Wide Flange Steel I Beam: W8 × 18

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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two Equal Spans » Wide Flange Steel I Beam » W8 × 18
Wide Flange 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 = 61.9 in4) for the W8 × 18 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: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 3.00 ft (lbf/ft) (in) (psi) 18.0 6.96 × 10-6 16.0 20.0 7.73 × 10-6 17.8 30.0 1.16 × 10-5 26.6 40.0 1.55 × 10-5 35.5 50.0 1.93 × 10-5 44.4 60.0 2.32 × 10-5 53.3 70.0 2.71 × 10-5 62.1 80.0 3.09 × 10-5 71.0 90.0 3.48 × 10-5 79.9 100 3.87 × 10-5 88.8 200 7.73 × 10-5 178 300 1.16 × 10-4 266 400 1.55 × 10-4 355 500 1.93 × 10-4 444 600 2.32 × 10-4 533 700 2.71 × 10-4 621 800 3.09 × 10-4 710 900 3.48 × 10-4 799 1000 3.87 × 10-4 888 2000 7.73 × 10-4 1780 3000 0.00116 2660 4000 0.00155 3550 5000 0.00193 4440 6000 0.00232 5330 7000 0.00271 6210 8000 0.00309 7100 9000 0.00348 7990 1.00 × 104 0.00387 8880 2.00 × 104 0.00773 1.78 × 104 3.00 × 104 0.0116 2.66 × 104 4.00 × 104 0.0155 3.55 × 104 5.00 × 104 0.0193 4.44 × 104 6.00 × 104 0.0232 5.33 × 104 7.00 × 104 0.0271 6.21 × 104 8.00 × 104 0.0309 7.10 × 104 9.00 × 104 0.0348 7.99 × 104 1.00 × 105 0.0387 8.88 × 104 2.00 × 105 0.0773 1.78 × 105 3.00 × 105 0.116 2.66 × 105 3.35 × 105 0.129 2.97 × 105
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 5.00 ft (lbf/ft) (in) (psi) 18.0 5.37 × 10-5 44.4 20.0 5.97 × 10-5 49.3 30.0 8.95 × 10-5 74.0 40.0 1.19 × 10-4 98.6 50.0 1.49 × 10-4 123 60.0 1.79 × 10-4 148 70.0 2.09 × 10-4 173 80.0 2.39 × 10-4 197 90.0 2.69 × 10-4 222 100 2.98 × 10-4 247 200 5.97 × 10-4 493 300 8.95 × 10-4 740 400 0.00119 986 500 0.00149 1230 600 0.00179 1480 700 0.00209 1730 800 0.00239 1970 900 0.00269 2220 1000 0.00298 2470 2000 0.00597 4930 3000 0.00895 7400 4000 0.0119 9860 5000 0.0149 1.23 × 104 6000 0.0179 1.48 × 104 7000 0.0209 1.73 × 104 8000 0.0239 1.97 × 104 9000 0.0269 2.22 × 104 1.00 × 104 0.0298 2.47 × 104 2.00 × 104 0.0597 4.93 × 104 3.00 × 104 0.0895 7.40 × 104 4.00 × 104 0.119 9.86 × 104 5.00 × 104 0.149 1.23 × 105 6.00 × 104 0.179 1.48 × 105 7.00 × 104 0.209 1.73 × 105 8.00 × 104 0.239 1.97 × 105 9.00 × 104 0.269 2.22 × 105 1.00 × 105 0.298 2.47 × 105 1.20 × 105 0.359 2.97 × 105
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 10.0 ft (lbf/ft) (in) (psi) 18.0 8.59 × 10-4 178 20.0 9.55 × 10-4 197 30.0 0.00143 296 40.0 0.00191 395 50.0 0.00239 493 60.0 0.00286 592 70.0 0.00334 690 80.0 0.00382 789 90.0 0.00430 888 100 0.00477 986 200 0.00955 1970 300 0.0143 2960 400 0.0191 3950 500 0.0239 4930 600 0.0286 5920 700 0.0334 6900 800 0.0382 7890 900 0.0430 8880 1000 0.0477 9860 2000 0.0955 1.97 × 104 3000 0.143 2.96 × 104 4000 0.191 3.95 × 104 5000 0.239 4.93 × 104 6000 0.286 5.92 × 104 7000 0.334 6.90 × 104 8000 0.382 7.89 × 104 9000 0.430 8.88 × 104 1.00 × 104 0.477 9.86 × 104 2.00 × 104 0.955 1.97 × 105 3.00 × 104 1.43 2.96 × 105 3.01 × 104 1.44 2.97 × 105
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 15.0 ft (lbf/ft) (in) (psi) 18.0 0.00435 399 20.0 0.00483 444 30.0 0.00725 666 40.0 0.00967 888 50.0 0.0121 1110 60.0 0.0145 1330 70.0 0.0169 1550 80.0 0.0193 1780 90.0 0.0217 2000 100 0.0242 2220 200 0.0483 4440 300 0.0725 6660 400 0.0967 8880 500 0.121 1.11 × 104 600 0.145 1.33 × 104 700 0.169 1.55 × 104 800 0.193 1.78 × 104 900 0.217 2.00 × 104 1000 0.242 2.22 × 104 2000 0.483 4.44 × 104 3000 0.725 6.66 × 104 4000 0.967 8.88 × 104 5000 1.21 1.11 × 105 6000 1.45 1.33 × 105 7000 1.69 1.55 × 105 8000 1.93 1.78 × 105 9000 2.17 2.00 × 105 1.00 × 104 2.42 2.22 × 105 1.34 × 104 3.23 2.97 × 105
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 20.0 ft (lbf/ft) (in) (psi) 18.0 0.0137 710 20.0 0.0153 789 30.0 0.0229 1180 40.0 0.0306 1580 50.0 0.0382 1970 60.0 0.0458 2370 70.0 0.0535 2760 80.0 0.0611 3160 90.0 0.0687 3550 100 0.0764 3950 200 0.153 7890 300 0.229 1.18 × 104 400 0.306 1.58 × 104 500 0.382 1.97 × 104 600 0.458 2.37 × 104 700 0.535 2.76 × 104 800 0.611 3.16 × 104 900 0.687 3.55 × 104 1000 0.764 3.95 × 104 2000 1.53 7.89 × 104 3000 2.29 1.18 × 105 4000 3.06 1.58 × 105 5000 3.82 1.97 × 105 6000 4.58 2.37 × 105 7000 5.35 2.76 × 105 7530 5.75 2.97 × 105
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 25.0 ft (lbf/ft) (in) (psi) 18.0 0.0336 1110 20.0 0.0373 1230 30.0 0.0559 1850 40.0 0.0746 2470 50.0 0.0932 3080 60.0 0.112 3700 70.0 0.131 4310 80.0 0.149 4930 90.0 0.168 5550 100 0.186 6160 200 0.373 1.23 × 104 300 0.559 1.85 × 104 400 0.746 2.47 × 104 500 0.932 3.08 × 104 600 1.12 3.70 × 104 700 1.31 4.31 × 104 800 1.49 4.93 × 104 900 1.68 5.55 × 104 1000 1.86 6.16 × 104 2000 3.73 1.23 × 105 3000 5.59 1.85 × 105 4000 7.46 2.47 × 105 4820 8.99 2.97 × 105
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 30.0 ft (lbf/ft) (in) (psi) 18.0 0.0696 1600 20.0 0.0773 1780 30.0 0.116 2660 40.0 0.155 3550 50.0 0.193 4440 60.0 0.232 5330 70.0 0.271 6210 80.0 0.309 7100 90.0 0.348 7990 100 0.387 8880 200 0.773 1.78 × 104 300 1.16 2.66 × 104 400 1.55 3.55 × 104 500 1.93 4.44 × 104 600 2.32 5.33 × 104 700 2.71 6.21 × 104 800 3.09 7.10 × 104 900 3.48 7.99 × 104 1000 3.87 8.88 × 104 2000 7.73 1.78 × 105 2110 8.14 1.87 × 105
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 40.0 ft (lbf/ft) (in) (psi) 18.0 0.220 2840 20.0 0.244 3160 30.0 0.367 4730 40.0 0.489 6310 50.0 0.611 7890 60.0 0.733 9470 70.0 0.855 1.10 × 104 80.0 0.978 1.26 × 104 90.0 1.10 1.42 × 104 100 1.22 1.58 × 104 200 2.44 3.16 × 104 300 3.67 4.73 × 104 400 4.89 6.31 × 104 500 6.11 7.89 × 104 600 7.33 9.47 × 104 666 8.14 1.05 × 105
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 50.0 ft (lbf/ft) (in) (psi) 18.0 0.537 4440 20.0 0.597 4930 30.0 0.895 7400 40.0 1.19 9860 50.0 1.49 1.23 × 104 60.0 1.79 1.48 × 104 70.0 2.09 1.73 × 104 80.0 2.39 1.97 × 104 90.0 2.69 2.22 × 104 100 2.98 2.47 × 104 200 5.97 4.93 × 104 273 8.14 6.73 × 104
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 60.0 ft (lbf/ft) (in) (psi) 18.0 1.11 6390 20.0 1.24 7100 30.0 1.86 1.07 × 104 40.0 2.47 1.42 × 104 50.0 3.09 1.78 × 104 60.0 3.71 2.13 × 104 70.0 4.33 2.49 × 104 80.0 4.95 2.84 × 104 90.0 5.57 3.20 × 104 100 6.19 3.55 × 104 132 8.14 4.67 × 104
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 70.0 ft (lbf/ft) (in) (psi) 18.0 2.06 8700 20.0 2.29 9670 30.0 3.44 1.45 × 104 40.0 4.58 1.93 × 104 50.0 5.73 2.42 × 104 60.0 6.88 2.90 × 104 70.0 8.02 3.38 × 104 71.0 8.14 3.43 × 104
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 80.0 ft (lbf/ft) (in) (psi) 18.0 3.52 1.14 × 104 20.0 3.91 1.26 × 104 30.0 5.87 1.89 × 104 40.0 7.82 2.52 × 104 41.6 8.14 2.63 × 104
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 90.0 ft (lbf/ft) (in) (psi) 18.0 5.64 1.44 × 104 20.0 6.26 1.60 × 104 26.0 8.14 2.08 × 104