1. .2 .1
GRID 155 0. .3 .1
GRID 156 .1 .3 .1
GRID 157 .2 .3 .1
GRID 158 .3 .3 .1
GRID 159 .4 .3 .1
GRID 160 .5 .3 .1
GRID 161 .6 .3 .1
GRID 162 .7 .3 .1
GRID 163 .8 .3 .1
GRID 164 .9 .3 .1
GRID 165 1. .3 .1
GRID 166 0. .4 .1
GRID 167 .1 .4 .1
GRID 168 .2 .4 .1
GRID 169 .3 .4 .1
GRID 170 .4 .4 .1
GRID 171 .5 .4 .1
GRID 172 .6 .4 .1
GRID 173 .7 .4 .1
GRID 174 .8 .4 .1
GRID 175 .9 .4 .1
GRID 176 1. .4 .1
GRID 177 0. .5 .1
GRID 178 .1 .5 .1
GRID 179 .2 .5 .1
GRID 180 .3 .5 .1
GRID 181 .4 .5 .1
GRID 182 .5 .5 .1
GRID 183 .6 .5 .1
GRID 184 .7 .5 .1
GRID 185 .8 .5 .1
GRID 186 .9 .5 .1
GRID 187 1. .5 .1
GRID 188 0. .6 .1
GRID 189 .1 .6 .1
GRID 190 .2 .6 .1
GRID 191 .3 .6 .1
GRID 192 .4 .6 .1
GRID 193 .5 .6 .1
GRID 194 .6 .6 .1
GRID 195 .7 .6 .1
GRID 196 .8 .6 .1
GRID 197 .9 .6 .1
GRID 198 1. .6 .1
GRID 199 0. .7 .1
GRID 200 .1 .7 .1
GRID 201 .2 .7 .1
GRID 202 .3 .7 .1
GRID 203 .4 .7 .1
GRID 204 .5 .7 .1
GRID 205 .6 .7 .1
GRID 206 .7 .7 .1
GRID 207 .8 .7 .1
GRID 208 .9 .7 .1
GRID 209 1. .7 .1
GRID 210 0. .8 .1
GRID 211 .1 .8 .1
GRID 212 .2 .8 .1
GRID 213 .3 .8 .1
GRID 214 .4 .8 .1
GRID 215 .5 .8 .1
GRID 216 .6 .8 .1
GRID 217 .7 .8 .1
GRID 218 .8 .8 .1
GRID 219 .9 .8 .1
GRID 220 1. .8 .1
GRID 221 0. .9 .1
GRID 222 .1 .9 .1
GRID 223 .2 .9 .1
GRID 224 .3 .9 .1
GRID 225 .4 .9 .1
GRID 226 .5 .9 .1
GRID 227 .6 .9 .1
GRID 228 .7 .9 .1
GRID 229 .8 .9 .1
GRID 230 .9 .9 .1
GRID 231 1. .9 .1
GRID 232 0. 1. .1
GRID 233 .1 1. .1
GRID 234 .2 1. .1
GRID 235 .3 1. .1
GRID 236 .4 1. .1
GRID 237 .5 1. .1
GRID 238 .6 1. .1
GRID 239 .7 1. .1
GRID 240 .8 1. .1
GRID 241 .9 1. .1
GRID 242 1. 1. .1
$ Loads for Load Case : tip load
SPCADD 2 1
LOAD 2 1. 1. 1
$ Displacement Constraints of Load Set : fixed
SPC1 1 123 1 12 23 34 45 56
67 78 89 100 111 122 133 144
155 166 177 188 199 210 221 232
$ Nodal Forces of Load Set : point
FORCE 1 187 0 1000. 0. 0. -1.
$ Referenced Coordinate Frames
ENDDATA 2ddcbf21


Thanks and regards,
Thanga Pndiyan.