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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two Equal Spans » S Section Steel I Beam » S20 × 66
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 = 1190 in4) for the S20 × 66 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: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 3.00 ft (lbf/ft) (in) (psi) 66.0 1.33 × 10-6 7.49 70.0 1.41 × 10-6 7.94 80.0 1.61 × 10-6 9.08 90.0 1.81 × 10-6 10.2 100 2.01 × 10-6 11.3 200 4.02 × 10-6 22.7 300 6.03 × 10-6 34.0 400 8.05 × 10-6 45.4 500 1.01 × 10-5 56.7 600 1.21 × 10-5 68.1 700 1.41 × 10-5 79.4 800 1.61 × 10-5 90.8 900 1.81 × 10-5 102 1000 2.01 × 10-5 113 2000 4.02 × 10-5 227 3000 6.03 × 10-5 340 4000 8.05 × 10-5 454 5000 1.01 × 10-4 567 6000 1.21 × 10-4 681 7000 1.41 × 10-4 794 8000 1.61 × 10-4 908 9000 1.81 × 10-4 1020 1.00 × 104 2.01 × 10-4 1130 2.00 × 104 4.02 × 10-4 2270 3.00 × 104 6.03 × 10-4 3400 4.00 × 104 8.05 × 10-4 4540 5.00 × 104 0.00101 5670 6.00 × 104 0.00121 6810 7.00 × 104 0.00141 7940 8.00 × 104 0.00161 9080 9.00 × 104 0.00181 1.02 × 104 1.00 × 105 0.00201 1.13 × 104 2.00 × 105 0.00402 2.27 × 104 3.00 × 105 0.00603 3.40 × 104 4.00 × 105 0.00805 4.54 × 104 5.00 × 105 0.0101 5.67 × 104 6.00 × 105 0.0121 6.81 × 104 7.00 × 105 0.0141 7.94 × 104 8.00 × 105 0.0161 9.08 × 104 9.00 × 105 0.0181 1.02 × 105 1.00 × 106 0.0201 1.13 × 105 2.00 × 106 0.0402 2.27 × 105 2.62 × 106 0.0527 2.97 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 5.00 ft (lbf/ft) (in) (psi) 66.0 1.02 × 10-5 20.8 70.0 1.09 × 10-5 22.1 80.0 1.24 × 10-5 25.2 90.0 1.40 × 10-5 28.4 100 1.55 × 10-5 31.5 200 3.10 × 10-5 63.0 300 4.66 × 10-5 94.5 400 6.21 × 10-5 126 500 7.76 × 10-5 158 600 9.31 × 10-5 189 700 1.09 × 10-4 221 800 1.24 × 10-4 252 900 1.40 × 10-4 284 1000 1.55 × 10-4 315 2000 3.10 × 10-4 630 3000 4.66 × 10-4 945 4000 6.21 × 10-4 1260 5000 7.76 × 10-4 1580 6000 9.31 × 10-4 1890 7000 0.00109 2210 8000 0.00124 2520 9000 0.00140 2840 1.00 × 104 0.00155 3150 2.00 × 104 0.00310 6300 3.00 × 104 0.00466 9450 4.00 × 104 0.00621 1.26 × 104 5.00 × 104 0.00776 1.58 × 104 6.00 × 104 0.00931 1.89 × 104 7.00 × 104 0.0109 2.21 × 104 8.00 × 104 0.0124 2.52 × 104 9.00 × 104 0.0140 2.84 × 104 1.00 × 105 0.0155 3.15 × 104 2.00 × 105 0.0310 6.30 × 104 3.00 × 105 0.0466 9.45 × 104 4.00 × 105 0.0621 1.26 × 105 5.00 × 105 0.0776 1.58 × 105 6.00 × 105 0.0931 1.89 × 105 7.00 × 105 0.109 2.21 × 105 8.00 × 105 0.124 2.52 × 105 9.00 × 105 0.140 2.84 × 105 9.43 × 105 0.146 2.97 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 10.0 ft (lbf/ft) (in) (psi) 66.0 1.64 × 10-4 83.2 70.0 1.74 × 10-4 88.2 80.0 1.99 × 10-4 101 90.0 2.23 × 10-4 113 100 2.48 × 10-4 126 200 4.97 × 10-4 252 300 7.45 × 10-4 378 400 9.93 × 10-4 504 500 0.00124 630 600 0.00149 756 700 0.00174 882 800 0.00199 1010 900 0.00223 1130 1000 0.00248 1260 2000 0.00497 2520 3000 0.00745 3780 4000 0.00993 5040 5000 0.0124 6300 6000 0.0149 7560 7000 0.0174 8820 8000 0.0199 1.01 × 104 9000 0.0223 1.13 × 104 1.00 × 104 0.0248 1.26 × 104 2.00 × 104 0.0497 2.52 × 104 3.00 × 104 0.0745 3.78 × 104 4.00 × 104 0.0993 5.04 × 104 5.00 × 104 0.124 6.30 × 104 6.00 × 104 0.149 7.56 × 104 7.00 × 104 0.174 8.82 × 104 8.00 × 104 0.199 1.01 × 105 9.00 × 104 0.223 1.13 × 105 1.00 × 105 0.248 1.26 × 105 2.00 × 105 0.497 2.52 × 105 2.36 × 105 0.585 2.97 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 15.0 ft (lbf/ft) (in) (psi) 66.0 8.30 × 10-4 187 70.0 8.80 × 10-4 199 80.0 0.00101 227 90.0 0.00113 255 100 0.00126 284 200 0.00251 567 300 0.00377 851 400 0.00503 1130 500 0.00629 1420 600 0.00754 1700 700 0.00880 1990 800 0.0101 2270 900 0.0113 2550 1000 0.0126 2840 2000 0.0251 5670 3000 0.0377 8510 4000 0.0503 1.13 × 104 5000 0.0629 1.42 × 104 6000 0.0754 1.70 × 104 7000 0.0880 1.99 × 104 8000 0.101 2.27 × 104 9000 0.113 2.55 × 104 1.00 × 104 0.126 2.84 × 104 2.00 × 104 0.251 5.67 × 104 3.00 × 104 0.377 8.51 × 104 4.00 × 104 0.503 1.13 × 105 5.00 × 104 0.629 1.42 × 105 6.00 × 104 0.754 1.70 × 105 7.00 × 104 0.880 1.99 × 105 8.00 × 104 1.01 2.27 × 105 9.00 × 104 1.13 2.55 × 105 1.00 × 105 1.26 2.84 × 105 1.05 × 105 1.32 2.97 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 20.0 ft (lbf/ft) (in) (psi) 66.0 0.00262 333 70.0 0.00278 353 80.0 0.00318 403 90.0 0.00358 454 100 0.00397 504 200 0.00795 1010 300 0.0119 1510 400 0.0159 2020 500 0.0199 2520 600 0.0238 3030 700 0.0278 3530 800 0.0318 4030 900 0.0358 4540 1000 0.0397 5040 2000 0.0795 1.01 × 104 3000 0.119 1.51 × 104 4000 0.159 2.02 × 104 5000 0.199 2.52 × 104 6000 0.238 3.03 × 104 7000 0.278 3.53 × 104 8000 0.318 4.03 × 104 9000 0.358 4.54 × 104 1.00 × 104 0.397 5.04 × 104 2.00 × 104 0.795 1.01 × 105 3.00 × 104 1.19 1.51 × 105 4.00 × 104 1.59 2.02 × 105 5.00 × 104 1.99 2.52 × 105 5.89 × 104 2.34 2.97 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 25.0 ft (lbf/ft) (in) (psi) 66.0 0.00640 520 70.0 0.00679 551 80.0 0.00776 630 90.0 0.00873 709 100 0.00970 788 200 0.0194 1580 300 0.0291 2360 400 0.0388 3150 500 0.0485 3940 600 0.0582 4730 700 0.0679 5510 800 0.0776 6300 900 0.0873 7090 1000 0.0970 7880 2000 0.194 1.58 × 104 3000 0.291 2.36 × 104 4000 0.388 3.15 × 104 5000 0.485 3.94 × 104 6000 0.582 4.73 × 104 7000 0.679 5.51 × 104 8000 0.776 6.30 × 104 9000 0.873 7.09 × 104 1.00 × 104 0.970 7.88 × 104 2.00 × 104 1.94 1.58 × 105 3.00 × 104 2.91 2.36 × 105 3.77 × 104 3.66 2.97 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 30.0 ft (lbf/ft) (in) (psi) 66.0 0.0133 749 70.0 0.0141 794 80.0 0.0161 908 90.0 0.0181 1020 100 0.0201 1130 200 0.0402 2270 300 0.0603 3400 400 0.0805 4540 500 0.101 5670 600 0.121 6810 700 0.141 7940 800 0.161 9080 900 0.181 1.02 × 104 1000 0.201 1.13 × 104 2000 0.402 2.27 × 104 3000 0.603 3.40 × 104 4000 0.805 4.54 × 104 5000 1.01 5.67 × 104 6000 1.21 6.81 × 104 7000 1.41 7.94 × 104 8000 1.61 9.08 × 104 9000 1.81 1.02 × 105 1.00 × 104 2.01 1.13 × 105 2.00 × 104 4.02 2.27 × 105 2.62 × 104 5.27 2.97 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 40.0 ft (lbf/ft) (in) (psi) 66.0 0.0420 1330 70.0 0.0445 1410 80.0 0.0509 1610 90.0 0.0572 1820 100 0.0636 2020 200 0.127 4030 300 0.191 6050 400 0.254 8070 500 0.318 1.01 × 104 600 0.381 1.21 × 104 700 0.445 1.41 × 104 800 0.509 1.61 × 104 900 0.572 1.82 × 104 1000 0.636 2.02 × 104 2000 1.27 4.03 × 104 3000 1.91 6.05 × 104 4000 2.54 8.07 × 104 5000 3.18 1.01 × 105 6000 3.81 1.21 × 105 7000 4.45 1.41 × 105 8000 5.09 1.61 × 105 9000 5.72 1.82 × 105 1.00 × 104 6.36 2.02 × 105 1.47 × 104 9.36 2.97 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 50.0 ft (lbf/ft) (in) (psi) 66.0 0.102 2080 70.0 0.109 2210 80.0 0.124 2520 90.0 0.140 2840 100 0.155 3150 200 0.310 6300 300 0.466 9450 400 0.621 1.26 × 104 500 0.776 1.58 × 104 600 0.931 1.89 × 104 700 1.09 2.21 × 104 800 1.24 2.52 × 104 900 1.40 2.84 × 104 1000 1.55 3.15 × 104 2000 3.10 6.30 × 104 3000 4.66 9.45 × 104 4000 6.21 1.26 × 105 5000 7.76 1.58 × 105 6000 9.31 1.89 × 105 7000 10.9 2.21 × 105 8000 12.4 2.52 × 105 9000 14.0 2.84 × 105 9430 14.6 2.97 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 60.0 ft (lbf/ft) (in) (psi) 66.0 0.212 2990 70.0 0.225 3180 80.0 0.257 3630 90.0 0.290 4080 100 0.322 4540 200 0.644 9080 300 0.965 1.36 × 104 400 1.29 1.82 × 104 500 1.61 2.27 × 104 600 1.93 2.72 × 104 700 2.25 3.18 × 104 800 2.57 3.63 × 104 900 2.90 4.08 × 104 1000 3.22 4.54 × 104 2000 6.44 9.08 × 104 3000 9.65 1.36 × 105 4000 12.9 1.82 × 105 5000 16.1 2.27 × 105 6000 19.3 2.72 × 105 6550 21.1 2.97 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 70.0 ft (lbf/ft) (in) (psi) 66.0 0.393 4080 70.0 0.417 4320 80.0 0.477 4940 90.0 0.537 5560 100 0.596 6180 200 1.19 1.24 × 104 300 1.79 1.85 × 104 400 2.38 2.47 × 104 500 2.98 3.09 × 104 600 3.58 3.71 × 104 700 4.17 4.32 × 104 800 4.77 4.94 × 104 900 5.37 5.56 × 104 1000 5.96 6.18 × 104 2000 11.9 1.24 × 105 3000 17.9 1.85 × 105 3350 20.0 2.07 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 80.0 ft (lbf/ft) (in) (psi) 66.0 0.671 5320 70.0 0.712 5650 80.0 0.814 6450 90.0 0.915 7260 100 1.02 8070 200 2.03 1.61 × 104 300 3.05 2.42 × 104 400 4.07 3.23 × 104 500 5.09 4.03 × 104 600 6.10 4.84 × 104 700 7.12 5.65 × 104 800 8.14 6.45 × 104 900 9.15 7.26 × 104 1000 10.2 8.07 × 104 1970 20.0 1.59 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 90.0 ft (lbf/ft) (in) (psi) 66.0 1.08 6740 70.0 1.14 7150 80.0 1.30 8170 90.0 1.47 9190 100 1.63 1.02 × 104 200 3.26 2.04 × 104 300 4.89 3.06 × 104 400 6.52 4.08 × 104 500 8.15 5.11 × 104 600 9.77 6.13 × 104 700 11.4 7.15 × 104 800 13.0 8.17 × 104 900 14.7 9.19 × 104 1000 16.3 1.02 × 105 1230 20.0 1.25 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 100 ft (lbf/ft) (in) (psi) 66.0 1.64 8320 70.0 1.74 8820 80.0 1.99 1.01 × 104 90.0 2.23 1.13 × 104 100 2.48 1.26 × 104 200 4.97 2.52 × 104 300 7.45 3.78 × 104 400 9.93 5.04 × 104 500 12.4 6.30 × 104 600 14.9 7.56 × 104 700 17.4 8.82 × 104 800 19.9 1.01 × 105 805 20.0 1.02 × 105
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 125 ft (lbf/ft) (in) (psi) 66.0 4.00 1.30 × 104 70.0 4.24 1.38 × 104 80.0 4.85 1.58 × 104 90.0 5.46 1.77 × 104 100 6.06 1.97 × 104 200 12.1 3.94 × 104 300 18.2 5.91 × 104 330 20.0 6.50 × 104
 Steel I Beam: S20 × 66 (S20 inch tall × 66 lbf/ft) L = 150 ft (lbf/ft) (in) (psi) 66.0 8.30 1.87 × 104 70.0 8.80 1.99 × 104 80.0 10.1 2.27 × 104 90.0 11.3 2.55 × 104 100 12.6 2.84 × 104 159 20.0 4.51 × 104
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