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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Three Equal Spans » Wide Flange Steel I Beam » W18 × 60
Wide Flange Steel I Beam | Single Span | Two Equal Spans | Three Equal Spans | Four Equal Spans

For a simply supported beam in three equal spans, we compute the displacement at the middle of the first and the third spans, and the maximum normal stress stress_max occuring at the second and third supports of the beam.
The tabulated data listed in this page are calculated based on the area moment of inertia (Ixx = 984 in4) for the W18 × 60 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
L = 100 ft
L = 125 ft
L = 150 ft
   
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 1.91 × 10-6 6.01
70.0 2.22 × 10-6 7.01
80.0 2.54 × 10-6 8.01
90.0 2.86 × 10-6 9.01
100 3.18 × 10-6 10.0
200 6.35 × 10-6 20.0
300 9.53 × 10-6 30.0
400 1.27 × 10-5 40.0
500 1.59 × 10-5 50.0
600 1.91 × 10-5 60.1
700 2.22 × 10-5 70.1
800 2.54 × 10-5 80.1
900 2.86 × 10-5 90.1
1000 3.18 × 10-5 100
2000 6.35 × 10-5 200
3000 9.53 × 10-5 300
4000 1.27 × 10-4 400
5000 1.59 × 10-4 500
6000 1.91 × 10-4 601
7000 2.22 × 10-4 701
8000 2.54 × 10-4 801
9000 2.86 × 10-4 901
1.00 × 104 3.18 × 10-4 1000
2.00 × 104 6.35 × 10-4 2000
3.00 × 104 9.53 × 10-4 3000
4.00 × 104 0.00127 4000
5.00 × 104 0.00159 5000
6.00 × 104 0.00191 6010
7.00 × 104 0.00222 7010
8.00 × 104 0.00254 8010
9.00 × 104 0.00286 9010
1.00 × 105 0.00318 1.00 × 104
2.00 × 105 0.00635 2.00 × 104
3.00 × 105 0.00953 3.00 × 104
4.00 × 105 0.0127 4.00 × 104
5.00 × 105 0.0159 5.00 × 104
6.00 × 105 0.0191 6.01 × 104
7.00 × 105 0.0222 7.01 × 104
8.00 × 105 0.0254 8.01 × 104
9.00 × 105 0.0286 9.01 × 104
1.00 × 106 0.0318 1.00 × 105
2.00 × 106 0.0635 2.00 × 105
2.97 × 106 0.0942 2.97 × 105
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 1.47 × 10-5 16.7
70.0 1.72 × 10-5 19.5
80.0 1.96 × 10-5 22.2
90.0 2.21 × 10-5 25.0
100 2.45 × 10-5 27.8
200 4.90 × 10-5 55.6
300 7.35 × 10-5 83.4
400 9.80 × 10-5 111
500 1.23 × 10-4 139
600 1.47 × 10-4 167
700 1.72 × 10-4 195
800 1.96 × 10-4 222
900 2.21 × 10-4 250
1000 2.45 × 10-4 278
2000 4.90 × 10-4 556
3000 7.35 × 10-4 834
4000 9.80 × 10-4 1110
5000 0.00123 1390
6000 0.00147 1670
7000 0.00172 1950
8000 0.00196 2220
9000 0.00221 2500
1.00 × 104 0.00245 2780
2.00 × 104 0.00490 5560
3.00 × 104 0.00735 8340
4.00 × 104 0.00980 1.11 × 104
5.00 × 104 0.0123 1.39 × 104
6.00 × 104 0.0147 1.67 × 104
7.00 × 104 0.0172 1.95 × 104
8.00 × 104 0.0196 2.22 × 104
9.00 × 104 0.0221 2.50 × 104
1.00 × 105 0.0245 2.78 × 104
2.00 × 105 0.0490 5.56 × 104
3.00 × 105 0.0735 8.34 × 104
4.00 × 105 0.0980 1.11 × 105
5.00 × 105 0.123 1.39 × 105
6.00 × 105 0.147 1.67 × 105
7.00 × 105 0.172 1.95 × 105
8.00 × 105 0.196 2.22 × 105
9.00 × 105 0.221 2.50 × 105
1.00 × 106 0.245 2.78 × 105
1.07 × 106 0.262 2.97 × 105
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 2.35 × 10-4 66.7
70.0 2.74 × 10-4 77.9
80.0 3.14 × 10-4 89.0
90.0 3.53 × 10-4 100
100 3.92 × 10-4 111
200 7.84 × 10-4 222
300 0.00118 334
400 0.00157 445
500 0.00196 556
600 0.00235 667
700 0.00274 779
800 0.00314 890
900 0.00353 1000
1000 0.00392 1110
2000 0.00784 2220
3000 0.0118 3340
4000 0.0157 4450
5000 0.0196 5560
6000 0.0235 6670
7000 0.0274 7790
8000 0.0314 8900
9000 0.0353 1.00 × 104
1.00 × 104 0.0392 1.11 × 104
2.00 × 104 0.0784 2.22 × 104
3.00 × 104 0.118 3.34 × 104
4.00 × 104 0.157 4.45 × 104
5.00 × 104 0.196 5.56 × 104
6.00 × 104 0.235 6.67 × 104
7.00 × 104 0.274 7.79 × 104
8.00 × 104 0.314 8.90 × 104
9.00 × 104 0.353 1.00 × 105
1.00 × 105 0.392 1.11 × 105
2.00 × 105 0.784 2.22 × 105
2.67 × 105 1.05 2.97 × 105
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 0.00119 150
70.0 0.00139 175
80.0 0.00159 200
90.0 0.00179 225
100 0.00198 250
200 0.00397 500
300 0.00595 751
400 0.00794 1000
500 0.00992 1250
600 0.0119 1500
700 0.0139 1750
800 0.0159 2000
900 0.0179 2250
1000 0.0198 2500
2000 0.0397 5000
3000 0.0595 7510
4000 0.0794 1.00 × 104
5000 0.0992 1.25 × 104
6000 0.119 1.50 × 104
7000 0.139 1.75 × 104
8000 0.159 2.00 × 104
9000 0.179 2.25 × 104
1.00 × 104 0.198 2.50 × 104
2.00 × 104 0.397 5.00 × 104
3.00 × 104 0.595 7.51 × 104
4.00 × 104 0.794 1.00 × 105
5.00 × 104 0.992 1.25 × 105
6.00 × 104 1.19 1.50 × 105
7.00 × 104 1.39 1.75 × 105
8.00 × 104 1.59 2.00 × 105
9.00 × 104 1.79 2.25 × 105
1.00 × 105 1.98 2.50 × 105
1.19 × 105 2.36 2.97 × 105
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 0.00376 267
70.0 0.00439 311
80.0 0.00502 356
90.0 0.00565 400
100 0.00627 445
200 0.0125 890
300 0.0188 1330
400 0.0251 1780
500 0.0314 2220
600 0.0376 2670
700 0.0439 3110
800 0.0502 3560
900 0.0565 4000
1000 0.0627 4450
2000 0.125 8900
3000 0.188 1.33 × 104
4000 0.251 1.78 × 104
5000 0.314 2.22 × 104
6000 0.376 2.67 × 104
7000 0.439 3.11 × 104
8000 0.502 3.56 × 104
9000 0.565 4.00 × 104
1.00 × 104 0.627 4.45 × 104
2.00 × 104 1.25 8.90 × 104
3.00 × 104 1.88 1.33 × 105
4.00 × 104 2.51 1.78 × 105
5.00 × 104 3.14 2.22 × 105
6.00 × 104 3.76 2.67 × 105
6.68 × 104 4.19 2.97 × 105
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 0.00919 417
70.0 0.0107 487
80.0 0.0123 556
90.0 0.0138 626
100 0.0153 695
200 0.0306 1390
300 0.0459 2090
400 0.0613 2780
500 0.0766 3480
600 0.0919 4170
700 0.107 4870
800 0.123 5560
900 0.138 6260
1000 0.153 6950
2000 0.306 1.39 × 104
3000 0.459 2.09 × 104
4000 0.613 2.78 × 104
5000 0.766 3.48 × 104
6000 0.919 4.17 × 104
7000 1.07 4.87 × 104
8000 1.23 5.56 × 104
9000 1.38 6.26 × 104
1.00 × 104 1.53 6.95 × 104
2.00 × 104 3.06 1.39 × 105
3.00 × 104 4.59 2.09 × 105
4.00 × 104 6.13 2.78 × 105
4.27 × 104 6.54 2.97 × 105
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 0.0191 601
70.0 0.0222 701
80.0 0.0254 801
90.0 0.0286 901
100 0.0318 1000
200 0.0635 2000
300 0.0953 3000
400 0.127 4000
500 0.159 5000
600 0.191 6010
700 0.222 7010
800 0.254 8010
900 0.286 9010
1000 0.318 1.00 × 104
2000 0.635 2.00 × 104
3000 0.953 3.00 × 104
4000 1.27 4.00 × 104
5000 1.59 5.00 × 104
6000 1.91 6.01 × 104
7000 2.22 7.01 × 104
8000 2.54 8.01 × 104
9000 2.86 9.01 × 104
1.00 × 104 3.18 1.00 × 105
2.00 × 104 6.35 2.00 × 105
2.97 × 104 9.42 2.97 × 105
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 0.0602 1070
70.0 0.0703 1250
80.0 0.0803 1420
90.0 0.0903 1600
100 0.100 1780
200 0.201 3560
300 0.301 5340
400 0.401 7120
500 0.502 8900
600 0.602 1.07 × 104
700 0.703 1.25 × 104
800 0.803 1.42 × 104
900 0.903 1.60 × 104
1000 1.00 1.78 × 104
2000 2.01 3.56 × 104
3000 3.01 5.34 × 104
4000 4.01 7.12 × 104
5000 5.02 8.90 × 104
6000 6.02 1.07 × 105
7000 7.03 1.25 × 105
8000 8.03 1.42 × 105
9000 9.03 1.60 × 105
1.00 × 104 10.0 1.78 × 105
1.67 × 104 16.8 2.97 × 105
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 0.147 1670
70.0 0.172 1950
80.0 0.196 2220
90.0 0.221 2500
100 0.245 2780
200 0.490 5560
300 0.735 8340
400 0.980 1.11 × 104
500 1.23 1.39 × 104
600 1.47 1.67 × 104
700 1.72 1.95 × 104
800 1.96 2.22 × 104
900 2.21 2.50 × 104
1000 2.45 2.78 × 104
2000 4.90 5.56 × 104
3000 7.35 8.34 × 104
4000 9.80 1.11 × 105
5000 12.3 1.39 × 105
6000 14.7 1.67 × 105
7000 17.2 1.95 × 105
7440 18.2 2.07 × 105
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 0.305 2400
70.0 0.356 2800
80.0 0.406 3200
90.0 0.457 3600
100 0.508 4000
200 1.02 8010
300 1.52 1.20 × 104
400 2.03 1.60 × 104
500 2.54 2.00 × 104
600 3.05 2.40 × 104
700 3.56 2.80 × 104
800 4.06 3.20 × 104
900 4.57 3.60 × 104
1000 5.08 4.00 × 104
2000 10.2 8.01 × 104
3000 15.2 1.20 × 105
3590 18.2 1.44 × 105
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 0.565 3270
70.0 0.659 3810
80.0 0.753 4360
90.0 0.847 4900
100 0.941 5450
200 1.88 1.09 × 104
300 2.82 1.63 × 104
400 3.77 2.18 × 104
500 4.71 2.72 × 104
600 5.65 3.27 × 104
700 6.59 3.81 × 104
800 7.53 4.36 × 104
900 8.47 4.90 × 104
1000 9.41 5.45 × 104
1940 18.2 1.06 × 105
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 0.964 4270
70.0 1.12 4980
80.0 1.28 5690
90.0 1.45 6410
100 1.61 7120
200 3.21 1.42 × 104
300 4.82 2.14 × 104
400 6.42 2.85 × 104
500 8.03 3.56 × 104
600 9.64 4.27 × 104
700 11.2 4.98 × 104
800 12.8 5.69 × 104
900 14.5 6.41 × 104
1000 16.1 7.12 × 104
1140 18.2 8.08 × 104
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 1.54 5410
70.0 1.80 6310
80.0 2.06 7210
90.0 2.32 8110
100 2.57 9010
200 5.14 1.80 × 104
300 7.72 2.70 × 104
400 10.3 3.60 × 104
500 12.9 4.50 × 104
600 15.4 5.41 × 104
700 18.0 6.31 × 104
709 18.2 6.39 × 104
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 2.35 6670
70.0 2.74 7790
80.0 3.14 8900
90.0 3.53 1.00 × 104
100 3.92 1.11 × 104
200 7.84 2.22 × 104
300 11.8 3.34 × 104
400 15.7 4.45 × 104
465 18.2 5.17 × 104
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 5.74 1.04 × 104
70.0 6.70 1.22 × 104
80.0 7.66 1.39 × 104
90.0 8.61 1.56 × 104
100 9.57 1.74 × 104
191 18.2 3.31 × 104
Steel I Beam: W18 × 60 (Wide Flange 18 inch tall × 60 lbf/ft)
L = 150 ft
P (lbf/ft) w_max (in) stress_max (psi)
60.0 11.9 1.50 × 104
70.0 13.9 1.75 × 104
80.0 15.9 2.00 × 104
90.0 17.9 2.25 × 104
91.9 18.2 2.30 × 104
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