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Wide Flange Steel I Beam: W8 × 15
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Four 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 four equal spans, we compute the displacement at the middle of the first and fourth spans, and the maximum normal stress stress_max occuring at the second and fourth supports 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 9.05 × 10-6 14.7
20.0 1.21 × 10-5 19.5
30.0 1.81 × 10-5 29.3
40.0 2.41 × 10-5 39.1
50.0 3.02 × 10-5 48.9
60.0 3.62 × 10-5 58.6
70.0 4.22 × 10-5 68.4
80.0 4.83 × 10-5 78.2
90.0 5.43 × 10-5 87.9
100 6.03 × 10-5 97.7
200 1.21 × 10-4 195
300 1.81 × 10-4 293
400 2.41 × 10-4 391
500 3.02 × 10-4 489
600 3.62 × 10-4 586
700 4.22 × 10-4 684
800 4.83 × 10-4 782
900 5.43 × 10-4 879
1000 6.03 × 10-4 977
2000 0.00121 1950
3000 0.00181 2930
4000 0.00241 3910
5000 0.00302 4890
6000 0.00362 5860
7000 0.00422 6840
8000 0.00483 7820
9000 0.00543 8790
1.00 × 104 0.00603 9770
2.00 × 104 0.0121 1.95 × 104
3.00 × 104 0.0181 2.93 × 104
4.00 × 104 0.0241 3.91 × 104
5.00 × 104 0.0302 4.89 × 104
6.00 × 104 0.0362 5.86 × 104
7.00 × 104 0.0422 6.84 × 104
8.00 × 104 0.0483 7.82 × 104
9.00 × 104 0.0543 8.79 × 104
1.00 × 105 0.0603 9.77 × 104
2.00 × 105 0.121 1.95 × 105
3.00 × 105 0.181 2.93 × 105
3.04 × 105 0.183 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 6.98 × 10-5 40.7
20.0 9.31 × 10-5 54.3
30.0 1.40 × 10-4 81.4
40.0 1.86 × 10-4 109
50.0 2.33 × 10-4 136
60.0 2.79 × 10-4 163
70.0 3.26 × 10-4 190
80.0 3.72 × 10-4 217
90.0 4.19 × 10-4 244
100 4.65 × 10-4 271
200 9.31 × 10-4 543
300 0.00140 814
400 0.00186 1090
500 0.00233 1360
600 0.00279 1630
700 0.00326 1900
800 0.00372 2170
900 0.00419 2440
1000 0.00465 2710
2000 0.00931 5430
3000 0.0140 8140
4000 0.0186 1.09 × 104
5000 0.0233 1.36 × 104
6000 0.0279 1.63 × 104
7000 0.0326 1.90 × 104
8000 0.0372 2.17 × 104
9000 0.0419 2.44 × 104
1.00 × 104 0.0465 2.71 × 104
2.00 × 104 0.0931 5.43 × 104
3.00 × 104 0.140 8.14 × 104
4.00 × 104 0.186 1.09 × 105
5.00 × 104 0.233 1.36 × 105
6.00 × 104 0.279 1.63 × 105
7.00 × 104 0.326 1.90 × 105
8.00 × 104 0.372 2.17 × 105
9.00 × 104 0.419 2.44 × 105
1.00 × 105 0.465 2.71 × 105
1.09 × 105 0.509 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 0.00112 163
20.0 0.00149 217
30.0 0.00223 326
40.0 0.00298 434
50.0 0.00372 543
60.0 0.00447 651
70.0 0.00521 760
80.0 0.00596 869
90.0 0.00670 977
100 0.00745 1090
200 0.0149 2170
300 0.0223 3260
400 0.0298 4340
500 0.0372 5430
600 0.0447 6510
700 0.0521 7600
800 0.0596 8690
900 0.0670 9770
1000 0.0745 1.09 × 104
2000 0.149 2.17 × 104
3000 0.223 3.26 × 104
4000 0.298 4.34 × 104
5000 0.372 5.43 × 104
6000 0.447 6.51 × 104
7000 0.521 7.60 × 104
8000 0.596 8.69 × 104
9000 0.670 9.77 × 104
1.00 × 104 0.745 1.09 × 105
2.00 × 104 1.49 2.17 × 105
2.74 × 104 2.04 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 0.00565 366
20.0 0.00754 489
30.0 0.0113 733
40.0 0.0151 977
50.0 0.0188 1220
60.0 0.0226 1470
70.0 0.0264 1710
80.0 0.0302 1950
90.0 0.0339 2200
100 0.0377 2440
200 0.0754 4890
300 0.113 7330
400 0.151 9770
500 0.188 1.22 × 104
600 0.226 1.47 × 104
700 0.264 1.71 × 104
800 0.302 1.95 × 104
900 0.339 2.20 × 104
1000 0.377 2.44 × 104
2000 0.754 4.89 × 104
3000 1.13 7.33 × 104
4000 1.51 9.77 × 104
5000 1.88 1.22 × 105
6000 2.26 1.47 × 105
7000 2.64 1.71 × 105
8000 3.02 1.95 × 105
9000 3.39 2.20 × 105
1.00 × 104 3.77 2.44 × 105
1.22 × 104 4.58 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 0.0179 651
20.0 0.0238 869
30.0 0.0357 1300
40.0 0.0477 1740
50.0 0.0596 2170
60.0 0.0715 2610
70.0 0.0834 3040
80.0 0.0953 3470
90.0 0.107 3910
100 0.119 4340
200 0.238 8690
300 0.357 1.30 × 104
400 0.477 1.74 × 104
500 0.596 2.17 × 104
600 0.715 2.61 × 104
700 0.834 3.04 × 104
800 0.953 3.47 × 104
900 1.07 3.91 × 104
1000 1.19 4.34 × 104
2000 2.38 8.69 × 104
3000 3.57 1.30 × 105
4000 4.77 1.74 × 105
5000 5.96 2.17 × 105
6000 7.15 2.61 × 105
6840 8.15 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 0.0436 1020
20.0 0.0582 1360
30.0 0.0873 2040
40.0 0.116 2710
50.0 0.145 3390
60.0 0.175 4070
70.0 0.204 4750
80.0 0.233 5430
90.0 0.262 6110
100 0.291 6790
200 0.582 1.36 × 104
300 0.873 2.04 × 104
400 1.16 2.71 × 104
500 1.45 3.39 × 104
600 1.75 4.07 × 104
700 2.04 4.75 × 104
800 2.33 5.43 × 104
900 2.62 6.11 × 104
1000 2.91 6.79 × 104
2000 5.82 1.36 × 105
2790 8.11 1.89 × 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 0.0905 1470
20.0 0.121 1950
30.0 0.181 2930
40.0 0.241 3910
50.0 0.302 4890
60.0 0.362 5860
70.0 0.422 6840
80.0 0.483 7820
90.0 0.543 8790
100 0.603 9770
200 1.21 1.95 × 104
300 1.81 2.93 × 104
400 2.41 3.91 × 104
500 3.02 4.89 × 104
600 3.62 5.86 × 104
700 4.22 6.84 × 104
800 4.83 7.82 × 104
900 5.43 8.79 × 104
1000 6.03 9.77 × 104
1340 8.11 1.31 × 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 0.286 2610
20.0 0.381 3470
30.0 0.572 5210
40.0 0.763 6950
50.0 0.953 8690
60.0 1.14 1.04 × 104
70.0 1.33 1.22 × 104
80.0 1.53 1.39 × 104
90.0 1.72 1.56 × 104
100 1.91 1.74 × 104
200 3.81 3.47 × 104
300 5.72 5.21 × 104
400 7.63 6.95 × 104
425 8.11 7.39 × 104
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 0.698 4070
20.0 0.931 5430
30.0 1.40 8140
40.0 1.86 1.09 × 104
50.0 2.33 1.36 × 104
60.0 2.79 1.63 × 104
70.0 3.26 1.90 × 104
80.0 3.72 2.17 × 104
90.0 4.19 2.44 × 104
100 4.65 2.71 × 104
174 8.11 4.73 × 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 1.45 5860
20.0 1.93 7820
30.0 2.90 1.17 × 104
40.0 3.86 1.56 × 104
50.0 4.83 1.95 × 104
60.0 5.79 2.35 × 104
70.0 6.76 2.74 × 104
80.0 7.72 3.13 × 104
84.0 8.11 3.28 × 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 2.68 7980
20.0 3.58 1.06 × 104
30.0 5.36 1.60 × 104
40.0 7.15 2.13 × 104
45.4 8.11 2.41 × 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 4.58 1.04 × 104
20.0 6.10 1.39 × 104
26.6 8.11 1.85 × 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 7.33 1.32 × 104
16.6 8.11 1.46 × 104
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