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Wide Flange Steel I Beam: W14 × 43
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Three Equal Spans » Wide Flange Steel I Beam » W14 × 43
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 = 428 in4) for the W14 × 43 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 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 3.14 × 10-6 7.41
50.0 3.65 × 10-6 8.62
60.0 4.38 × 10-6 10.3
70.0 5.11 × 10-6 12.1
80.0 5.84 × 10-6 13.8
90.0 6.57 × 10-6 15.5
100 7.30 × 10-6 17.2
200 1.46 × 10-5 34.5
300 2.19 × 10-5 51.7
400 2.92 × 10-5 68.9
500 3.65 × 10-5 86.2
600 4.38 × 10-5 103
700 5.11 × 10-5 121
800 5.84 × 10-5 138
900 6.57 × 10-5 155
1000 7.30 × 10-5 172
2000 1.46 × 10-4 345
3000 2.19 × 10-4 517
4000 2.92 × 10-4 689
5000 3.65 × 10-4 862
6000 4.38 × 10-4 1030
7000 5.11 × 10-4 1210
8000 5.84 × 10-4 1380
9000 6.57 × 10-4 1550
1.00 × 104 7.30 × 10-4 1720
2.00 × 104 0.00146 3450
3.00 × 104 0.00219 5170
4.00 × 104 0.00292 6890
5.00 × 104 0.00365 8620
6.00 × 104 0.00438 1.03 × 104
7.00 × 104 0.00511 1.21 × 104
8.00 × 104 0.00584 1.38 × 104
9.00 × 104 0.00657 1.55 × 104
1.00 × 105 0.00730 1.72 × 104
2.00 × 105 0.0146 3.45 × 104
3.00 × 105 0.0219 5.17 × 104
4.00 × 105 0.0292 6.89 × 104
5.00 × 105 0.0365 8.62 × 104
6.00 × 105 0.0438 1.03 × 105
7.00 × 105 0.0511 1.21 × 105
8.00 × 105 0.0584 1.38 × 105
9.00 × 105 0.0657 1.55 × 105
1.00 × 106 0.0730 1.72 × 105
1.72 × 106 0.126 2.97 × 105
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 2.42 × 10-5 20.6
50.0 2.82 × 10-5 23.9
60.0 3.38 × 10-5 28.7
70.0 3.94 × 10-5 33.5
80.0 4.51 × 10-5 38.3
90.0 5.07 × 10-5 43.1
100 5.63 × 10-5 47.9
200 1.13 × 10-4 95.7
300 1.69 × 10-4 144
400 2.25 × 10-4 191
500 2.82 × 10-4 239
600 3.38 × 10-4 287
700 3.94 × 10-4 335
800 4.51 × 10-4 383
900 5.07 × 10-4 431
1000 5.63 × 10-4 479
2000 0.00113 957
3000 0.00169 1440
4000 0.00225 1910
5000 0.00282 2390
6000 0.00338 2870
7000 0.00394 3350
8000 0.00451 3830
9000 0.00507 4310
1.00 × 104 0.00563 4790
2.00 × 104 0.0113 9570
3.00 × 104 0.0169 1.44 × 104
4.00 × 104 0.0225 1.91 × 104
5.00 × 104 0.0282 2.39 × 104
6.00 × 104 0.0338 2.87 × 104
7.00 × 104 0.0394 3.35 × 104
8.00 × 104 0.0451 3.83 × 104
9.00 × 104 0.0507 4.31 × 104
1.00 × 105 0.0563 4.79 × 104
2.00 × 105 0.113 9.57 × 104
3.00 × 105 0.169 1.44 × 105
4.00 × 105 0.225 1.91 × 105
5.00 × 105 0.282 2.39 × 105
6.00 × 105 0.338 2.87 × 105
6.20 × 105 0.350 2.97 × 105
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 3.88 × 10-4 82.3
50.0 4.51 × 10-4 95.7
60.0 5.41 × 10-4 115
70.0 6.31 × 10-4 134
80.0 7.21 × 10-4 153
90.0 8.11 × 10-4 172
100 9.01 × 10-4 191
200 0.00180 383
300 0.00270 574
400 0.00361 766
500 0.00451 957
600 0.00541 1150
700 0.00631 1340
800 0.00721 1530
900 0.00811 1720
1000 0.00901 1910
2000 0.0180 3830
3000 0.0270 5740
4000 0.0361 7660
5000 0.0451 9570
6000 0.0541 1.15 × 104
7000 0.0631 1.34 × 104
8000 0.0721 1.53 × 104
9000 0.0811 1.72 × 104
1.00 × 104 0.0901 1.91 × 104
2.00 × 104 0.180 3.83 × 104
3.00 × 104 0.270 5.74 × 104
4.00 × 104 0.361 7.66 × 104
5.00 × 104 0.451 9.57 × 104
6.00 × 104 0.541 1.15 × 105
7.00 × 104 0.631 1.34 × 105
8.00 × 104 0.721 1.53 × 105
9.00 × 104 0.811 1.72 × 105
1.00 × 105 0.901 1.91 × 105
1.55 × 105 1.40 2.97 × 105
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 0.00196 185
50.0 0.00228 215
60.0 0.00274 259
70.0 0.00319 302
80.0 0.00365 345
90.0 0.00411 388
100 0.00456 431
200 0.00913 862
300 0.0137 1290
400 0.0183 1720
500 0.0228 2150
600 0.0274 2590
700 0.0319 3020
800 0.0365 3450
900 0.0411 3880
1000 0.0456 4310
2000 0.0913 8620
3000 0.137 1.29 × 104
4000 0.183 1.72 × 104
5000 0.228 2.15 × 104
6000 0.274 2.59 × 104
7000 0.319 3.02 × 104
8000 0.365 3.45 × 104
9000 0.411 3.88 × 104
1.00 × 104 0.456 4.31 × 104
2.00 × 104 0.913 8.62 × 104
3.00 × 104 1.37 1.29 × 105
4.00 × 104 1.83 1.72 × 105
5.00 × 104 2.28 2.15 × 105
6.00 × 104 2.74 2.59 × 105
6.89 × 104 3.15 2.97 × 105
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 0.00620 329
50.0 0.00721 383
60.0 0.00865 460
70.0 0.0101 536
80.0 0.0115 613
90.0 0.0130 689
100 0.0144 766
200 0.0288 1530
300 0.0433 2300
400 0.0577 3060
500 0.0721 3830
600 0.0865 4600
700 0.101 5360
800 0.115 6130
900 0.130 6890
1000 0.144 7660
2000 0.288 1.53 × 104
3000 0.433 2.30 × 104
4000 0.577 3.06 × 104
5000 0.721 3.83 × 104
6000 0.865 4.60 × 104
7000 1.01 5.36 × 104
8000 1.15 6.13 × 104
9000 1.30 6.89 × 104
1.00 × 104 1.44 7.66 × 104
2.00 × 104 2.88 1.53 × 105
3.00 × 104 4.33 2.30 × 105
3.88 × 104 5.59 2.97 × 105
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 0.0151 515
50.0 0.0176 598
60.0 0.0211 718
70.0 0.0246 838
80.0 0.0282 957
90.0 0.0317 1080
100 0.0352 1200
200 0.0704 2390
300 0.106 3590
400 0.141 4790
500 0.176 5980
600 0.211 7180
700 0.246 8380
800 0.282 9570
900 0.317 1.08 × 104
1000 0.352 1.20 × 104
2000 0.704 2.39 × 104
3000 1.06 3.59 × 104
4000 1.41 4.79 × 104
5000 1.76 5.98 × 104
6000 2.11 7.18 × 104
7000 2.46 8.38 × 104
8000 2.82 9.57 × 104
9000 3.17 1.08 × 105
1.00 × 104 3.52 1.20 × 105
2.00 × 104 7.04 2.39 × 105
2.48 × 104 8.74 2.97 × 105
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 0.0314 741
50.0 0.0365 862
60.0 0.0438 1030
70.0 0.0511 1210
80.0 0.0584 1380
90.0 0.0657 1550
100 0.0730 1720
200 0.146 3450
300 0.219 5170
400 0.292 6890
500 0.365 8620
600 0.438 1.03 × 104
700 0.511 1.21 × 104
800 0.584 1.38 × 104
900 0.657 1.55 × 104
1000 0.730 1.72 × 104
2000 1.46 3.45 × 104
3000 2.19 5.17 × 104
4000 2.92 6.89 × 104
5000 3.65 8.62 × 104
6000 4.38 1.03 × 105
7000 5.11 1.21 × 105
8000 5.84 1.38 × 105
9000 6.57 1.55 × 105
1.00 × 104 7.30 1.72 × 105
1.72 × 104 12.6 2.97 × 105
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 0.0992 1320
50.0 0.115 1530
60.0 0.138 1840
70.0 0.162 2140
80.0 0.185 2450
90.0 0.208 2760
100 0.231 3060
200 0.462 6130
300 0.692 9190
400 0.923 1.23 × 104
500 1.15 1.53 × 104
600 1.38 1.84 × 104
700 1.62 2.14 × 104
800 1.85 2.45 × 104
900 2.08 2.76 × 104
1000 2.31 3.06 × 104
2000 4.62 6.13 × 104
3000 6.92 9.19 × 104
4000 9.23 1.23 × 105
5000 11.5 1.53 × 105
5920 13.7 1.81 × 105
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 0.242 2060
50.0 0.282 2390
60.0 0.338 2870
70.0 0.394 3350
80.0 0.451 3830
90.0 0.507 4310
100 0.563 4790
200 1.13 9570
300 1.69 1.44 × 104
400 2.25 1.91 × 104
500 2.82 2.39 × 104
600 3.38 2.87 × 104
700 3.94 3.35 × 104
800 4.51 3.83 × 104
900 5.07 4.31 × 104
1000 5.63 4.79 × 104
2000 11.3 9.57 × 104
2420 13.7 1.16 × 105
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 0.502 2960
50.0 0.584 3450
60.0 0.701 4140
70.0 0.818 4830
80.0 0.935 5520
90.0 1.05 6200
100 1.17 6890
200 2.34 1.38 × 104
300 3.50 2.07 × 104
400 4.67 2.76 × 104
500 5.84 3.45 × 104
600 7.01 4.14 × 104
700 8.18 4.83 × 104
800 9.35 5.52 × 104
900 10.5 6.20 × 104
1000 11.7 6.89 × 104
1170 13.7 8.06 × 104
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 0.931 4030
50.0 1.08 4690
60.0 1.30 5630
70.0 1.51 6570
80.0 1.73 7510
90.0 1.95 8440
100 2.16 9380
200 4.33 1.88 × 104
300 6.49 2.81 × 104
400 8.66 3.75 × 104
500 10.8 4.69 × 104
600 13.0 5.63 × 104
631 13.7 5.92 × 104
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 1.59 5270
50.0 1.85 6130
60.0 2.22 7350
70.0 2.58 8580
80.0 2.95 9800
90.0 3.32 1.10 × 104
100 3.69 1.23 × 104
200 7.38 2.45 × 104
300 11.1 3.68 × 104
370 13.7 4.53 × 104
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 2.54 6670
50.0 2.96 7760
60.0 3.55 9310
70.0 4.14 1.09 × 104
80.0 4.73 1.24 × 104
90.0 5.32 1.40 × 104
100 5.91 1.55 × 104
200 11.8 3.10 × 104
231 13.7 3.58 × 104
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 3.88 8230
50.0 4.51 9570
60.0 5.41 1.15 × 104
70.0 6.31 1.34 × 104
80.0 7.21 1.53 × 104
90.0 8.11 1.72 × 104
100 9.01 1.91 × 104
152 13.7 2.90 × 104
Steel I Beam: W14 × 43 (Wide Flange 14 inch tall × 43 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
43.0 9.46 1.29 × 104
50.0 11.0 1.50 × 104
60.0 13.2 1.80 × 104
62.1 13.7 1.86 × 104
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