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This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) BS 5950: Part 1: 2000: Section three Table 12. Limiting width-to-thickness ratios for CHS and RHS Compression element Ratio a Extracts from BS 5950: Part 1 1223 Limiting value b Class 1 Class 2 Class 3 plastic compact semi-compact CHS Compression due to bending D/t 40e 2 50e 2 Axial compression D/t Not applicable Not applicable 80e 2 140e 2 HF Flange Compression due b/t 28e 32e RHS to bending but £80e - d/t but £62e - 0.5d/t 40e Axial compression b/t Not applicable Not applicable Web Neutral axis at mid-depth d/t 64e 80e 120e Generallycd d/t but ≥40e but ≥40e but ≥40e Axial compressiond 64e 80e 120e 1+ 0. 6r1 1+ r1 1+ 2r2 d/t Not applicable Not applicable CF Flange Compression due b/t 26e 28e RHS to bending but £72e - d/t but £54e - 0.5d/t 35e Axial compressiond b/t Not applicable Not applicable Neutral axis at mid-depth d/t 56e 70e 105e Generallycd d/t but ≥35e but ≥35e but ≥35e Axial compressiond 56e 70e 105e 1+ 0. 6r1 1+ r1 1+ 2r2 d/t Not applicable Not applicable Abbreviations CF Cold-formed; CHS Circular hollow section – including welded tube; HF Hot-finished; RHS Rectangular hollow section – including square hollow section. a For an RHS, the dimensions b and d should be taken as follows: – for HF RHS to BS EN 10210: b = B - 3t: d = D - 3t – for CF RHS to BS EN 10219: b = B - 5t: d = D - 5t and B, D and t are as defined in Figure 5 of BS 5950-1. For an RHS subject to bending B and b are always flange dimensions and D and d are always web dimensions, but the definition of which sides of the RHS are webs and which are flanges changes according to the axis of bending: see clause 3.5.1. b The parameter e = (275/py) 0.5 . c For RHS subject to moments about both axes see H.3. d The stress rations r1 and r2 are defined in clause 3.5.5.
This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) 1224 Extracts from BS 5950: Part 1 BS 5950: Part 1: 2000: Section four Table 16. Bending strength p b (N/mm 2 ) for rolled sections l LT Steel grade and design strength p y (N/mm 2 ) S 275 S 355 S 460 235 245 255 265 275 315 325 335 345 355 400 410 430 440 460 25 235 245 255 265 275 315 325 335 345 355 400 410 430 440 460 30 235 245 255 265 275 315 325 335 345 355 395 403 421 429 446 35 235 245 255 265 273 307 316 324 332 341 378 386 402 410 426 40 229 238 246 254 262 294 302 309 317 325 359 367 382 389 404 45 219 227 235 242 250 280 287 294 302 309 340 347 361 367 381 50 210 217 224 231 238 265 272 279 285 292 320 326 338 344 356 55 199 206 213 219 226 251 257 263 268 274 299 305 315 320 330 60 189 195 201 207 213 236 241 246 251 257 278 283 292 296 304 65 179 185 190 196 201 221 225 230 234 239 257 261 269 272 279 70 169 174 179 184 188 206 210 214 218 222 237 241 247 250 256 75 159 164 168 172 176 192 195 199 202 205 219 221 226 229 234 80 150 154 158 161 165 178 181 184 187 190 201 203 208 210 214 85 140 144 147 151 154 165 168 170 173 175 185 187 190 192 195 90 132 135 138 141 144 153 156 158 160 162 170 172 175 176 179 95 124 126 129 131 134 143 144 146 148 150 157 158 161 162 164 100 116 118 121 123 125 132 134 136 137 139 145 146 148 149 151 105 109 111 113 115 117 123 125 126 128 129 134 135 137 138 140 110 102 104 106 107 109 115 116 117 119 120 124 125 127 128 129 115 96 97 99 101 102 107 108 109 110 111 115 116 118 118 120 120 90 91 93 94 96 100 101 102 103 104 107 108 109 110 111 125 85 86 87 89 90 94 95 96 96 97 100 101 102 103 104 130 80 81 82 83 84 88 89 90 90 91 94 94 95 96 97 135 75 76 77 78 79 83 83 84 85 85 88 88 89 90 90 140 71 72 73 74 75 78 78 79 80 80 82 83 84 84 85 145 67 68 69 70 71 73 74 74 75 75 77 78 79 79 80 150 64 64 65 66 67 69 70 70 71 71 73 73 74 74 75 155 60 61 62 62 63 65 66 66 67 67 69 69 70 70 71 160 57 58 59 59 60 62 62 63 63 63 65 65 66 66 67 165 54 55 56 56 57 59 59 59 60 60 61 62 62 62 63 170 52 52 53 53 54 56 56 56 57 57 58 58 59 59 60 175 49 50 50 51 51 53 53 53 54 54 55 55 56 56 56 180 47 47 48 48 49 50 51 51 51 51 52 53 53 53 54 185 45 45 46 46 46 48 48 48 49 49 50 50 50 51 51 190 43 43 44 44 44 46 46 46 46 47 48 48 48 48 48 195 41 41 42 42 42 43 44 44 44 44 45 45 46 46 46 200 39 39 40 40 40 42 42 42 42 42 43 43 44 44 44 210 36 36 37 37 37 38 38 38 39 39 39 40 40 40 40 220 33 33 34 34 34 35 35 35 35 36 36 36 37 37 37 230 31 31 31 31 31 32 32 33 33 33 33 33 34 34 34 240 28 29 29 29 29 30 30 30 30 30 31 31 31 31 31 250 26 27 27 27 27 28 28 28 28 28 29 29 29 29 29 lL0 37.1 36.3 35.6 35.0 34.3 32.1 31.6 31.1 30.6 30.2 28.4 28.1 27.4 27.1 26.5
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