Materials Design Center Processes Unit Conversion Formulas Mathematics
 Calculators Discussion Forum Trade Publications Directory Service
Machine Design

How-to, in-depth technical articles for machine design engineers

NASA Tech Briefs

Innovations developed by NASA and its industry partners in a wide array of fields.

CNC Machining Design Guide

Quality Magazine

Techniques to improve quality on the shop floor and in manufacturing planning.

more free magazines
Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » Wide Flange Steel I Beam » W12 × 79

For a simply supported beam in a single span, the maximum displacement and the maximum normal stress occur at the center 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 7.14 × 10-6 9.97 80.0 7.23 × 10-6 10.1 90.0 8.13 × 10-6 11.4 100 9.04 × 10-6 12.6 200 1.81 × 10-5 25.2 300 2.71 × 10-5 37.9 400 3.62 × 10-5 50.5 500 4.52 × 10-5 63.1 600 5.42 × 10-5 75.7 700 6.33 × 10-5 88.4 800 7.23 × 10-5 101 900 8.13 × 10-5 114 1000 9.04 × 10-5 126 2000 1.81 × 10-4 252 3000 2.71 × 10-4 379 4000 3.62 × 10-4 505 5000 4.52 × 10-4 631 6000 5.42 × 10-4 757 7000 6.33 × 10-4 884 8000 7.23 × 10-4 1010 9000 8.13 × 10-4 1140 1.00 × 104 9.04 × 10-4 1260 2.00 × 104 0.00181 2520 3.00 × 104 0.00271 3790 4.00 × 104 0.00362 5050 5.00 × 104 0.00452 6310 6.00 × 104 0.00542 7570 7.00 × 104 0.00633 8840 8.00 × 104 0.00723 1.01 × 104 9.00 × 104 0.00813 1.14 × 104 1.00 × 105 0.00904 1.26 × 104 2.00 × 105 0.0181 2.52 × 104 3.00 × 105 0.0271 3.79 × 104 4.00 × 105 0.0362 5.05 × 104 5.00 × 105 0.0452 6.31 × 104 6.00 × 105 0.0542 7.57 × 104 7.00 × 105 0.0633 8.84 × 104 8.00 × 105 0.0723 1.01 × 105 9.00 × 105 0.0813 1.14 × 105 1.00 × 106 0.0904 1.26 × 105 2.00 × 106 0.181 2.52 × 105 2.35 × 106 0.213 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 5.51 × 10-5 27.7 80.0 5.58 × 10-5 28.1 90.0 6.28 × 10-5 31.6 100 6.97 × 10-5 35.1 200 1.39 × 10-4 70.1 300 2.09 × 10-4 105 400 2.79 × 10-4 140 500 3.49 × 10-4 175 600 4.18 × 10-4 210 700 4.88 × 10-4 245 800 5.58 × 10-4 281 900 6.28 × 10-4 316 1000 6.97 × 10-4 351 2000 0.00139 701 3000 0.00209 1050 4000 0.00279 1400 5000 0.00349 1750 6000 0.00418 2100 7000 0.00488 2450 8000 0.00558 2810 9000 0.00628 3160 1.00 × 104 0.00697 3510 2.00 × 104 0.0139 7010 3.00 × 104 0.0209 1.05 × 104 4.00 × 104 0.0279 1.40 × 104 5.00 × 104 0.0349 1.75 × 104 6.00 × 104 0.0418 2.10 × 104 7.00 × 104 0.0488 2.45 × 104 8.00 × 104 0.0558 2.81 × 104 9.00 × 104 0.0628 3.16 × 104 1.00 × 105 0.0697 3.51 × 104 2.00 × 105 0.139 7.01 × 104 3.00 × 105 0.209 1.05 × 105 4.00 × 105 0.279 1.40 × 105 5.00 × 105 0.349 1.75 × 105 6.00 × 105 0.418 2.10 × 105 7.00 × 105 0.488 2.45 × 105 8.00 × 105 0.558 2.81 × 105 8.47 × 105 0.591 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 8.82 × 10-4 111 80.0 8.93 × 10-4 112 90.0 0.00100 126 100 0.00112 140 200 0.00223 281 300 0.00335 421 400 0.00446 561 500 0.00558 701 600 0.00670 842 700 0.00781 982 800 0.00893 1120 900 0.0100 1260 1000 0.0112 1400 2000 0.0223 2810 3000 0.0335 4210 4000 0.0446 5610 5000 0.0558 7010 6000 0.0670 8420 7000 0.0781 9820 8000 0.0893 1.12 × 104 9000 0.100 1.26 × 104 1.00 × 104 0.112 1.40 × 104 2.00 × 104 0.223 2.81 × 104 3.00 × 104 0.335 4.21 × 104 4.00 × 104 0.446 5.61 × 104 5.00 × 104 0.558 7.01 × 104 6.00 × 104 0.670 8.42 × 104 7.00 × 104 0.781 9.82 × 104 8.00 × 104 0.893 1.12 × 105 9.00 × 104 1.00 1.26 × 105 1.00 × 105 1.12 1.40 × 105 2.00 × 105 2.23 2.81 × 105 2.12 × 105 2.36 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 0.00446 249 80.0 0.00452 252 90.0 0.00508 284 100 0.00565 316 200 0.0113 631 300 0.0169 947 400 0.0226 1260 500 0.0282 1580 600 0.0339 1890 700 0.0395 2210 800 0.0452 2520 900 0.0508 2840 1000 0.0565 3160 2000 0.113 6310 3000 0.169 9470 4000 0.226 1.26 × 104 5000 0.282 1.58 × 104 6000 0.339 1.89 × 104 7000 0.395 2.21 × 104 8000 0.452 2.52 × 104 9000 0.508 2.84 × 104 1.00 × 104 0.565 3.16 × 104 2.00 × 104 1.13 6.31 × 104 3.00 × 104 1.69 9.47 × 104 4.00 × 104 2.26 1.26 × 105 5.00 × 104 2.82 1.58 × 105 6.00 × 104 3.39 1.89 × 105 7.00 × 104 3.95 2.21 × 105 8.00 × 104 4.52 2.52 × 105 9.00 × 104 5.08 2.84 × 105 9.41 × 104 5.32 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 0.0141 443 80.0 0.0143 449 90.0 0.0161 505 100 0.0179 561 200 0.0357 1120 300 0.0536 1680 400 0.0714 2240 500 0.0893 2810 600 0.107 3370 700 0.125 3930 800 0.143 4490 900 0.161 5050 1000 0.179 5610 2000 0.357 1.12 × 104 3000 0.536 1.68 × 104 4000 0.714 2.24 × 104 5000 0.893 2.81 × 104 6000 1.07 3.37 × 104 7000 1.25 3.93 × 104 8000 1.43 4.49 × 104 9000 1.61 5.05 × 104 1.00 × 104 1.79 5.61 × 104 2.00 × 104 3.57 1.12 × 105 3.00 × 104 5.36 1.68 × 105 4.00 × 104 7.14 2.24 × 105 5.00 × 104 8.93 2.81 × 105 5.29 × 104 9.45 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 0.0344 693 80.0 0.0349 701 90.0 0.0392 789 100 0.0436 877 200 0.0872 1750 300 0.131 2630 400 0.174 3510 500 0.218 4380 600 0.262 5260 700 0.305 6140 800 0.349 7010 900 0.392 7890 1000 0.436 8770 2000 0.872 1.75 × 104 3000 1.31 2.63 × 104 4000 1.74 3.51 × 104 5000 2.18 4.38 × 104 6000 2.62 5.26 × 104 7000 3.05 6.14 × 104 8000 3.49 7.01 × 104 9000 3.92 7.89 × 104 1.00 × 104 4.36 8.77 × 104 2.00 × 104 8.72 1.75 × 105 2.84 × 104 12.4 2.49 × 105
 Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft) L = 30.0 ft (lbf/ft) (in) (psi) 79.0 0.0714 997 80.0 0.0723 1010 90.0 0.0813 1140 100 0.0904 1260 200 0.181 2520 300 0.271 3790 400 0.362 5050 500 0.452 6310 600 0.542 7570 700 0.633 8840 800 0.723 1.01 × 104 900 0.813 1.14 × 104 1000 0.904 1.26 × 104 2000 1.81 2.52 × 104 3000 2.71 3.79 × 104 4000 3.62 5.05 × 104 5000 4.52 6.31 × 104 6000 5.42 7.57 × 104 7000 6.33 8.84 × 104 8000 7.23 1.01 × 105 9000 8.13 1.14 × 105 1.00 × 104 9.04 1.26 × 105 1.37 × 104 12.4 1.73 × 105
 Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft) L = 40.0 ft (lbf/ft) (in) (psi) 79.0 0.226 1770 80.0 0.229 1800 90.0 0.257 2020 100 0.286 2240 200 0.571 4490 300 0.857 6730 400 1.14 8980 500 1.43 1.12 × 104 600 1.71 1.35 × 104 700 2.00 1.57 × 104 800 2.29 1.80 × 104 900 2.57 2.02 × 104 1000 2.86 2.24 × 104 2000 5.71 4.49 × 104 3000 8.57 6.73 × 104 4000 11.4 8.98 × 104 4330 12.4 9.73 × 104
 Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft) L = 50.0 ft (lbf/ft) (in) (psi) 79.0 0.551 2770 80.0 0.558 2810 90.0 0.628 3160 100 0.697 3510 200 1.39 7010 300 2.09 1.05 × 104 400 2.79 1.40 × 104 500 3.49 1.75 × 104 600 4.18 2.10 × 104 700 4.88 2.45 × 104 800 5.58 2.81 × 104 900 6.28 3.16 × 104 1000 6.97 3.51 × 104 1780 12.4 6.22 × 104
 Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft) L = 60.0 ft (lbf/ft) (in) (psi) 79.0 1.14 3990 80.0 1.16 4040 90.0 1.30 4540 100 1.45 5050 200 2.89 1.01 × 104 300 4.34 1.51 × 104 400 5.78 2.02 × 104 500 7.23 2.52 × 104 600 8.68 3.03 × 104 700 10.1 3.53 × 104 800 11.6 4.04 × 104 856 12.4 4.32 × 104
 Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft) L = 70.0 ft (lbf/ft) (in) (psi) 79.0 2.12 5430 80.0 2.14 5500 90.0 2.41 6190 100 2.68 6870 200 5.36 1.37 × 104 300 8.04 2.06 × 104 400 10.7 2.75 × 104 462 12.4 3.18 × 104
 Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft) L = 80.0 ft (lbf/ft) (in) (psi) 79.0 3.61 7090 80.0 3.66 7180 90.0 4.11 8080 100 4.57 8980 200 9.14 1.80 × 104 271 12.4 2.43 × 104
 Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft) L = 90.0 ft (lbf/ft) (in) (psi) 79.0 5.78 8980 80.0 5.86 9090 90.0 6.59 1.02 × 104 100 7.32 1.14 × 104 169 12.4 1.92 × 104
 Steel I Beam: W12 × 79 (Wide Flange 12 inch tall × 79 lbf/ft) L = 100 ft (lbf/ft) (in) (psi) 79.0 8.82 1.11 × 104 80.0 8.93 1.12 × 104 90.0 10.0 1.26 × 104 100 11.2 1.40 × 104 111 12.4 1.56 × 104