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Wide Flange Steel I Beam: W8 × 15
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two Equal Spans » Wide Flange Steel I Beam » W8 × 15
Wide Flange Steel 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 = 48.0 in4) for the W8 × 15 Wide Flange Steel I Beam and the typical Young's modulus (E = 3.046 × 107 psi) of steels. Note that the typical yielding stress Yield of steels can range from 1.015 × 104 to 2.970 × 105 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
  
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 7.48 × 10-6 17.1
20.0 9.97 × 10-6 22.8
30.0 1.50 × 10-5 34.2
40.0 1.99 × 10-5 45.6
50.0 2.49 × 10-5 57.0
60.0 2.99 × 10-5 68.4
70.0 3.49 × 10-5 79.8
80.0 3.99 × 10-5 91.2
90.0 4.49 × 10-5 103
100 4.99 × 10-5 114
200 9.97 × 10-5 228
300 1.50 × 10-4 342
400 1.99 × 10-4 456
500 2.49 × 10-4 570
600 2.99 × 10-4 684
700 3.49 × 10-4 798
800 3.99 × 10-4 912
900 4.49 × 10-4 1030
1000 4.99 × 10-4 1140
2000 9.97 × 10-4 2280
3000 0.00150 3420
4000 0.00199 4560
5000 0.00249 5700
6000 0.00299 6840
7000 0.00349 7980
8000 0.00399 9120
9000 0.00449 1.03 × 104
1.00 × 104 0.00499 1.14 × 104
2.00 × 104 0.00997 2.28 × 104
3.00 × 104 0.0150 3.42 × 104
4.00 × 104 0.0199 4.56 × 104
5.00 × 104 0.0249 5.70 × 104
6.00 × 104 0.0299 6.84 × 104
7.00 × 104 0.0349 7.98 × 104
8.00 × 104 0.0399 9.12 × 104
9.00 × 104 0.0449 1.03 × 105
1.00 × 105 0.0499 1.14 × 105
2.00 × 105 0.0997 2.28 × 105
2.60 × 105 0.130 2.97 × 105
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 5.77 × 10-5 47.5
20.0 7.70 × 10-5 63.4
30.0 1.15 × 10-4 95.0
40.0 1.54 × 10-4 127
50.0 1.92 × 10-4 158
60.0 2.31 × 10-4 190
70.0 2.69 × 10-4 222
80.0 3.08 × 10-4 253
90.0 3.46 × 10-4 285
100 3.85 × 10-4 317
200 7.70 × 10-4 634
300 0.00115 950
400 0.00154 1270
500 0.00192 1580
600 0.00231 1900
700 0.00269 2220
800 0.00308 2530
900 0.00346 2850
1000 0.00385 3170
2000 0.00770 6340
3000 0.0115 9500
4000 0.0154 1.27 × 104
5000 0.0192 1.58 × 104
6000 0.0231 1.90 × 104
7000 0.0269 2.22 × 104
8000 0.0308 2.53 × 104
9000 0.0346 2.85 × 104
1.00 × 104 0.0385 3.17 × 104
2.00 × 104 0.0770 6.34 × 104
3.00 × 104 0.115 9.50 × 104
4.00 × 104 0.154 1.27 × 105
5.00 × 104 0.192 1.58 × 105
6.00 × 104 0.231 1.90 × 105
7.00 × 104 0.269 2.22 × 105
8.00 × 104 0.308 2.53 × 105
9.00 × 104 0.346 2.85 × 105
9.38 × 104 0.361 2.97 × 105
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 9.23 × 10-4 190
20.0 0.00123 253
30.0 0.00185 380
40.0 0.00246 507
50.0 0.00308 634
60.0 0.00369 760
70.0 0.00431 887
80.0 0.00492 1010
90.0 0.00554 1140
100 0.00616 1270
200 0.0123 2530
300 0.0185 3800
400 0.0246 5070
500 0.0308 6340
600 0.0369 7600
700 0.0431 8870
800 0.0492 1.01 × 104
900 0.0554 1.14 × 104
1000 0.0616 1.27 × 104
2000 0.123 2.53 × 104
3000 0.185 3.80 × 104
4000 0.246 5.07 × 104
5000 0.308 6.34 × 104
6000 0.369 7.60 × 104
7000 0.431 8.87 × 104
8000 0.492 1.01 × 105
9000 0.554 1.14 × 105
1.00 × 104 0.616 1.27 × 105
2.00 × 104 1.23 2.53 × 105
2.34 × 104 1.44 2.97 × 105
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 0.00467 428
20.0 0.00623 570
30.0 0.00935 855
40.0 0.0125 1140
50.0 0.0156 1430
60.0 0.0187 1710
70.0 0.0218 2000
80.0 0.0249 2280
90.0 0.0280 2570
100 0.0312 2850
200 0.0623 5700
300 0.0935 8550
400 0.125 1.14 × 104
500 0.156 1.43 × 104
600 0.187 1.71 × 104
700 0.218 2.00 × 104
800 0.249 2.28 × 104
900 0.280 2.57 × 104
1000 0.312 2.85 × 104
2000 0.623 5.70 × 104
3000 0.935 8.55 × 104
4000 1.25 1.14 × 105
5000 1.56 1.43 × 105
6000 1.87 1.71 × 105
7000 2.18 2.00 × 105
8000 2.49 2.28 × 105
9000 2.80 2.57 × 105
1.00 × 104 3.12 2.85 × 105
1.04 × 104 3.25 2.97 × 105
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 0.0148 760
20.0 0.0197 1010
30.0 0.0295 1520
40.0 0.0394 2030
50.0 0.0492 2530
60.0 0.0591 3040
70.0 0.0689 3550
80.0 0.0788 4060
90.0 0.0886 4560
100 0.0985 5070
200 0.197 1.01 × 104
300 0.295 1.52 × 104
400 0.394 2.03 × 104
500 0.492 2.53 × 104
600 0.591 3.04 × 104
700 0.689 3.55 × 104
800 0.788 4.06 × 104
900 0.886 4.56 × 104
1000 0.985 5.07 × 104
2000 1.97 1.01 × 105
3000 2.95 1.52 × 105
4000 3.94 2.03 × 105
5000 4.92 2.53 × 105
5860 5.77 2.97 × 105
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 0.0361 1190
20.0 0.0481 1580
30.0 0.0721 2380
40.0 0.0962 3170
50.0 0.120 3960
60.0 0.144 4750
70.0 0.168 5540
80.0 0.192 6340
90.0 0.216 7130
100 0.240 7920
200 0.481 1.58 × 104
300 0.721 2.38 × 104
400 0.962 3.17 × 104
500 1.20 3.96 × 104
600 1.44 4.75 × 104
700 1.68 5.54 × 104
800 1.92 6.34 × 104
900 2.16 7.13 × 104
1000 2.40 7.92 × 104
2000 4.81 1.58 × 105
3000 7.21 2.38 × 105
3750 9.02 2.97 × 105
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 0.0748 1710
20.0 0.0997 2280
30.0 0.150 3420
40.0 0.199 4560
50.0 0.249 5700
60.0 0.299 6840
70.0 0.349 7980
80.0 0.399 9120
90.0 0.449 1.03 × 104
100 0.499 1.14 × 104
200 0.997 2.28 × 104
300 1.50 3.42 × 104
400 1.99 4.56 × 104
500 2.49 5.70 × 104
600 2.99 6.84 × 104
700 3.49 7.98 × 104
800 3.99 9.12 × 104
900 4.49 1.03 × 105
1000 4.99 1.14 × 105
1630 8.11 1.85 × 105
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 0.236 3040
20.0 0.315 4060
30.0 0.473 6080
40.0 0.630 8110
50.0 0.788 1.01 × 104
60.0 0.946 1.22 × 104
70.0 1.10 1.42 × 104
80.0 1.26 1.62 × 104
90.0 1.42 1.82 × 104
100 1.58 2.03 × 104
200 3.15 4.06 × 104
300 4.73 6.08 × 104
400 6.30 8.11 × 104
500 7.88 1.01 × 105
515 8.11 1.04 × 105
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 0.577 4750
20.0 0.770 6340
30.0 1.15 9500
40.0 1.54 1.27 × 104
50.0 1.92 1.58 × 104
60.0 2.31 1.90 × 104
70.0 2.69 2.22 × 104
80.0 3.08 2.53 × 104
90.0 3.46 2.85 × 104
100 3.85 3.17 × 104
200 7.70 6.34 × 104
211 8.11 6.68 × 104
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 1.20 6840
20.0 1.60 9120
30.0 2.39 1.37 × 104
40.0 3.19 1.82 × 104
50.0 3.99 2.28 × 104
60.0 4.79 2.74 × 104
70.0 5.58 3.19 × 104
80.0 6.38 3.65 × 104
90.0 7.18 4.11 × 104
100 7.98 4.56 × 104
102 8.11 4.64 × 104
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 2.22 9310
20.0 2.96 1.24 × 104
30.0 4.43 1.86 × 104
40.0 5.91 2.48 × 104
50.0 7.39 3.10 × 104
54.9 8.11 3.41 × 104
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 3.78 1.22 × 104
20.0 5.04 1.62 × 104
30.0 7.56 2.43 × 104
32.2 8.11 2.61 × 104
Steel I Beam: W8 × 15 (Wide Flange 8 inch tall × 15 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
15.0 6.06 1.54 × 104
20.0 8.08 2.05 × 104
20.1 8.11 2.06 × 104
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