engineering fundamentals
Wide Flange Steel I Beam: W8 × 28
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two Equal Spans » Wide Flange Steel I Beam » W8 × 28
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 = 98.0 in4) for the W8 × 28 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 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 6.84 × 10-6 15.5
30.0 7.33 × 10-6 16.7
40.0 9.77 × 10-6 22.2
50.0 1.22 × 10-5 27.8
60.0 1.47 × 10-5 33.3
70.0 1.71 × 10-5 38.9
80.0 1.95 × 10-5 44.4
90.0 2.20 × 10-5 50.0
100 2.44 × 10-5 55.5
200 4.88 × 10-5 111
300 7.33 × 10-5 167
400 9.77 × 10-5 222
500 1.22 × 10-4 278
600 1.47 × 10-4 333
700 1.71 × 10-4 389
800 1.95 × 10-4 444
900 2.20 × 10-4 500
1000 2.44 × 10-4 555
2000 4.88 × 10-4 1110
3000 7.33 × 10-4 1670
4000 9.77 × 10-4 2220
5000 0.00122 2780
6000 0.00147 3330
7000 0.00171 3890
8000 0.00195 4440
9000 0.00220 5000
1.00 × 104 0.00244 5550
2.00 × 104 0.00488 1.11 × 104
3.00 × 104 0.00733 1.67 × 104
4.00 × 104 0.00977 2.22 × 104
5.00 × 104 0.0122 2.78 × 104
6.00 × 104 0.0147 3.33 × 104
7.00 × 104 0.0171 3.89 × 104
8.00 × 104 0.0195 4.44 × 104
9.00 × 104 0.0220 5.00 × 104
1.00 × 105 0.0244 5.55 × 104
2.00 × 105 0.0488 1.11 × 105
3.00 × 105 0.0733 1.67 × 105
4.00 × 105 0.0977 2.22 × 105
5.00 × 105 0.122 2.78 × 105
5.35 × 105 0.131 2.97 × 105
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 5.28 × 10-5 43.2
30.0 5.65 × 10-5 46.3
40.0 7.54 × 10-5 61.7
50.0 9.42 × 10-5 77.1
60.0 1.13 × 10-4 92.5
70.0 1.32 × 10-4 108
80.0 1.51 × 10-4 123
90.0 1.70 × 10-4 139
100 1.88 × 10-4 154
200 3.77 × 10-4 308
300 5.65 × 10-4 463
400 7.54 × 10-4 617
500 9.42 × 10-4 771
600 0.00113 925
700 0.00132 1080
800 0.00151 1230
900 0.00170 1390
1000 0.00188 1540
2000 0.00377 3080
3000 0.00565 4630
4000 0.00754 6170
5000 0.00942 7710
6000 0.0113 9250
7000 0.0132 1.08 × 104
8000 0.0151 1.23 × 104
9000 0.0170 1.39 × 104
1.00 × 104 0.0188 1.54 × 104
2.00 × 104 0.0377 3.08 × 104
3.00 × 104 0.0565 4.63 × 104
4.00 × 104 0.0754 6.17 × 104
5.00 × 104 0.0942 7.71 × 104
6.00 × 104 0.113 9.25 × 104
7.00 × 104 0.132 1.08 × 105
8.00 × 104 0.151 1.23 × 105
9.00 × 104 0.170 1.39 × 105
1.00 × 105 0.188 1.54 × 105
1.93 × 105 0.363 2.97 × 105
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 8.44 × 10-4 173
30.0 9.05 × 10-4 185
40.0 0.00121 247
50.0 0.00151 308
60.0 0.00181 370
70.0 0.00211 432
80.0 0.00241 493
90.0 0.00271 555
100 0.00302 617
200 0.00603 1230
300 0.00905 1850
400 0.0121 2470
500 0.0151 3080
600 0.0181 3700
700 0.0211 4320
800 0.0241 4930
900 0.0271 5550
1000 0.0302 6170
2000 0.0603 1.23 × 104
3000 0.0905 1.85 × 104
4000 0.121 2.47 × 104
5000 0.151 3.08 × 104
6000 0.181 3.70 × 104
7000 0.211 4.32 × 104
8000 0.241 4.93 × 104
9000 0.271 5.55 × 104
1.00 × 104 0.302 6.17 × 104
2.00 × 104 0.603 1.23 × 105
3.00 × 104 0.905 1.85 × 105
4.00 × 104 1.21 2.47 × 105
4.82 × 104 1.45 2.97 × 105
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 0.00427 389
30.0 0.00458 416
40.0 0.00611 555
50.0 0.00763 694
60.0 0.00916 833
70.0 0.0107 972
80.0 0.0122 1110
90.0 0.0137 1250
100 0.0153 1390
200 0.0305 2780
300 0.0458 4160
400 0.0611 5550
500 0.0763 6940
600 0.0916 8330
700 0.107 9720
800 0.122 1.11 × 104
900 0.137 1.25 × 104
1000 0.153 1.39 × 104
2000 0.305 2.78 × 104
3000 0.458 4.16 × 104
4000 0.611 5.55 × 104
5000 0.763 6.94 × 104
6000 0.916 8.33 × 104
7000 1.07 9.72 × 104
8000 1.22 1.11 × 105
9000 1.37 1.25 × 105
1.00 × 104 1.53 1.39 × 105
2.00 × 104 3.05 2.78 × 105
2.14 × 104 3.27 2.97 × 105
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 0.0135 691
30.0 0.0145 740
40.0 0.0193 987
50.0 0.0241 1230
60.0 0.0289 1480
70.0 0.0338 1730
80.0 0.0386 1970
90.0 0.0434 2220
100 0.0482 2470
200 0.0965 4930
300 0.145 7400
400 0.193 9870
500 0.241 1.23 × 104
600 0.289 1.48 × 104
700 0.338 1.73 × 104
800 0.386 1.97 × 104
900 0.434 2.22 × 104
1000 0.482 2.47 × 104
2000 0.965 4.93 × 104
3000 1.45 7.40 × 104
4000 1.93 9.87 × 104
5000 2.41 1.23 × 105
6000 2.89 1.48 × 105
7000 3.38 1.73 × 105
8000 3.86 1.97 × 105
9000 4.34 2.22 × 105
1.00 × 104 4.82 2.47 × 105
1.20 × 104 5.81 2.97 × 105
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 0.0330 1080
30.0 0.0353 1160
40.0 0.0471 1540
50.0 0.0589 1930
60.0 0.0707 2310
70.0 0.0824 2700
80.0 0.0942 3080
90.0 0.106 3470
100 0.118 3860
200 0.236 7710
300 0.353 1.16 × 104
400 0.471 1.54 × 104
500 0.589 1.93 × 104
600 0.707 2.31 × 104
700 0.824 2.70 × 104
800 0.942 3.08 × 104
900 1.06 3.47 × 104
1000 1.18 3.86 × 104
2000 2.36 7.71 × 104
3000 3.53 1.16 × 105
4000 4.71 1.54 × 105
5000 5.89 1.93 × 105
6000 7.07 2.31 × 105
6840 8.06 2.64 × 105
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 0.0684 1550
30.0 0.0733 1670
40.0 0.0977 2220
50.0 0.122 2780
60.0 0.147 3330
70.0 0.171 3890
80.0 0.195 4440
90.0 0.220 5000
100 0.244 5550
200 0.488 1.11 × 104
300 0.733 1.67 × 104
400 0.977 2.22 × 104
500 1.22 2.78 × 104
600 1.47 3.33 × 104
700 1.71 3.89 × 104
800 1.95 4.44 × 104
900 2.20 5.00 × 104
1000 2.44 5.55 × 104
2000 4.88 1.11 × 105
3000 7.33 1.67 × 105
3300 8.06 1.83 × 105
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 0.216 2760
30.0 0.232 2960
40.0 0.309 3950
50.0 0.386 4930
60.0 0.463 5920
70.0 0.540 6910
80.0 0.618 7900
90.0 0.695 8880
100 0.772 9870
200 1.54 1.97 × 104
300 2.32 2.96 × 104
400 3.09 3.95 × 104
500 3.86 4.93 × 104
600 4.63 5.92 × 104
700 5.40 6.91 × 104
800 6.18 7.90 × 104
900 6.95 8.88 × 104
1000 7.72 9.87 × 104
1040 8.06 1.03 × 105
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 0.528 4320
30.0 0.565 4630
40.0 0.754 6170
50.0 0.942 7710
60.0 1.13 9250
70.0 1.32 1.08 × 104
80.0 1.51 1.23 × 104
90.0 1.70 1.39 × 104
100 1.88 1.54 × 104
200 3.77 3.08 × 104
300 5.65 4.63 × 104
400 7.54 6.17 × 104
428 8.06 6.60 × 104
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 1.09 6220
30.0 1.17 6660
40.0 1.56 8880
50.0 1.95 1.11 × 104
60.0 2.34 1.33 × 104
70.0 2.74 1.55 × 104
80.0 3.13 1.78 × 104
90.0 3.52 2.00 × 104
100 3.91 2.22 × 104
200 7.82 4.44 × 104
206 8.06 4.58 × 104
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 2.03 8460
30.0 2.17 9070
40.0 2.90 1.21 × 104
50.0 3.62 1.51 × 104
60.0 4.34 1.81 × 104
70.0 5.07 2.12 × 104
80.0 5.79 2.42 × 104
90.0 6.52 2.72 × 104
100 7.24 3.02 × 104
111 8.06 3.37 × 104
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 3.46 1.11 × 104
30.0 3.71 1.18 × 104
40.0 4.94 1.58 × 104
50.0 6.18 1.97 × 104
60.0 7.41 2.37 × 104
65.3 8.06 2.58 × 104
Steel I Beam: W8 × 28 (Wide Flange 8 inch tall × 28 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
28.0 5.54 1.40 × 104
30.0 5.93 1.50 × 104
40.0 7.91 2.00 × 104
40.7 8.06 2.04 × 104
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