Wide Flange Steel I Beam: W8 × 21

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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » Wide Flange Steel I Beam » W8 × 21

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 = 75.3 in4) for the W8 × 21 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 × 21 (Wide Flange 8 inch tall × 21 lbf/ft) L = 3.00 ft (lbf/ft) (in) (psi) 21.0 1.67 × 10-5 15.6 30.0 2.38 × 10-5 22.3 40.0 3.18 × 10-5 29.7 50.0 3.97 × 10-5 37.1 60.0 4.77 × 10-5 44.5 70.0 5.56 × 10-5 52.0 80.0 6.36 × 10-5 59.4 90.0 7.15 × 10-5 66.8 100 7.95 × 10-5 74.2 200 1.59 × 10-4 148 300 2.38 × 10-4 223 400 3.18 × 10-4 297 500 3.97 × 10-4 371 600 4.77 × 10-4 445 700 5.56 × 10-4 520 800 6.36 × 10-4 594 900 7.15 × 10-4 668 1000 7.95 × 10-4 742 2000 0.00159 1480 3000 0.00238 2230 4000 0.00318 2970 5000 0.00397 3710 6000 0.00477 4450 7000 0.00556 5200 8000 0.00636 5940 9000 0.00715 6680 1.00 × 104 0.00795 7420 2.00 × 104 0.0159 1.48 × 104 3.00 × 104 0.0238 2.23 × 104 4.00 × 104 0.0318 2.97 × 104 5.00 × 104 0.0397 3.71 × 104 6.00 × 104 0.0477 4.45 × 104 7.00 × 104 0.0556 5.20 × 104 8.00 × 104 0.0636 5.94 × 104 9.00 × 104 0.0715 6.68 × 104 1.00 × 105 0.0795 7.42 × 104 2.00 × 105 0.159 1.48 × 105 3.00 × 105 0.238 2.23 × 105 4.00 × 105 0.318 2.97 × 105 4.00 × 105 0.318 2.97 × 105
 Steel I Beam: W8 × 21 (Wide Flange 8 inch tall × 21 lbf/ft) L = 5.00 ft (lbf/ft) (in) (psi) 21.0 1.29 × 10-4 43.3 30.0 1.84 × 10-4 61.9 40.0 2.45 × 10-4 82.5 50.0 3.07 × 10-4 103 60.0 3.68 × 10-4 124 70.0 4.29 × 10-4 144 80.0 4.91 × 10-4 165 90.0 5.52 × 10-4 186 100 6.13 × 10-4 206 200 0.00123 412 300 0.00184 619 400 0.00245 825 500 0.00307 1030 600 0.00368 1240 700 0.00429 1440 800 0.00491 1650 900 0.00552 1860 1000 0.00613 2060 2000 0.0123 4120 3000 0.0184 6190 4000 0.0245 8250 5000 0.0307 1.03 × 104 6000 0.0368 1.24 × 104 7000 0.0429 1.44 × 104 8000 0.0491 1.65 × 104 9000 0.0552 1.86 × 104 1.00 × 104 0.0613 2.06 × 104 2.00 × 104 0.123 4.12 × 104 3.00 × 104 0.184 6.19 × 104 4.00 × 104 0.245 8.25 × 104 5.00 × 104 0.307 1.03 × 105 6.00 × 104 0.368 1.24 × 105 7.00 × 104 0.429 1.44 × 105 8.00 × 104 0.491 1.65 × 105 9.00 × 104 0.552 1.86 × 105 1.00 × 105 0.613 2.06 × 105 1.44 × 105 0.883 2.97 × 105
 Steel I Beam: W8 × 21 (Wide Flange 8 inch tall × 21 lbf/ft) L = 10.0 ft (lbf/ft) (in) (psi) 21.0 0.00206 173 30.0 0.00294 247 40.0 0.00392 330 50.0 0.00491 412 60.0 0.00589 495 70.0 0.00687 577 80.0 0.00785 660 90.0 0.00883 742 100 0.00981 825 200 0.0196 1650 300 0.0294 2470 400 0.0392 3300 500 0.0491 4120 600 0.0589 4950 700 0.0687 5770 800 0.0785 6600 900 0.0883 7420 1000 0.0981 8250 2000 0.196 1.65 × 104 3000 0.294 2.47 × 104 4000 0.392 3.30 × 104 5000 0.491 4.12 × 104 6000 0.589 4.95 × 104 7000 0.687 5.77 × 104 8000 0.785 6.60 × 104 9000 0.883 7.42 × 104 1.00 × 104 0.981 8.25 × 104 2.00 × 104 1.96 1.65 × 105 3.00 × 104 2.94 2.47 × 105 3.60 × 104 3.53 2.97 × 105
 Steel I Beam: W8 × 21 (Wide Flange 8 inch tall × 21 lbf/ft) L = 15.0 ft (lbf/ft) (in) (psi) 21.0 0.0104 390 30.0 0.0149 557 40.0 0.0199 742 50.0 0.0248 928 60.0 0.0298 1110 70.0 0.0348 1300 80.0 0.0397 1480 90.0 0.0447 1670 100 0.0497 1860 200 0.0993 3710 300 0.149 5570 400 0.199 7420 500 0.248 9280 600 0.298 1.11 × 104 700 0.348 1.30 × 104 800 0.397 1.48 × 104 900 0.447 1.67 × 104 1000 0.497 1.86 × 104 2000 0.993 3.71 × 104 3000 1.49 5.57 × 104 4000 1.99 7.42 × 104 5000 2.48 9.28 × 104 6000 2.98 1.11 × 105 7000 3.48 1.30 × 105 8000 3.97 1.48 × 105 9000 4.47 1.67 × 105 1.00 × 104 4.97 1.86 × 105 1.60 × 104 7.95 2.97 × 105
 Steel I Beam: W8 × 21 (Wide Flange 8 inch tall × 21 lbf/ft) L = 20.0 ft (lbf/ft) (in) (psi) 21.0 0.0330 693 30.0 0.0471 990 40.0 0.0628 1320 50.0 0.0785 1650 60.0 0.0942 1980 70.0 0.110 2310 80.0 0.126 2640 90.0 0.141 2970 100 0.157 3300 200 0.314 6600 300 0.471 9900 400 0.628 1.32 × 104 500 0.785 1.65 × 104 600 0.942 1.98 × 104 700 1.10 2.31 × 104 800 1.26 2.64 × 104 900 1.41 2.97 × 104 1000 1.57 3.30 × 104 2000 3.14 6.60 × 104 3000 4.71 9.90 × 104 4000 6.28 1.32 × 105 5000 7.85 1.65 × 105 5280 8.28 1.74 × 105
 Steel I Beam: W8 × 21 (Wide Flange 8 inch tall × 21 lbf/ft) L = 25.0 ft (lbf/ft) (in) (psi) 21.0 0.0805 1080 30.0 0.115 1550 40.0 0.153 2060 50.0 0.192 2580 60.0 0.230 3090 70.0 0.268 3610 80.0 0.307 4120 90.0 0.345 4640 100 0.383 5150 200 0.766 1.03 × 104 300 1.15 1.55 × 104 400 1.53 2.06 × 104 500 1.92 2.58 × 104 600 2.30 3.09 × 104 700 2.68 3.61 × 104 800 3.07 4.12 × 104 900 3.45 4.64 × 104 1000 3.83 5.15 × 104 2000 7.66 1.03 × 105 2160 8.28 1.11 × 105
 Steel I Beam: W8 × 21 (Wide Flange 8 inch tall × 21 lbf/ft) L = 30.0 ft (lbf/ft) (in) (psi) 21.0 0.167 1560 30.0 0.238 2230 40.0 0.318 2970 50.0 0.397 3710 60.0 0.477 4450 70.0 0.556 5200 80.0 0.636 5940 90.0 0.715 6680 100 0.795 7420 200 1.59 1.48 × 104 300 2.38 2.23 × 104 400 3.18 2.97 × 104 500 3.97 3.71 × 104 600 4.77 4.45 × 104 700 5.56 5.20 × 104 800 6.36 5.94 × 104 900 7.15 6.68 × 104 1000 7.95 7.42 × 104 1040 8.28 7.73 × 104
 Steel I Beam: W8 × 21 (Wide Flange 8 inch tall × 21 lbf/ft) L = 40.0 ft (lbf/ft) (in) (psi) 21.0 0.527 2770 30.0 0.753 3960 40.0 1.00 5280 50.0 1.26 6600 60.0 1.51 7920 70.0 1.76 9240 80.0 2.01 1.06 × 104 90.0 2.26 1.19 × 104 100 2.51 1.32 × 104 200 5.02 2.64 × 104 300 7.53 3.96 × 104 330 8.28 4.35 × 104
 Steel I Beam: W8 × 21 (Wide Flange 8 inch tall × 21 lbf/ft) L = 50.0 ft (lbf/ft) (in) (psi) 21.0 1.29 4330 30.0 1.84 6190 40.0 2.45 8250 50.0 3.07 1.03 × 104 60.0 3.68 1.24 × 104 70.0 4.29 1.44 × 104 80.0 4.91 1.65 × 104 90.0 5.52 1.86 × 104 100 6.13 2.06 × 104 135 8.28 2.78 × 104
 Steel I Beam: W8 × 21 (Wide Flange 8 inch tall × 21 lbf/ft) L = 60.0 ft (lbf/ft) (in) (psi) 21.0 2.67 6230 30.0 3.81 8910 40.0 5.09 1.19 × 104 50.0 6.36 1.48 × 104 60.0 7.63 1.78 × 104 65.1 8.28 1.93 × 104
 Steel I Beam: W8 × 21 (Wide Flange 8 inch tall × 21 lbf/ft) L = 70.0 ft (lbf/ft) (in) (psi) 21.0 4.95 8490 30.0 7.07 1.21 × 104 35.2 8.28 1.42 × 104