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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two Equal Spans » S Section Steel I Beam » S6 × 12.5
S Section Steel I Beam | Single Span | Two Equal Spans | Three Equal Spans | Four Equal Spans

For a simply supported beam in two equal spans, we compute the displacement at the middle of each span and the maximum normal stress occuring at the center support of the beam.
The tabulated data listed in this page are calculated based on the area moment of inertia (Ixx = 22.1 in4) for the S6 × 12.5 S Section 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: S6 × 12.5 (S6 inch tall × 12.5 lbf/ft) L = 3.00 ft (lbf/ft) (in) (psi) 12.5 1.35 × 10-5 22.9 20.0 2.17 × 10-5 36.7 30.0 3.25 × 10-5 55.0 40.0 4.33 × 10-5 73.3 50.0 5.42 × 10-5 91.6 60.0 6.50 × 10-5 110 70.0 7.58 × 10-5 128 80.0 8.66 × 10-5 147 90.0 9.75 × 10-5 165 100 1.08 × 10-4 183 200 2.17 × 10-4 367 300 3.25 × 10-4 550 400 4.33 × 10-4 733 500 5.42 × 10-4 916 600 6.50 × 10-4 1100 700 7.58 × 10-4 1280 800 8.66 × 10-4 1470 900 9.75 × 10-4 1650 1000 0.00108 1830 2000 0.00217 3670 3000 0.00325 5500 4000 0.00433 7330 5000 0.00542 9160 6000 0.00650 1.10 × 104 7000 0.00758 1.28 × 104 8000 0.00866 1.47 × 104 9000 0.00975 1.65 × 104 1.00 × 104 0.0108 1.83 × 104 2.00 × 104 0.0217 3.67 × 104 3.00 × 104 0.0325 5.50 × 104 4.00 × 104 0.0433 7.33 × 104 5.00 × 104 0.0542 9.16 × 104 6.00 × 104 0.0650 1.10 × 105 7.00 × 104 0.0758 1.28 × 105 8.00 × 104 0.0866 1.47 × 105 9.00 × 104 0.0975 1.65 × 105 1.00 × 105 0.108 1.83 × 105 1.62 × 105 0.176 2.97 × 105
 Steel I Beam: S6 × 12.5 (S6 inch tall × 12.5 lbf/ft) L = 5.00 ft (lbf/ft) (in) (psi) 12.5 1.04 × 10-4 63.6 20.0 1.67 × 10-4 102 30.0 2.51 × 10-4 153 40.0 3.34 × 10-4 204 50.0 4.18 × 10-4 255 60.0 5.01 × 10-4 305 70.0 5.85 × 10-4 356 80.0 6.69 × 10-4 407 90.0 7.52 × 10-4 458 100 8.36 × 10-4 509 200 0.00167 1020 300 0.00251 1530 400 0.00334 2040 500 0.00418 2550 600 0.00501 3050 700 0.00585 3560 800 0.00669 4070 900 0.00752 4580 1000 0.00836 5090 2000 0.0167 1.02 × 104 3000 0.0251 1.53 × 104 4000 0.0334 2.04 × 104 5000 0.0418 2.55 × 104 6000 0.0501 3.05 × 104 7000 0.0585 3.56 × 104 8000 0.0669 4.07 × 104 9000 0.0752 4.58 × 104 1.00 × 104 0.0836 5.09 × 104 2.00 × 104 0.167 1.02 × 105 3.00 × 104 0.251 1.53 × 105 4.00 × 104 0.334 2.04 × 105 5.00 × 104 0.418 2.55 × 105 5.84 × 104 0.488 2.97 × 105
 Steel I Beam: S6 × 12.5 (S6 inch tall × 12.5 lbf/ft) L = 10.0 ft (lbf/ft) (in) (psi) 12.5 0.00167 255 20.0 0.00267 407 30.0 0.00401 611 40.0 0.00535 814 50.0 0.00669 1020 60.0 0.00802 1220 70.0 0.00936 1430 80.0 0.0107 1630 90.0 0.0120 1830 100 0.0134 2040 200 0.0267 4070 300 0.0401 6110 400 0.0535 8140 500 0.0669 1.02 × 104 600 0.0802 1.22 × 104 700 0.0936 1.43 × 104 800 0.107 1.63 × 104 900 0.120 1.83 × 104 1000 0.134 2.04 × 104 2000 0.267 4.07 × 104 3000 0.401 6.11 × 104 4000 0.535 8.14 × 104 5000 0.669 1.02 × 105 6000 0.802 1.22 × 105 7000 0.936 1.43 × 105 8000 1.07 1.63 × 105 9000 1.20 1.83 × 105 1.00 × 104 1.34 2.04 × 105 1.46 × 104 1.95 2.97 × 105
 Steel I Beam: S6 × 12.5 (S6 inch tall × 12.5 lbf/ft) L = 15.0 ft (lbf/ft) (in) (psi) 12.5 0.00846 573 20.0 0.0135 916 30.0 0.0203 1370 40.0 0.0271 1830 50.0 0.0338 2290 60.0 0.0406 2750 70.0 0.0474 3210 80.0 0.0542 3670 90.0 0.0609 4120 100 0.0677 4580 200 0.135 9160 300 0.203 1.37 × 104 400 0.271 1.83 × 104 500 0.338 2.29 × 104 600 0.406 2.75 × 104 700 0.474 3.21 × 104 800 0.542 3.67 × 104 900 0.609 4.12 × 104 1000 0.677 4.58 × 104 2000 1.35 9.16 × 104 3000 2.03 1.37 × 105 4000 2.71 1.83 × 105 5000 3.38 2.29 × 105 6000 4.06 2.75 × 105 6480 4.39 2.97 × 105
 Steel I Beam: S6 × 12.5 (S6 inch tall × 12.5 lbf/ft) L = 20.0 ft (lbf/ft) (in) (psi) 12.5 0.0267 1020 20.0 0.0428 1630 30.0 0.0642 2440 40.0 0.0856 3260 50.0 0.107 4070 60.0 0.128 4890 70.0 0.150 5700 80.0 0.171 6520 90.0 0.193 7330 100 0.214 8140 200 0.428 1.63 × 104 300 0.642 2.44 × 104 400 0.856 3.26 × 104 500 1.07 4.07 × 104 600 1.28 4.89 × 104 700 1.50 5.70 × 104 800 1.71 6.52 × 104 900 1.93 7.33 × 104 1000 2.14 8.14 × 104 2000 4.28 1.63 × 105 2800 6.00 2.28 × 105
 Steel I Beam: S6 × 12.5 (S6 inch tall × 12.5 lbf/ft) L = 25.0 ft (lbf/ft) (in) (psi) 12.5 0.0653 1590 20.0 0.104 2550 30.0 0.157 3820 40.0 0.209 5090 50.0 0.261 6360 60.0 0.313 7640 70.0 0.366 8910 80.0 0.418 1.02 × 104 90.0 0.470 1.15 × 104 100 0.522 1.27 × 104 200 1.04 2.55 × 104 300 1.57 3.82 × 104 400 2.09 5.09 × 104 500 2.61 6.36 × 104 600 3.13 7.64 × 104 700 3.66 8.91 × 104 800 4.18 1.02 × 105 900 4.70 1.15 × 105 1000 5.22 1.27 × 105 1150 6.00 1.46 × 105
 Steel I Beam: S6 × 12.5 (S6 inch tall × 12.5 lbf/ft) L = 30.0 ft (lbf/ft) (in) (psi) 12.5 0.135 2290 20.0 0.217 3670 30.0 0.325 5500 40.0 0.433 7330 50.0 0.542 9160 60.0 0.650 1.10 × 104 70.0 0.758 1.28 × 104 80.0 0.866 1.47 × 104 90.0 0.975 1.65 × 104 100 1.08 1.83 × 104 200 2.17 3.67 × 104 300 3.25 5.50 × 104 400 4.33 7.33 × 104 500 5.42 9.16 × 104 554 6.00 1.02 × 105
 Steel I Beam: S6 × 12.5 (S6 inch tall × 12.5 lbf/ft) L = 40.0 ft (lbf/ft) (in) (psi) 12.5 0.428 4070 20.0 0.685 6520 30.0 1.03 9770 40.0 1.37 1.30 × 104 50.0 1.71 1.63 × 104 60.0 2.05 1.95 × 104 70.0 2.40 2.28 × 104 80.0 2.74 2.61 × 104 90.0 3.08 2.93 × 104 100 3.42 3.26 × 104 175 6.00 5.71 × 104
 Steel I Beam: S6 × 12.5 (S6 inch tall × 12.5 lbf/ft) L = 50.0 ft (lbf/ft) (in) (psi) 12.5 1.04 6360 20.0 1.67 1.02 × 104 30.0 2.51 1.53 × 104 40.0 3.34 2.04 × 104 50.0 4.18 2.55 × 104 60.0 5.01 3.05 × 104 70.0 5.85 3.56 × 104 71.8 6.00 3.65 × 104
 Steel I Beam: S6 × 12.5 (S6 inch tall × 12.5 lbf/ft) L = 60.0 ft (lbf/ft) (in) (psi) 12.5 2.17 9160 20.0 3.47 1.47 × 104 30.0 5.20 2.20 × 104 34.6 6.00 2.54 × 104
 Steel I Beam: S6 × 12.5 (S6 inch tall × 12.5 lbf/ft) L = 70.0 ft (lbf/ft) (in) (psi) 12.5 4.01 1.25 × 104 18.7 6.00 1.86 × 104
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