Wide Flange Steel I Beam: W18 × 40

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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » Wide Flange Steel I Beam » W18 × 40

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 = 612 in4) for the W18 × 40 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: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 3.00 ft (lbf/ft) (in) (psi) 40.0 3.91 × 10-6 7.90 50.0 4.89 × 10-6 9.87 60.0 5.87 × 10-6 11.8 70.0 6.84 × 10-6 13.8 80.0 7.82 × 10-6 15.8 90.0 8.80 × 10-6 17.8 100 9.78 × 10-6 19.7 200 1.96 × 10-5 39.5 300 2.93 × 10-5 59.2 400 3.91 × 10-5 79.0 500 4.89 × 10-5 98.7 600 5.87 × 10-5 118 700 6.84 × 10-5 138 800 7.82 × 10-5 158 900 8.80 × 10-5 178 1000 9.78 × 10-5 197 2000 1.96 × 10-4 395 3000 2.93 × 10-4 592 4000 3.91 × 10-4 790 5000 4.89 × 10-4 987 6000 5.87 × 10-4 1180 7000 6.84 × 10-4 1380 8000 7.82 × 10-4 1580 9000 8.80 × 10-4 1780 1.00 × 104 9.78 × 10-4 1970 2.00 × 104 0.00196 3950 3.00 × 104 0.00293 5920 4.00 × 104 0.00391 7900 5.00 × 104 0.00489 9870 6.00 × 104 0.00587 1.18 × 104 7.00 × 104 0.00684 1.38 × 104 8.00 × 104 0.00782 1.58 × 104 9.00 × 104 0.00880 1.78 × 104 1.00 × 105 0.00978 1.97 × 104 2.00 × 105 0.0196 3.95 × 104 3.00 × 105 0.0293 5.92 × 104 4.00 × 105 0.0391 7.90 × 104 5.00 × 105 0.0489 9.87 × 104 6.00 × 105 0.0587 1.18 × 105 7.00 × 105 0.0684 1.38 × 105 8.00 × 105 0.0782 1.58 × 105 9.00 × 105 0.0880 1.78 × 105 1.00 × 106 0.0978 1.97 × 105 1.50 × 106 0.147 2.97 × 105
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 5.00 ft (lbf/ft) (in) (psi) 40.0 3.02 × 10-5 21.9 50.0 3.77 × 10-5 27.4 60.0 4.53 × 10-5 32.9 70.0 5.28 × 10-5 38.4 80.0 6.04 × 10-5 43.9 90.0 6.79 × 10-5 49.4 100 7.54 × 10-5 54.8 200 1.51 × 10-4 110 300 2.26 × 10-4 165 400 3.02 × 10-4 219 500 3.77 × 10-4 274 600 4.53 × 10-4 329 700 5.28 × 10-4 384 800 6.04 × 10-4 439 900 6.79 × 10-4 494 1000 7.54 × 10-4 548 2000 0.00151 1100 3000 0.00226 1650 4000 0.00302 2190 5000 0.00377 2740 6000 0.00453 3290 7000 0.00528 3840 8000 0.00604 4390 9000 0.00679 4940 1.00 × 104 0.00754 5480 2.00 × 104 0.0151 1.10 × 104 3.00 × 104 0.0226 1.65 × 104 4.00 × 104 0.0302 2.19 × 104 5.00 × 104 0.0377 2.74 × 104 6.00 × 104 0.0453 3.29 × 104 7.00 × 104 0.0528 3.84 × 104 8.00 × 104 0.0604 4.39 × 104 9.00 × 104 0.0679 4.94 × 104 1.00 × 105 0.0754 5.48 × 104 2.00 × 105 0.151 1.10 × 105 3.00 × 105 0.226 1.65 × 105 4.00 × 105 0.302 2.19 × 105 5.00 × 105 0.377 2.74 × 105 5.42 × 105 0.409 2.97 × 105
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 10.0 ft (lbf/ft) (in) (psi) 40.0 4.83 × 10-4 87.7 50.0 6.04 × 10-4 110 60.0 7.24 × 10-4 132 70.0 8.45 × 10-4 154 80.0 9.66 × 10-4 175 90.0 0.00109 197 100 0.00121 219 200 0.00241 439 300 0.00362 658 400 0.00483 877 500 0.00604 1100 600 0.00724 1320 700 0.00845 1540 800 0.00966 1750 900 0.0109 1970 1000 0.0121 2190 2000 0.0241 4390 3000 0.0362 6580 4000 0.0483 8770 5000 0.0604 1.10 × 104 6000 0.0724 1.32 × 104 7000 0.0845 1.54 × 104 8000 0.0966 1.75 × 104 9000 0.109 1.97 × 104 1.00 × 104 0.121 2.19 × 104 2.00 × 104 0.241 4.39 × 104 3.00 × 104 0.362 6.58 × 104 4.00 × 104 0.483 8.77 × 104 5.00 × 104 0.604 1.10 × 105 6.00 × 104 0.724 1.32 × 105 7.00 × 104 0.845 1.54 × 105 8.00 × 104 0.966 1.75 × 105 9.00 × 104 1.09 1.97 × 105 1.00 × 105 1.21 2.19 × 105 1.35 × 105 1.63 2.97 × 105
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 15.0 ft (lbf/ft) (in) (psi) 40.0 0.00244 197 50.0 0.00306 247 60.0 0.00367 296 70.0 0.00428 345 80.0 0.00489 395 90.0 0.00550 444 100 0.00611 494 200 0.0122 987 300 0.0183 1480 400 0.0244 1970 500 0.0306 2470 600 0.0367 2960 700 0.0428 3450 800 0.0489 3950 900 0.0550 4440 1000 0.0611 4940 2000 0.122 9870 3000 0.183 1.48 × 104 4000 0.244 1.97 × 104 5000 0.306 2.47 × 104 6000 0.367 2.96 × 104 7000 0.428 3.45 × 104 8000 0.489 3.95 × 104 9000 0.550 4.44 × 104 1.00 × 104 0.611 4.94 × 104 2.00 × 104 1.22 9.87 × 104 3.00 × 104 1.83 1.48 × 105 4.00 × 104 2.44 1.97 × 105 5.00 × 104 3.06 2.47 × 105 6.00 × 104 3.67 2.96 × 105 6.02 × 104 3.68 2.97 × 105
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 20.0 ft (lbf/ft) (in) (psi) 40.0 0.00773 351 50.0 0.00966 439 60.0 0.0116 526 70.0 0.0135 614 80.0 0.0155 702 90.0 0.0174 790 100 0.0193 877 200 0.0386 1750 300 0.0579 2630 400 0.0773 3510 500 0.0966 4390 600 0.116 5260 700 0.135 6140 800 0.155 7020 900 0.174 7900 1000 0.193 8770 2000 0.386 1.75 × 104 3000 0.579 2.63 × 104 4000 0.773 3.51 × 104 5000 0.966 4.39 × 104 6000 1.16 5.26 × 104 7000 1.35 6.14 × 104 8000 1.55 7.02 × 104 9000 1.74 7.90 × 104 1.00 × 104 1.93 8.77 × 104 2.00 × 104 3.86 1.75 × 105 3.00 × 104 5.79 2.63 × 105 3.39 × 104 6.54 2.97 × 105
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 25.0 ft (lbf/ft) (in) (psi) 40.0 0.0189 548 50.0 0.0236 686 60.0 0.0283 823 70.0 0.0330 960 80.0 0.0377 1100 90.0 0.0424 1230 100 0.0472 1370 200 0.0943 2740 300 0.141 4110 400 0.189 5480 500 0.236 6860 600 0.283 8230 700 0.330 9600 800 0.377 1.10 × 104 900 0.424 1.23 × 104 1000 0.472 1.37 × 104 2000 0.943 2.74 × 104 3000 1.41 4.11 × 104 4000 1.89 5.48 × 104 5000 2.36 6.86 × 104 6000 2.83 8.23 × 104 7000 3.30 9.60 × 104 8000 3.77 1.10 × 105 9000 4.24 1.23 × 105 1.00 × 104 4.72 1.37 × 105 2.00 × 104 9.43 2.74 × 105 2.17 × 104 10.2 2.97 × 105
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 30.0 ft (lbf/ft) (in) (psi) 40.0 0.0391 790 50.0 0.0489 987 60.0 0.0587 1180 70.0 0.0684 1380 80.0 0.0782 1580 90.0 0.0880 1780 100 0.0978 1970 200 0.196 3950 300 0.293 5920 400 0.391 7900 500 0.489 9870 600 0.587 1.18 × 104 700 0.684 1.38 × 104 800 0.782 1.58 × 104 900 0.880 1.78 × 104 1000 0.978 1.97 × 104 2000 1.96 3.95 × 104 3000 2.93 5.92 × 104 4000 3.91 7.90 × 104 5000 4.89 9.87 × 104 6000 5.87 1.18 × 105 7000 6.84 1.38 × 105 8000 7.82 1.58 × 105 9000 8.80 1.78 × 105 1.00 × 104 9.78 1.97 × 105 1.50 × 104 14.7 2.97 × 105
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 40.0 ft (lbf/ft) (in) (psi) 40.0 0.124 1400 50.0 0.155 1750 60.0 0.185 2110 70.0 0.216 2460 80.0 0.247 2810 90.0 0.278 3160 100 0.309 3510 200 0.618 7020 300 0.927 1.05 × 104 400 1.24 1.40 × 104 500 1.55 1.75 × 104 600 1.85 2.11 × 104 700 2.16 2.46 × 104 800 2.47 2.81 × 104 900 2.78 3.16 × 104 1000 3.09 3.51 × 104 2000 6.18 7.02 × 104 3000 9.27 1.05 × 105 4000 12.4 1.40 × 105 5000 15.5 1.75 × 105 5790 17.9 2.03 × 105
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 50.0 ft (lbf/ft) (in) (psi) 40.0 0.302 2190 50.0 0.377 2740 60.0 0.453 3290 70.0 0.528 3840 80.0 0.604 4390 90.0 0.679 4940 100 0.754 5480 200 1.51 1.10 × 104 300 2.26 1.65 × 104 400 3.02 2.19 × 104 500 3.77 2.74 × 104 600 4.53 3.29 × 104 700 5.28 3.84 × 104 800 6.04 4.39 × 104 900 6.79 4.94 × 104 1000 7.54 5.48 × 104 2000 15.1 1.10 × 105 2370 17.9 1.30 × 105
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 60.0 ft (lbf/ft) (in) (psi) 40.0 0.626 3160 50.0 0.782 3950 60.0 0.939 4740 70.0 1.10 5530 80.0 1.25 6320 90.0 1.41 7110 100 1.56 7900 200 3.13 1.58 × 104 300 4.69 2.37 × 104 400 6.26 3.16 × 104 500 7.82 3.95 × 104 600 9.39 4.74 × 104 700 11.0 5.53 × 104 800 12.5 6.32 × 104 900 14.1 7.11 × 104 1000 15.6 7.90 × 104 1140 17.9 9.04 × 104
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 70.0 ft (lbf/ft) (in) (psi) 40.0 1.16 4300 50.0 1.45 5370 60.0 1.74 6450 70.0 2.03 7520 80.0 2.32 8600 90.0 2.61 9670 100 2.90 1.07 × 104 200 5.80 2.15 × 104 300 8.69 3.22 × 104 400 11.6 4.30 × 104 500 14.5 5.37 × 104 600 17.4 6.45 × 104 618 17.9 6.64 × 104
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 80.0 ft (lbf/ft) (in) (psi) 40.0 1.98 5620 50.0 2.47 7020 60.0 2.97 8420 70.0 3.46 9830 80.0 3.96 1.12 × 104 90.0 4.45 1.26 × 104 100 4.94 1.40 × 104 200 9.89 2.81 × 104 300 14.8 4.21 × 104 362 17.9 5.08 × 104
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 90.0 ft (lbf/ft) (in) (psi) 40.0 3.17 7110 50.0 3.96 8880 60.0 4.75 1.07 × 104 70.0 5.54 1.24 × 104 80.0 6.34 1.42 × 104 90.0 7.13 1.60 × 104 100 7.92 1.78 × 104 200 15.8 3.55 × 104 226 17.9 4.02 × 104
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 100 ft (lbf/ft) (in) (psi) 40.0 4.83 8770 50.0 6.04 1.10 × 104 60.0 7.24 1.32 × 104 70.0 8.45 1.54 × 104 80.0 9.66 1.75 × 104 90.0 10.9 1.97 × 104 100 12.1 2.19 × 104 148 17.9 3.25 × 104
 Steel I Beam: W18 × 40 (Wide Flange 18 inch tall × 40 lbf/ft) L = 125 ft (lbf/ft) (in) (psi) 40.0 11.8 1.37 × 104 50.0 14.7 1.71 × 104 60.0 17.7 2.06 × 104 60.7 17.9 2.08 × 104