Wide Flange Steel I Beam: W8 × 18

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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » Wide Flange Steel I Beam » W8 × 18

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 = 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 1.74 × 10-5 16.0 20.0 1.93 × 10-5 17.8 30.0 2.90 × 10-5 26.6 40.0 3.87 × 10-5 35.5 50.0 4.83 × 10-5 44.4 60.0 5.80 × 10-5 53.3 70.0 6.77 × 10-5 62.1 80.0 7.73 × 10-5 71.0 90.0 8.70 × 10-5 79.9 100 9.67 × 10-5 88.8 200 1.93 × 10-4 178 300 2.90 × 10-4 266 400 3.87 × 10-4 355 500 4.83 × 10-4 444 600 5.80 × 10-4 533 700 6.77 × 10-4 621 800 7.73 × 10-4 710 900 8.70 × 10-4 799 1000 9.67 × 10-4 888 2000 0.00193 1780 3000 0.00290 2660 4000 0.00387 3550 5000 0.00483 4440 6000 0.00580 5330 7000 0.00677 6210 8000 0.00773 7100 9000 0.00870 7990 1.00 × 104 0.00967 8880 2.00 × 104 0.0193 1.78 × 104 3.00 × 104 0.0290 2.66 × 104 4.00 × 104 0.0387 3.55 × 104 5.00 × 104 0.0483 4.44 × 104 6.00 × 104 0.0580 5.33 × 104 7.00 × 104 0.0677 6.21 × 104 8.00 × 104 0.0773 7.10 × 104 9.00 × 104 0.0870 7.99 × 104 1.00 × 105 0.0967 8.88 × 104 2.00 × 105 0.193 1.78 × 105 3.00 × 105 0.290 2.66 × 105 3.35 × 105 0.323 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 1.34 × 10-4 44.4 20.0 1.49 × 10-4 49.3 30.0 2.24 × 10-4 74.0 40.0 2.98 × 10-4 98.6 50.0 3.73 × 10-4 123 60.0 4.48 × 10-4 148 70.0 5.22 × 10-4 173 80.0 5.97 × 10-4 197 90.0 6.71 × 10-4 222 100 7.46 × 10-4 247 200 0.00149 493 300 0.00224 740 400 0.00298 986 500 0.00373 1230 600 0.00448 1480 700 0.00522 1730 800 0.00597 1970 900 0.00671 2220 1000 0.00746 2470 2000 0.0149 4930 3000 0.0224 7400 4000 0.0298 9860 5000 0.0373 1.23 × 104 6000 0.0448 1.48 × 104 7000 0.0522 1.73 × 104 8000 0.0597 1.97 × 104 9000 0.0671 2.22 × 104 1.00 × 104 0.0746 2.47 × 104 2.00 × 104 0.149 4.93 × 104 3.00 × 104 0.224 7.40 × 104 4.00 × 104 0.298 9.86 × 104 5.00 × 104 0.373 1.23 × 105 6.00 × 104 0.448 1.48 × 105 7.00 × 104 0.522 1.73 × 105 8.00 × 104 0.597 1.97 × 105 9.00 × 104 0.671 2.22 × 105 1.00 × 105 0.746 2.47 × 105 1.20 × 105 0.899 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 0.00215 178 20.0 0.00239 197 30.0 0.00358 296 40.0 0.00477 395 50.0 0.00597 493 60.0 0.00716 592 70.0 0.00835 690 80.0 0.00955 789 90.0 0.0107 888 100 0.0119 986 200 0.0239 1970 300 0.0358 2960 400 0.0477 3950 500 0.0597 4930 600 0.0716 5920 700 0.0835 6900 800 0.0955 7890 900 0.107 8880 1000 0.119 9860 2000 0.239 1.97 × 104 3000 0.358 2.96 × 104 4000 0.477 3.95 × 104 5000 0.597 4.93 × 104 6000 0.716 5.92 × 104 7000 0.835 6.90 × 104 8000 0.955 7.89 × 104 9000 1.07 8.88 × 104 1.00 × 104 1.19 9.86 × 104 2.00 × 104 2.39 1.97 × 105 3.00 × 104 3.58 2.96 × 105 3.01 × 104 3.59 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 0.0109 399 20.0 0.0121 444 30.0 0.0181 666 40.0 0.0242 888 50.0 0.0302 1110 60.0 0.0362 1330 70.0 0.0423 1550 80.0 0.0483 1780 90.0 0.0544 2000 100 0.0604 2220 200 0.121 4440 300 0.181 6660 400 0.242 8880 500 0.302 1.11 × 104 600 0.362 1.33 × 104 700 0.423 1.55 × 104 800 0.483 1.78 × 104 900 0.544 2.00 × 104 1000 0.604 2.22 × 104 2000 1.21 4.44 × 104 3000 1.81 6.66 × 104 4000 2.42 8.88 × 104 5000 3.02 1.11 × 105 6000 3.62 1.33 × 105 7000 4.23 1.55 × 105 8000 4.83 1.78 × 105 9000 5.44 2.00 × 105 1.00 × 104 6.04 2.22 × 105 1.34 × 104 8.09 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 0.0344 710 20.0 0.0382 789 30.0 0.0573 1180 40.0 0.0764 1580 50.0 0.0955 1970 60.0 0.115 2370 70.0 0.134 2760 80.0 0.153 3160 90.0 0.172 3550 100 0.191 3950 200 0.382 7890 300 0.573 1.18 × 104 400 0.764 1.58 × 104 500 0.955 1.97 × 104 600 1.15 2.37 × 104 700 1.34 2.76 × 104 800 1.53 3.16 × 104 900 1.72 3.55 × 104 1000 1.91 3.95 × 104 2000 3.82 7.89 × 104 3000 5.73 1.18 × 105 4000 7.64 1.58 × 105 4260 8.14 1.68 × 105
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 25.0 ft (lbf/ft) (in) (psi) 18.0 0.0839 1110 20.0 0.0932 1230 30.0 0.140 1850 40.0 0.186 2470 50.0 0.233 3080 60.0 0.280 3700 70.0 0.326 4310 80.0 0.373 4930 90.0 0.420 5550 100 0.466 6160 200 0.932 1.23 × 104 300 1.40 1.85 × 104 400 1.86 2.47 × 104 500 2.33 3.08 × 104 600 2.80 3.70 × 104 700 3.26 4.31 × 104 800 3.73 4.93 × 104 900 4.20 5.55 × 104 1000 4.66 6.16 × 104 1750 8.14 1.08 × 105
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 30.0 ft (lbf/ft) (in) (psi) 18.0 0.174 1600 20.0 0.193 1780 30.0 0.290 2660 40.0 0.387 3550 50.0 0.483 4440 60.0 0.580 5330 70.0 0.677 6210 80.0 0.773 7100 90.0 0.870 7990 100 0.967 8880 200 1.93 1.78 × 104 300 2.90 2.66 × 104 400 3.87 3.55 × 104 500 4.83 4.44 × 104 600 5.80 5.33 × 104 700 6.77 6.21 × 104 800 7.73 7.10 × 104 842 8.14 7.47 × 104
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 40.0 ft (lbf/ft) (in) (psi) 18.0 0.550 2840 20.0 0.611 3160 30.0 0.917 4730 40.0 1.22 6310 50.0 1.53 7890 60.0 1.83 9470 70.0 2.14 1.10 × 104 80.0 2.44 1.26 × 104 90.0 2.75 1.42 × 104 100 3.06 1.58 × 104 200 6.11 3.16 × 104 266 8.14 4.20 × 104
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 50.0 ft (lbf/ft) (in) (psi) 18.0 1.34 4440 20.0 1.49 4930 30.0 2.24 7400 40.0 2.98 9860 50.0 3.73 1.23 × 104 60.0 4.48 1.48 × 104 70.0 5.22 1.73 × 104 80.0 5.97 1.97 × 104 90.0 6.71 2.22 × 104 100 7.46 2.47 × 104 109 8.14 2.69 × 104
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 60.0 ft (lbf/ft) (in) (psi) 18.0 2.78 6390 20.0 3.09 7100 30.0 4.64 1.07 × 104 40.0 6.19 1.42 × 104 50.0 7.73 1.78 × 104 52.6 8.14 1.87 × 104
 Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft) L = 70.0 ft (lbf/ft) (in) (psi) 18.0 5.16 8700 20.0 5.73 9670 28.4 8.14 1.37 × 104