DESIGN OF PURLIN
Spacing of Purlin = 1.15 m
Span of Purlin = 4.2 m
Section used = UPN120
No. of Sag rod = 1
Roof Angle = 5.71
Loads
Self weight = 13.3 Kg/m
Weight of Sheeting = 10 Kg/m2
Live Load = 100 Kg/m2
Wind Load = 115 Kg/m2
Bending Moment
Loads MAJOR AXIS MINOR AXIS UNIT
Dead Load 43.53 1.09 Kg-m
Live Load 201.85 5.05 Kg-m
Wind Load 232.13 --- Kg-m
Reaction
Loads VERTICAL HORIZONTAL UNIT
Dead Load 52.08 --- Kg.
Live Load 241.50 --- Kg.
Wind Load 276.35 27.64 Kg.
MAJOR AXIS MINOR AXIS UNIT
Moment- L.C.-1
(1.4DL+1.6LL) 383.91 9.60 Kg.m
Moment- L.C.-2
(1.2DL+1.2LL+1.2WL) 573.02 7.36 Kg.m
Critical Moment 573.02 9.60 Kg.m
Actual Bending Stress 94.40 8.65 N/mm2
Slenderness Ratio 77.11 112.26
D/T Ratio 13.33 7.86
Refer Table - 19(b) of BS 5950
Allowable Bending
Stress 228.28 227.15 N/mm2
Check for Deflection
dmax = 13.49 0.33 mm
Allowabe Deflection 14.00 7.00 mm
TABLE19B
5 10 15 20 25 30 35 40 45 50
30 275 275 275 275 275 275 275 275 275 275
35 275 275 275 275 275 275 275 275 275 275
40 275 275 275 275 274 273 272 272 272 272 TABLE1
45 275 275 269 266 264 263 263 262 262 262 5 2
50 275 269 261 257 255 253 253 252 252 251 10 3
55 275 263 254 248 246 244 243 242 241 241 15 4
60 275 258 246 240 236 234 233 232 231 230 20 5
65 275 252 239 232 227 224 223 221 221 220 25 6
70 274 247 232 223 218 215 213 211 210 209 30 7
75 271 242 225 215 209 206 203 201 200 199 35 8
80 268 237 219 208 201 195 193 191 190 189 40 9
85 265 233 213 200 193 188 184 182 180 179 45 10
90 262 228 207 193 185 179 175 173 171 169 50 11
95 260 224 201 186 177 171 167 164 162 160 TABLE2 h b sa t Jx
100 257 219 195 180 170 164 159 156 153 152 UPN100 100 50 6 8.5 205
105 254 215 190 174 163 156 151 148 146 144 UPN120 120 55 7 9 364
110 252 211 185 168 157 150 144 141 138 136 UPN140 140 60 7 10 605
115 250 207 180 162 151 143 138 134 131 129 UPN160 160 65 7.5 10.5 925
120 247 204 175 157 145 137 132 128 125 123 UPN180 180 70 8 11 1354
125 245 200 171 152 140 132 126 122 119 116 UPN200 200 75 8.5 11.5 1911
130 242 196 167 147 135 126 120 116 113 111 UPN220 220 80 9 12.5 2691
135 240 193 162 143 130 121 115 111 108 106 UPN240 240 85 9.5 13 3599
140 238 190 159 139 126 117 111 106 103 101 UPN260 260 90 10 14 4824
145 236 186 155 135 122 113 106 102 99 96 UPN280 280 95 10 15 6276
150 233 183 151 131 118 109 102 98 95 92 UPN300 300 100 10 16 8028
155 231 180 148 127 114 105 99 94 91 88
160 229 177 144 124 111 101 95 90 87 84
165 227 174 141 121 107 98 92 87 84 81 77 75 112 110
170 225 171 138 118 104 95 89 84 81 78
175 223 169 135 115 101 92 86 81 78 75 13 10 7.86 5
180 221 166 133 112 99 89 83 78 75 72 10 15 5 10
185 219 163 130 109 96 87 80 76 72 70 75 242 225 110 252 211
190 217 161 127 107 93 84 78 73 70 67 80 237 219 115 250 207
195 215 158 125 104 91 82 76 71 68 65 77.1058 240 222 112 251 209
200 213 156 122 102 89 80 74 69 65 63
210 209 151 118 98 85 76 70 65 62 59 228 227
220 206 147 114 94 81 72 66 62 58 55
230 202 143 110 90 78 69 63 58 55 52
240 199 139 106 87 74 66 60 56 52 50
250 195 135 103 84 72 63 57 53 50 47
Jy Px Py p Sx Sy
29.1 3.91 1.47 10.6 41.1 8.45
43.1 4.63 1.59 13.3 60.7 11.1
62.5 5.45 1.75 16 86.4 14.7
85.1 6.21 1.88 18.9 116 18.2
114 6.96 2.01 22 150 22.4
148 7.71 2.14 25.3 191 26.9
196 8.48 2.29 29.4 245 33.5
247 9.22 2.42 33.2 300 39.5
317 10 2.56 37.9 371 47.8
398 10.8 2.73 14.9 448 57.2
493 11.7 2.9 46.1 535 67.6
