Super stuck on this, can anyone help?

A strut of length 4 m is pin-jointed at both ends and is required to carry a compressive load of 2 MN. Select a suitable I-section with the lowest possible weight using standard section tables for Grade 43 steel.

Transcribed Image Text:

30 Slenderness ratio = l/k 20 Allowable stress for flange thickness up to 16 mm (Nmm-2) 272 262 Allowable stress for flange thickness 17-40mm (Nmm-2) 263 Allowable stress for flange thickness 41-100 mm (Nmm -2 243 253 234 40 250 241 224 50 237 229 213 55 228 221 206 60 221 214 200 65 211 205 192 70 202 196 185 75 192 187 176 80 181 177 85 171 167 168 159 90 161 157 95 150 148 150 141 100 141 138 105 131 129 110 123 121 133 125 118 115 115 113 110 120 108 107 104 125 101 100 130 95 94 135 89 88 97 92 86 140 84 83 81 145 79 78 77 150 74 74 72 155 70 70 69 160 66 66 65 165 170 175 180 185 190 195 200 250 300 350 386552 + 222 63 63 61 60 59 58 57 56 54 51 51 49 47 44 29 3*5*4*2 56 53 50 48 48 46 46 44 44 29 29 21 21 21 15 15 15 30 Slenderness ratio = l/k 20 Allowable stress for flange thickness up to 16 mm (Nmm-2) 272 262 Allowable stress for flange thickness 17-40mm (Nmm-2) 263 Allowable stress for flange thickness 41-100 mm (Nmm -2 243 253 234 40 250 241 224 50 237 229 213 55 228 221 206 60 221 214 200 65 211 205 192 70 202 196 185 75 192 187 176 80 181 177 85 171 167 168 159 90 161 157 95 150 148 150 141 100 141 138 105 131 129 110 123 121 133 125 118 115 115 113 110 120 108 107 104 125 101 100 130 95 94 135 89 88 97 92 86 140 84 83 81 145 79 78 77 150 74 74 72 155 70 70 69 160 66 66 65 165 170 175 180 185 190 195 200 250 300 350 386552 + 222 63 63 61 60 59 58 57 56 54 51 51 49 47 44 29 3*5*4*2 56 53 50 48 48 46 46 44 44 29 29 21 21 21 15 15 15