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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 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 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.

 Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft) L = 3.00 ft (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (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 (lbf/ft) (in) (psi) 79.0 11.2 1.39 × 104 80.0 11.4 1.40 × 104 87.0 12.4 1.53 × 104