engineering fundamentals
Aluminum I Beam: 12.00 × 11.672
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two Equal Spans » Aluminum I Beam » 12.00 × 11.672
Aluminum I Beam | Single Span | Two Equal Spans | Three Equal Spans | Four Equal Spans

For a simply supported beam in two equal spans, we compute the displacement at the middle of each span w_mid and the maximum normal stress stress_max occuring at the center support of the beam.
The tabulated data listed in this page are calculated based on the area moment of inertia (Ixx = 255.57 in4) for the 12.00 × 11.672 Aluminum I Beam and the typical Young's modulus (E = 1.015 × 107 psi) of aluminum alloys. Note that the typical yielding stress Yield of aluminum alloys can range from 4061 to 7.614 × 104 psi. The purpose of this page is to give a rough estimation of the load-bearing capacity of this particular beam, rather than a guideline for designing actual building structures. Please check your local building codes for regulatory requirements.

Note: The weight of the beam itself is not included in the calculation.
L = 3 ft
L = 5 ft
L = 10 ft
L = 15 ft
L = 20 ft
L = 25 ft
L = 30 ft
L = 40 ft
L = 50 ft
L = 60 ft
L = 70 ft
L = 80 ft
L = 90 ft
L = 100 ft
L = 125 ft
   
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 3.28 × 10-6 3.70
20.0 5.62 × 10-6 6.34
30.0 8.43 × 10-6 9.51
40.0 1.12 × 10-5 12.7
50.0 1.40 × 10-5 15.8
60.0 1.69 × 10-5 19.0
70.0 1.97 × 10-5 22.2
80.0 2.25 × 10-5 25.4
90.0 2.53 × 10-5 28.5
100 2.81 × 10-5 31.7
200 5.62 × 10-5 63.4
300 8.43 × 10-5 95.1
400 1.12 × 10-4 127
500 1.40 × 10-4 158
600 1.69 × 10-4 190
700 1.97 × 10-4 222
800 2.25 × 10-4 254
900 2.53 × 10-4 285
1000 2.81 × 10-4 317
2000 5.62 × 10-4 634
3000 8.43 × 10-4 951
4000 0.00112 1270
5000 0.00140 1580
6000 0.00169 1900
7000 0.00197 2220
8000 0.00225 2540
9000 0.00253 2850
1.00 × 104 0.00281 3170
2.00 × 104 0.00562 6340
3.00 × 104 0.00843 9510
4.00 × 104 0.0112 1.27 × 104
5.00 × 104 0.0140 1.58 × 104
6.00 × 104 0.0169 1.90 × 104
7.00 × 104 0.0197 2.22 × 104
8.00 × 104 0.0225 2.54 × 104
9.00 × 104 0.0253 2.85 × 104
1.00 × 105 0.0281 3.17 × 104
2.00 × 105 0.0562 6.34 × 104
2.40 × 105 0.0675 7.61 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 2.53 × 10-5 10.3
20.0 4.34 × 10-5 17.6
30.0 6.50 × 10-5 26.4
40.0 8.67 × 10-5 35.2
50.0 1.08 × 10-4 44.0
60.0 1.30 × 10-4 52.8
70.0 1.52 × 10-4 61.6
80.0 1.73 × 10-4 70.4
90.0 1.95 × 10-4 79.2
100 2.17 × 10-4 88.0
200 4.34 × 10-4 176
300 6.50 × 10-4 264
400 8.67 × 10-4 352
500 0.00108 440
600 0.00130 528
700 0.00152 616
800 0.00173 704
900 0.00195 792
1000 0.00217 880
2000 0.00434 1760
3000 0.00650 2640
4000 0.00867 3520
5000 0.0108 4400
6000 0.0130 5280
7000 0.0152 6160
8000 0.0173 7040
9000 0.0195 7920
1.00 × 104 0.0217 8800
2.00 × 104 0.0434 1.76 × 104
3.00 × 104 0.0650 2.64 × 104
4.00 × 104 0.0867 3.52 × 104
5.00 × 104 0.108 4.40 × 104
6.00 × 104 0.130 5.28 × 104
7.00 × 104 0.152 6.16 × 104
8.00 × 104 0.173 7.04 × 104
8.65 × 104 0.188 7.61 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 4.05 × 10-4 41.1
20.0 6.94 × 10-4 70.4
30.0 0.00104 106
40.0 0.00139 141
50.0 0.00173 176
60.0 0.00208 211
70.0 0.00243 247
80.0 0.00277 282
90.0 0.00312 317
100 0.00347 352
200 0.00694 704
300 0.0104 1060
400 0.0139 1410
500 0.0173 1760
600 0.0208 2110
700 0.0243 2470
800 0.0277 2820
900 0.0312 3170
1000 0.0347 3520
2000 0.0694 7040
3000 0.104 1.06 × 104
4000 0.139 1.41 × 104
5000 0.173 1.76 × 104
6000 0.208 2.11 × 104
7000 0.243 2.47 × 104
8000 0.277 2.82 × 104
9000 0.312 3.17 × 104
1.00 × 104 0.347 3.52 × 104
2.00 × 104 0.694 7.04 × 104
2.16 × 104 0.750 7.61 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 0.00205 92.5
20.0 0.00351 158
30.0 0.00527 238
40.0 0.00702 317
50.0 0.00878 396
60.0 0.0105 475
70.0 0.0123 555
80.0 0.0140 634
90.0 0.0158 713
100 0.0176 792
200 0.0351 1580
300 0.0527 2380
400 0.0702 3170
500 0.0878 3960
600 0.105 4750
700 0.123 5550
800 0.140 6340
900 0.158 7130
1000 0.176 7920
2000 0.351 1.58 × 104
3000 0.527 2.38 × 104
4000 0.702 3.17 × 104
5000 0.878 3.96 × 104
6000 1.05 4.75 × 104
7000 1.23 5.55 × 104
8000 1.40 6.34 × 104
9000 1.58 7.13 × 104
9610 1.69 7.61 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 0.00648 164
20.0 0.0111 282
30.0 0.0166 423
40.0 0.0222 563
50.0 0.0277 704
60.0 0.0333 845
70.0 0.0388 986
80.0 0.0444 1130
90.0 0.0499 1270
100 0.0555 1410
200 0.111 2820
300 0.166 4230
400 0.222 5630
500 0.277 7040
600 0.333 8450
700 0.388 9860
800 0.444 1.13 × 104
900 0.499 1.27 × 104
1000 0.555 1.41 × 104
2000 1.11 2.82 × 104
3000 1.66 4.23 × 104
4000 2.22 5.63 × 104
5000 2.77 7.04 × 104
5410 3.00 7.61 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 0.0158 257
20.0 0.0271 440
30.0 0.0406 660
40.0 0.0542 880
50.0 0.0677 1100
60.0 0.0813 1320
70.0 0.0948 1540
80.0 0.108 1760
90.0 0.122 1980
100 0.135 2200
200 0.271 4400
300 0.406 6600
400 0.542 8800
500 0.677 1.10 × 104
600 0.813 1.32 × 104
700 0.948 1.54 × 104
800 1.08 1.76 × 104
900 1.22 1.98 × 104
1000 1.35 2.20 × 104
2000 2.71 4.40 × 104
3000 4.06 6.60 × 104
3460 4.69 7.61 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 0.0328 370
20.0 0.0562 634
30.0 0.0843 951
40.0 0.112 1270
50.0 0.140 1580
60.0 0.169 1900
70.0 0.197 2220
80.0 0.225 2540
90.0 0.253 2850
100 0.281 3170
200 0.562 6340
300 0.843 9510
400 1.12 1.27 × 104
500 1.40 1.58 × 104
600 1.69 1.90 × 104
700 1.97 2.22 × 104
800 2.25 2.54 × 104
900 2.53 2.85 × 104
1000 2.81 3.17 × 104
2000 5.62 6.34 × 104
2400 6.75 7.61 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 0.104 658
20.0 0.178 1130
30.0 0.266 1690
40.0 0.355 2250
50.0 0.444 2820
60.0 0.533 3380
70.0 0.622 3940
80.0 0.710 4510
90.0 0.799 5070
100 0.888 5630
200 1.78 1.13 × 104
300 2.66 1.69 × 104
400 3.55 2.25 × 104
500 4.44 2.82 × 104
600 5.33 3.38 × 104
700 6.22 3.94 × 104
800 7.10 4.51 × 104
900 7.99 5.07 × 104
1000 8.88 5.63 × 104
1350 12.0 7.61 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 0.253 1030
20.0 0.434 1760
30.0 0.650 2640
40.0 0.867 3520
50.0 1.08 4400
60.0 1.30 5280
70.0 1.52 6160
80.0 1.73 7040
90.0 1.95 7920
100 2.17 8800
200 4.34 1.76 × 104
300 6.50 2.64 × 104
400 8.67 3.52 × 104
500 10.8 4.40 × 104
554 12.0 4.87 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 0.525 1480
20.0 0.899 2540
30.0 1.35 3800
40.0 1.80 5070
50.0 2.25 6340
60.0 2.70 7610
70.0 3.15 8870
80.0 3.60 1.01 × 104
90.0 4.05 1.14 × 104
100 4.50 1.27 × 104
200 8.99 2.54 × 104
267 12.0 3.38 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 0.972 2010
20.0 1.67 3450
30.0 2.50 5180
40.0 3.33 6900
50.0 4.16 8630
60.0 5.00 1.04 × 104
70.0 5.83 1.21 × 104
80.0 6.66 1.38 × 104
90.0 7.50 1.55 × 104
100 8.33 1.73 × 104
144 12.0 2.49 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 1.66 2630
20.0 2.84 4510
30.0 4.26 6760
40.0 5.68 9020
50.0 7.10 1.13 × 104
60.0 8.52 1.35 × 104
70.0 9.95 1.58 × 104
80.0 11.4 1.80 × 104
84.5 12.0 1.90 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 2.66 3330
20.0 4.55 5700
30.0 6.83 8560
40.0 9.10 1.14 × 104
50.0 11.4 1.43 × 104
52.7 12.0 1.50 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 100 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 4.05 4110
20.0 6.94 7040
30.0 10.4 1.06 × 104
34.6 12.0 1.22 × 104
Aluminum I Beam: 12.00 × 11.672 (12.00 inch tall × 11.672 lbf/ft)
L = 125 ft
P (lbf/ft) w_mid (in) stress_max (psi)
11.7 9.88 6420
14.2 12.0 7800
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