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Wide Flange Steel I Beam: W12 × 79
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Three Equal Spans » Wide Flange Steel I Beam » W12 × 79
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 = 662 in4) for the W12 × 79 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: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 3.73 × 10-6 7.98
80.0 3.78 × 10-6 8.08
90.0 4.25 × 10-6 9.09
100 4.72 × 10-6 10.1
200 9.44 × 10-6 20.2
300 1.42 × 10-5 30.3
400 1.89 × 10-5 40.4
500 2.36 × 10-5 50.5
600 2.83 × 10-5 60.6
700 3.30 × 10-5 70.7
800 3.78 × 10-5 80.8
900 4.25 × 10-5 90.9
1000 4.72 × 10-5 101
2000 9.44 × 10-5 202
3000 1.42 × 10-4 303
4000 1.89 × 10-4 404
5000 2.36 × 10-4 505
6000 2.83 × 10-4 606
7000 3.30 × 10-4 707
8000 3.78 × 10-4 808
9000 4.25 × 10-4 909
1.00 × 104 4.72 × 10-4 1010
2.00 × 104 9.44 × 10-4 2020
3.00 × 104 0.00142 3030
4.00 × 104 0.00189 4040
5.00 × 104 0.00236 5050
6.00 × 104 0.00283 6060
7.00 × 104 0.00330 7070
8.00 × 104 0.00378 8080
9.00 × 104 0.00425 9090
1.00 × 105 0.00472 1.01 × 104
2.00 × 105 0.00944 2.02 × 104
3.00 × 105 0.0142 3.03 × 104
4.00 × 105 0.0189 4.04 × 104
5.00 × 105 0.0236 5.05 × 104
6.00 × 105 0.0283 6.06 × 104
7.00 × 105 0.0330 7.07 × 104
8.00 × 105 0.0378 8.08 × 104
9.00 × 105 0.0425 9.09 × 104
1.00 × 106 0.0472 1.01 × 105
2.00 × 106 0.0944 2.02 × 105
2.94 × 106 0.139 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 2.88 × 10-5 22.2
80.0 2.91 × 10-5 22.4
90.0 3.28 × 10-5 25.2
100 3.64 × 10-5 28.1
200 7.28 × 10-5 56.1
300 1.09 × 10-4 84.2
400 1.46 × 10-4 112
500 1.82 × 10-4 140
600 2.19 × 10-4 168
700 2.55 × 10-4 196
800 2.91 × 10-4 224
900 3.28 × 10-4 252
1000 3.64 × 10-4 281
2000 7.28 × 10-4 561
3000 0.00109 842
4000 0.00146 1120
5000 0.00182 1400
6000 0.00219 1680
7000 0.00255 1960
8000 0.00291 2240
9000 0.00328 2520
1.00 × 104 0.00364 2810
2.00 × 104 0.00728 5610
3.00 × 104 0.0109 8420
4.00 × 104 0.0146 1.12 × 104
5.00 × 104 0.0182 1.40 × 104
6.00 × 104 0.0219 1.68 × 104
7.00 × 104 0.0255 1.96 × 104
8.00 × 104 0.0291 2.24 × 104
9.00 × 104 0.0328 2.52 × 104
1.00 × 105 0.0364 2.81 × 104
2.00 × 105 0.0728 5.61 × 104
3.00 × 105 0.109 8.42 × 104
4.00 × 105 0.146 1.12 × 105
5.00 × 105 0.182 1.40 × 105
6.00 × 105 0.219 1.68 × 105
7.00 × 105 0.255 1.96 × 105
8.00 × 105 0.291 2.24 × 105
9.00 × 105 0.328 2.52 × 105
1.00 × 106 0.364 2.81 × 105
1.06 × 106 0.386 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 4.60 × 10-4 88.6
80.0 4.66 × 10-4 89.8
90.0 5.24 × 10-4 101
100 5.83 × 10-4 112
200 0.00117 224
300 0.00175 337
400 0.00233 449
500 0.00291 561
600 0.00350 673
700 0.00408 785
800 0.00466 898
900 0.00524 1010
1000 0.00583 1120
2000 0.0117 2240
3000 0.0175 3370
4000 0.0233 4490
5000 0.0291 5610
6000 0.0350 6730
7000 0.0408 7850
8000 0.0466 8980
9000 0.0524 1.01 × 104
1.00 × 104 0.0583 1.12 × 104
2.00 × 104 0.117 2.24 × 104
3.00 × 104 0.175 3.37 × 104
4.00 × 104 0.233 4.49 × 104
5.00 × 104 0.291 5.61 × 104
6.00 × 104 0.350 6.73 × 104
7.00 × 104 0.408 7.85 × 104
8.00 × 104 0.466 8.98 × 104
9.00 × 104 0.524 1.01 × 105
1.00 × 105 0.583 1.12 × 105
2.00 × 105 1.17 2.24 × 105
2.65 × 105 1.54 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.00233 199
80.0 0.00236 202
90.0 0.00266 227
100 0.00295 252
200 0.00590 505
300 0.00885 757
400 0.0118 1010
500 0.0148 1260
600 0.0177 1510
700 0.0207 1770
800 0.0236 2020
900 0.0266 2270
1000 0.0295 2520
2000 0.0590 5050
3000 0.0885 7570
4000 0.118 1.01 × 104
5000 0.148 1.26 × 104
6000 0.177 1.51 × 104
7000 0.207 1.77 × 104
8000 0.236 2.02 × 104
9000 0.266 2.27 × 104
1.00 × 104 0.295 2.52 × 104
2.00 × 104 0.590 5.05 × 104
3.00 × 104 0.885 7.57 × 104
4.00 × 104 1.18 1.01 × 105
5.00 × 104 1.48 1.26 × 105
6.00 × 104 1.77 1.51 × 105
7.00 × 104 2.07 1.77 × 105
8.00 × 104 2.36 2.02 × 105
9.00 × 104 2.66 2.27 × 105
1.00 × 105 2.95 2.52 × 105
1.18 × 105 3.47 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.00737 355
80.0 0.00746 359
90.0 0.00839 404
100 0.00932 449
200 0.0186 898
300 0.0280 1350
400 0.0373 1800
500 0.0466 2240
600 0.0559 2690
700 0.0653 3140
800 0.0746 3590
900 0.0839 4040
1000 0.0932 4490
2000 0.186 8980
3000 0.280 1.35 × 104
4000 0.373 1.80 × 104
5000 0.466 2.24 × 104
6000 0.559 2.69 × 104
7000 0.653 3.14 × 104
8000 0.746 3.59 × 104
9000 0.839 4.04 × 104
1.00 × 104 0.932 4.49 × 104
2.00 × 104 1.86 8.98 × 104
3.00 × 104 2.80 1.35 × 105
4.00 × 104 3.73 1.80 × 105
5.00 × 104 4.66 2.24 × 105
6.00 × 104 5.59 2.69 × 105
6.62 × 104 6.17 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.0180 554
80.0 0.0182 561
90.0 0.0205 631
100 0.0228 701
200 0.0455 1400
300 0.0683 2100
400 0.0911 2810
500 0.114 3510
600 0.137 4210
700 0.159 4910
800 0.182 5610
900 0.205 6310
1000 0.228 7010
2000 0.455 1.40 × 104
3000 0.683 2.10 × 104
4000 0.911 2.81 × 104
5000 1.14 3.51 × 104
6000 1.37 4.21 × 104
7000 1.59 4.91 × 104
8000 1.82 5.61 × 104
9000 2.05 6.31 × 104
1.00 × 104 2.28 7.01 × 104
2.00 × 104 4.55 1.40 × 105
3.00 × 104 6.83 2.10 × 105
4.00 × 104 9.11 2.81 × 105
4.24 × 104 9.64 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.0373 798
80.0 0.0378 808
90.0 0.0425 909
100 0.0472 1010
200 0.0944 2020
300 0.142 3030
400 0.189 4040
500 0.236 5050
600 0.283 6060
700 0.330 7070
800 0.378 8080
900 0.425 9090
1000 0.472 1.01 × 104
2000 0.944 2.02 × 104
3000 1.42 3.03 × 104
4000 1.89 4.04 × 104
5000 2.36 5.05 × 104
6000 2.83 6.06 × 104
7000 3.30 7.07 × 104
8000 3.78 8.08 × 104
9000 4.25 9.09 × 104
1.00 × 104 4.72 1.01 × 105
2.00 × 104 9.44 2.02 × 105
2.94 × 104 13.9 2.97 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.118 1420
80.0 0.119 1440
90.0 0.134 1620
100 0.149 1800
200 0.298 3590
300 0.448 5390
400 0.597 7180
500 0.746 8980
600 0.895 1.08 × 104
700 1.04 1.26 × 104
800 1.19 1.44 × 104
900 1.34 1.62 × 104
1000 1.49 1.80 × 104
2000 2.98 3.59 × 104
3000 4.48 5.39 × 104
4000 5.97 7.18 × 104
5000 7.46 8.98 × 104
6000 8.95 1.08 × 105
7000 10.4 1.26 × 105
8000 11.9 1.44 × 105
8300 12.4 1.49 × 105
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.288 2220
80.0 0.291 2240
90.0 0.328 2520
100 0.364 2810
200 0.728 5610
300 1.09 8420
400 1.46 1.12 × 104
500 1.82 1.40 × 104
600 2.19 1.68 × 104
700 2.55 1.96 × 104
800 2.91 2.24 × 104
900 3.28 2.52 × 104
1000 3.64 2.81 × 104
2000 7.28 5.61 × 104
3000 10.9 8.42 × 104
3400 12.4 9.53 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 0.597 3190
80.0 0.604 3230
90.0 0.680 3640
100 0.755 4040
200 1.51 8080
300 2.27 1.21 × 104
400 3.02 1.62 × 104
500 3.78 2.02 × 104
600 4.53 2.42 × 104
700 5.29 2.83 × 104
800 6.04 3.23 × 104
900 6.80 3.64 × 104
1000 7.55 4.04 × 104
1640 12.4 6.62 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 1.11 4340
80.0 1.12 4400
90.0 1.26 4950
100 1.40 5500
200 2.80 1.10 × 104
300 4.20 1.65 × 104
400 5.60 2.20 × 104
500 7.00 2.75 × 104
600 8.40 3.30 × 104
700 9.79 3.85 × 104
800 11.2 4.40 × 104
885 12.4 4.86 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 1.89 5670
80.0 1.91 5740
90.0 2.15 6460
100 2.39 7180
200 4.77 1.44 × 104
300 7.16 2.15 × 104
400 9.55 2.87 × 104
500 11.9 3.59 × 104
519 12.4 3.72 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 3.02 7180
80.0 3.06 7270
90.0 3.44 8180
100 3.82 9090
200 7.65 1.82 × 104
300 11.5 2.73 × 104
324 12.4 2.94 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 4.60 8860
80.0 4.66 8980
90.0 5.24 1.01 × 104
100 5.83 1.12 × 104
200 11.7 2.24 × 104
212 12.4 2.38 × 104
Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
79.0 11.2 1.39 × 104
80.0 11.4 1.40 × 104
87.0 12.4 1.53 × 104
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