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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Three Equal Spans » Wide Flange Steel I Beam » W14 × 145
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 = 1710 in4) for the W14 × 145 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
   
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 2.65 × 10-6 6.77
200 3.65 × 10-6 9.33
300 5.48 × 10-6 14.0
400 7.31 × 10-6 18.7
500 9.14 × 10-6 23.3
600 1.10 × 10-5 28.0
700 1.28 × 10-5 32.7
800 1.46 × 10-5 37.3
900 1.64 × 10-5 42.0
1000 1.83 × 10-5 46.7
2000 3.65 × 10-5 93.3
3000 5.48 × 10-5 140
4000 7.31 × 10-5 187
5000 9.14 × 10-5 233
6000 1.10 × 10-4 280
7000 1.28 × 10-4 327
8000 1.46 × 10-4 373
9000 1.64 × 10-4 420
1.00 × 104 1.83 × 10-4 467
2.00 × 104 3.65 × 10-4 933
3.00 × 104 5.48 × 10-4 1400
4.00 × 104 7.31 × 10-4 1870
5.00 × 104 9.14 × 10-4 2330
6.00 × 104 0.00110 2800
7.00 × 104 0.00128 3270
8.00 × 104 0.00146 3730
9.00 × 104 0.00164 4200
1.00 × 105 0.00183 4670
2.00 × 105 0.00365 9330
3.00 × 105 0.00548 1.40 × 104
4.00 × 105 0.00731 1.87 × 104
5.00 × 105 0.00914 2.33 × 104
6.00 × 105 0.0110 2.80 × 104
7.00 × 105 0.0128 3.27 × 104
8.00 × 105 0.0146 3.73 × 104
9.00 × 105 0.0164 4.20 × 104
1.00 × 106 0.0183 4.67 × 104
2.00 × 106 0.0365 9.33 × 104
3.00 × 106 0.0548 1.40 × 105
4.00 × 106 0.0731 1.87 × 105
5.00 × 106 0.0914 2.33 × 105
6.00 × 106 0.110 2.80 × 105
6.36 × 106 0.116 2.97 × 105
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 2.04 × 10-5 18.8
200 2.82 × 10-5 25.9
300 4.23 × 10-5 38.9
400 5.64 × 10-5 51.9
500 7.05 × 10-5 64.8
600 8.46 × 10-5 77.8
700 9.87 × 10-5 90.8
800 1.13 × 10-4 104
900 1.27 × 10-4 117
1000 1.41 × 10-4 130
2000 2.82 × 10-4 259
3000 4.23 × 10-4 389
4000 5.64 × 10-4 519
5000 7.05 × 10-4 648
6000 8.46 × 10-4 778
7000 9.87 × 10-4 908
8000 0.00113 1040
9000 0.00127 1170
1.00 × 104 0.00141 1300
2.00 × 104 0.00282 2590
3.00 × 104 0.00423 3890
4.00 × 104 0.00564 5190
5.00 × 104 0.00705 6480
6.00 × 104 0.00846 7780
7.00 × 104 0.00987 9080
8.00 × 104 0.0113 1.04 × 104
9.00 × 104 0.0127 1.17 × 104
1.00 × 105 0.0141 1.30 × 104
2.00 × 105 0.0282 2.59 × 104
3.00 × 105 0.0423 3.89 × 104
4.00 × 105 0.0564 5.19 × 104
5.00 × 105 0.0705 6.48 × 104
6.00 × 105 0.0846 7.78 × 104
7.00 × 105 0.0987 9.08 × 104
8.00 × 105 0.113 1.04 × 105
9.00 × 105 0.127 1.17 × 105
1.00 × 106 0.141 1.30 × 105
2.00 × 106 0.282 2.59 × 105
2.29 × 106 0.323 2.97 × 105
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 3.27 × 10-4 75.2
200 4.51 × 10-4 104
300 6.77 × 10-4 156
400 9.02 × 10-4 207
500 0.00113 259
600 0.00135 311
700 0.00158 363
800 0.00180 415
900 0.00203 467
1000 0.00226 519
2000 0.00451 1040
3000 0.00677 1560
4000 0.00902 2070
5000 0.0113 2590
6000 0.0135 3110
7000 0.0158 3630
8000 0.0180 4150
9000 0.0203 4670
1.00 × 104 0.0226 5190
2.00 × 104 0.0451 1.04 × 104
3.00 × 104 0.0677 1.56 × 104
4.00 × 104 0.0902 2.07 × 104
5.00 × 104 0.113 2.59 × 104
6.00 × 104 0.135 3.11 × 104
7.00 × 104 0.158 3.63 × 104
8.00 × 104 0.180 4.15 × 104
9.00 × 104 0.203 4.67 × 104
1.00 × 105 0.226 5.19 × 104
2.00 × 105 0.451 1.04 × 105
3.00 × 105 0.677 1.56 × 105
4.00 × 105 0.902 2.07 × 105
5.00 × 105 1.13 2.59 × 105
5.73 × 105 1.29 2.97 × 105
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 0.00166 169
200 0.00228 233
300 0.00343 350
400 0.00457 467
500 0.00571 583
600 0.00685 700
700 0.00800 817
800 0.00914 933
900 0.0103 1050
1000 0.0114 1170
2000 0.0228 2330
3000 0.0343 3500
4000 0.0457 4670
5000 0.0571 5830
6000 0.0685 7000
7000 0.0800 8170
8000 0.0914 9330
9000 0.103 1.05 × 104
1.00 × 104 0.114 1.17 × 104
2.00 × 104 0.228 2.33 × 104
3.00 × 104 0.343 3.50 × 104
4.00 × 104 0.457 4.67 × 104
5.00 × 104 0.571 5.83 × 104
6.00 × 104 0.685 7.00 × 104
7.00 × 104 0.800 8.17 × 104
8.00 × 104 0.914 9.33 × 104
9.00 × 104 1.03 1.05 × 105
1.00 × 105 1.14 1.17 × 105
2.00 × 105 2.28 2.33 × 105
2.55 × 105 2.91 2.97 × 105
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 0.00523 301
200 0.00722 415
300 0.0108 622
400 0.0144 830
500 0.0180 1040
600 0.0217 1240
700 0.0253 1450
800 0.0289 1660
900 0.0325 1870
1000 0.0361 2070
2000 0.0722 4150
3000 0.108 6220
4000 0.144 8300
5000 0.180 1.04 × 104
6000 0.217 1.24 × 104
7000 0.253 1.45 × 104
8000 0.289 1.66 × 104
9000 0.325 1.87 × 104
1.00 × 104 0.361 2.07 × 104
2.00 × 104 0.722 4.15 × 104
3.00 × 104 1.08 6.22 × 104
4.00 × 104 1.44 8.30 × 104
5.00 × 104 1.80 1.04 × 105
6.00 × 104 2.17 1.24 × 105
7.00 × 104 2.53 1.45 × 105
8.00 × 104 2.89 1.66 × 105
9.00 × 104 3.25 1.87 × 105
1.00 × 105 3.61 2.07 × 105
1.43 × 105 5.17 2.97 × 105
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 0.0128 470
200 0.0176 648
300 0.0264 972
400 0.0353 1300
500 0.0441 1620
600 0.0529 1940
700 0.0617 2270
800 0.0705 2590
900 0.0793 2920
1000 0.0881 3240
2000 0.176 6480
3000 0.264 9720
4000 0.353 1.30 × 104
5000 0.441 1.62 × 104
6000 0.529 1.94 × 104
7000 0.617 2.27 × 104
8000 0.705 2.59 × 104
9000 0.793 2.92 × 104
1.00 × 104 0.881 3.24 × 104
2.00 × 104 1.76 6.48 × 104
3.00 × 104 2.64 9.72 × 104
4.00 × 104 3.53 1.30 × 105
5.00 × 104 4.41 1.62 × 105
6.00 × 104 5.29 1.94 × 105
7.00 × 104 6.17 2.27 × 105
8.00 × 104 7.05 2.59 × 105
9.00 × 104 7.93 2.92 × 105
9.16 × 104 8.08 2.97 × 105
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 0.0265 677
200 0.0365 933
300 0.0548 1400
400 0.0731 1870
500 0.0914 2330
600 0.110 2800
700 0.128 3270
800 0.146 3730
900 0.164 4200
1000 0.183 4670
2000 0.365 9330
3000 0.548 1.40 × 104
4000 0.731 1.87 × 104
5000 0.914 2.33 × 104
6000 1.10 2.80 × 104
7000 1.28 3.27 × 104
8000 1.46 3.73 × 104
9000 1.64 4.20 × 104
1.00 × 104 1.83 4.67 × 104
2.00 × 104 3.65 9.33 × 104
3.00 × 104 5.48 1.40 × 105
4.00 × 104 7.31 1.87 × 105
5.00 × 104 9.14 2.33 × 105
6.00 × 104 11.0 2.80 × 105
6.36 × 104 11.6 2.97 × 105
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 0.0837 1200
200 0.116 1660
300 0.173 2490
400 0.231 3320
500 0.289 4150
600 0.347 4980
700 0.404 5810
800 0.462 6640
900 0.520 7470
1000 0.578 8300
2000 1.16 1.66 × 104
3000 1.73 2.49 × 104
4000 2.31 3.32 × 104
5000 2.89 4.15 × 104
6000 3.47 4.98 × 104
7000 4.04 5.81 × 104
8000 4.62 6.64 × 104
9000 5.20 7.47 × 104
1.00 × 104 5.78 8.30 × 104
2.00 × 104 11.6 1.66 × 105
2.56 × 104 14.8 2.12 × 105
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 0.204 1880
200 0.282 2590
300 0.423 3890
400 0.564 5190
500 0.705 6480
600 0.846 7780
700 0.987 9080
800 1.13 1.04 × 104
900 1.27 1.17 × 104
1000 1.41 1.30 × 104
2000 2.82 2.59 × 104
3000 4.23 3.89 × 104
4000 5.64 5.19 × 104
5000 7.05 6.48 × 104
6000 8.46 7.78 × 104
7000 9.87 9.08 × 104
8000 11.3 1.04 × 105
9000 12.7 1.17 × 105
1.00 × 104 14.1 1.30 × 105
1.05 × 104 14.8 1.36 × 105
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 0.424 2710
200 0.585 3730
300 0.877 5600
400 1.17 7470
500 1.46 9330
600 1.75 1.12 × 104
700 2.05 1.31 × 104
800 2.34 1.49 × 104
900 2.63 1.68 × 104
1000 2.92 1.87 × 104
2000 5.85 3.73 × 104
3000 8.77 5.60 × 104
4000 11.7 7.47 × 104
5000 14.6 9.33 × 104
5050 14.8 9.44 × 104
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 0.785 3680
200 1.08 5080
300 1.63 7620
400 2.17 1.02 × 104
500 2.71 1.27 × 104
600 3.25 1.52 × 104
700 3.79 1.78 × 104
800 4.33 2.03 × 104
900 4.88 2.29 × 104
1000 5.42 2.54 × 104
2000 10.8 5.08 × 104
2730 14.8 6.93 × 104
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 1.34 4810
200 1.85 6640
300 2.77 9960
400 3.70 1.33 × 104
500 4.62 1.66 × 104
600 5.54 1.99 × 104
700 6.47 2.32 × 104
800 7.39 2.66 × 104
900 8.32 2.99 × 104
1000 9.24 3.32 × 104
1600 14.8 5.31 × 104
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 2.15 6090
200 2.96 8400
300 4.44 1.26 × 104
400 5.92 1.68 × 104
500 7.40 2.10 × 104
600 8.88 2.52 × 104
700 10.4 2.94 × 104
800 11.8 3.36 × 104
900 13.3 3.78 × 104
999 14.8 4.19 × 104
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 3.27 7520
200 4.51 1.04 × 104
300 6.77 1.56 × 104
400 9.02 2.07 × 104
500 11.3 2.59 × 104
600 13.5 3.11 × 104
655 14.8 3.40 × 104
Steel I Beam: W14 × 145 (Wide Flange 14 inch tall × 145 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
145 7.99 1.17 × 104
200 11.0 1.62 × 104
268 14.8 2.17 × 104
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