S Section Steel I Beam: S8 × 18.4

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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Four Equal Spans » S Section Steel I Beam » S8 × 18.4
S Section Steel I Beam | Single Span | Two Equal Spans | Three Equal Spans | Four Equal Spans

For a simply supported beam in four equal spans, we compute the displacement at the middle of the first and fourth spans, and the maximum normal stress occuring at the second and fourth supports of the beam.
The tabulated data listed in this page are calculated based on the area moment of inertia (Ixx = 57.6 in4) for the S8 × 18.4 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: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 3.00 ft (lbf/ft) (in) (psi) 18.4 9.25 × 10-6 14.8 20.0 1.01 × 10-5 16.1 30.0 1.51 × 10-5 24.1 40.0 2.01 × 10-5 32.1 50.0 2.51 × 10-5 40.2 60.0 3.02 × 10-5 48.2 70.0 3.52 × 10-5 56.2 80.0 4.02 × 10-5 64.3 90.0 4.52 × 10-5 72.3 100 5.03 × 10-5 80.3 200 1.01 × 10-4 161 300 1.51 × 10-4 241 400 2.01 × 10-4 321 500 2.51 × 10-4 402 600 3.02 × 10-4 482 700 3.52 × 10-4 562 800 4.02 × 10-4 643 900 4.52 × 10-4 723 1000 5.03 × 10-4 803 2000 0.00101 1610 3000 0.00151 2410 4000 0.00201 3210 5000 0.00251 4020 6000 0.00302 4820 7000 0.00352 5620 8000 0.00402 6430 9000 0.00452 7230 1.00 × 104 0.00503 8030 2.00 × 104 0.0101 1.61 × 104 3.00 × 104 0.0151 2.41 × 104 4.00 × 104 0.0201 3.21 × 104 5.00 × 104 0.0251 4.02 × 104 6.00 × 104 0.0302 4.82 × 104 7.00 × 104 0.0352 5.62 × 104 8.00 × 104 0.0402 6.43 × 104 9.00 × 104 0.0452 7.23 × 104 1.00 × 105 0.0503 8.03 × 104 2.00 × 105 0.101 1.61 × 105 3.00 × 105 0.151 2.41 × 105 3.70 × 105 0.186 2.97 × 105
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 5.00 ft (lbf/ft) (in) (psi) 18.4 7.14 × 10-5 41.1 20.0 7.76 × 10-5 44.6 30.0 1.16 × 10-4 66.9 40.0 1.55 × 10-4 89.3 50.0 1.94 × 10-4 112 60.0 2.33 × 10-4 134 70.0 2.71 × 10-4 156 80.0 3.10 × 10-4 179 90.0 3.49 × 10-4 201 100 3.88 × 10-4 223 200 7.76 × 10-4 446 300 0.00116 669 400 0.00155 893 500 0.00194 1120 600 0.00233 1340 700 0.00271 1560 800 0.00310 1790 900 0.00349 2010 1000 0.00388 2230 2000 0.00776 4460 3000 0.0116 6690 4000 0.0155 8920 5000 0.0194 1.12 × 104 6000 0.0233 1.34 × 104 7000 0.0271 1.56 × 104 8000 0.0310 1.78 × 104 9000 0.0349 2.01 × 104 1.00 × 104 0.0388 2.23 × 104 2.00 × 104 0.0776 4.46 × 104 3.00 × 104 0.116 6.69 × 104 4.00 × 104 0.155 8.93 × 104 5.00 × 104 0.194 1.12 × 105 6.00 × 104 0.233 1.34 × 105 7.00 × 104 0.271 1.56 × 105 8.00 × 104 0.310 1.79 × 105 9.00 × 104 0.349 2.01 × 105 1.00 × 105 0.388 2.23 × 105 1.33 × 105 0.516 2.97 × 105
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 10.0 ft (lbf/ft) (in) (psi) 18.4 0.00114 164 20.0 0.00124 179 30.0 0.00186 268 40.0 0.00248 357 50.0 0.00310 446 60.0 0.00372 536 70.0 0.00434 625 80.0 0.00496 714 90.0 0.00558 803 100 0.00621 893 200 0.0124 1790 300 0.0186 2680 400 0.0248 3570 500 0.0310 4460 600 0.0372 5360 700 0.0434 6250 800 0.0496 7140 900 0.0558 8030 1000 0.0621 8920 2000 0.124 1.78 × 104 3000 0.186 2.68 × 104 4000 0.248 3.57 × 104 5000 0.310 4.46 × 104 6000 0.372 5.36 × 104 7000 0.434 6.25 × 104 8000 0.496 7.14 × 104 9000 0.558 8.03 × 104 1.00 × 104 0.621 8.93 × 104 2.00 × 104 1.24 1.79 × 105 3.00 × 104 1.86 2.68 × 105 3.33 × 104 2.07 2.97 × 105
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 15.0 ft (lbf/ft) (in) (psi) 18.4 0.00578 369 20.0 0.00628 402 30.0 0.00942 602 40.0 0.0126 803 50.0 0.0157 1000 60.0 0.0188 1200 70.0 0.0220 1410 80.0 0.0251 1610 90.0 0.0283 1810 100 0.0314 2010 200 0.0628 4020 300 0.0942 6020 400 0.126 8030 500 0.157 1.00 × 104 600 0.188 1.20 × 104 700 0.220 1.41 × 104 800 0.251 1.61 × 104 900 0.283 1.81 × 104 1000 0.314 2.01 × 104 2000 0.628 4.02 × 104 3000 0.942 6.02 × 104 4000 1.26 8.03 × 104 5000 1.57 1.00 × 105 6000 1.88 1.20 × 105 7000 2.20 1.41 × 105 8000 2.51 1.61 × 105 9000 2.83 1.81 × 105 1.00 × 104 3.14 2.01 × 105 1.48 × 104 4.65 2.97 × 105
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 20.0 ft (lbf/ft) (in) (psi) 18.4 0.0183 657 20.0 0.0199 714 30.0 0.0298 1070 40.0 0.0397 1430 50.0 0.0496 1790 60.0 0.0596 2140 70.0 0.0695 2500 80.0 0.0794 2860 90.0 0.0894 3210 100 0.0993 3570 200 0.199 7140 300 0.298 1.07 × 104 400 0.397 1.43 × 104 500 0.496 1.78 × 104 600 0.596 2.14 × 104 700 0.695 2.50 × 104 800 0.794 2.86 × 104 900 0.894 3.21 × 104 1000 0.993 3.57 × 104 2000 1.99 7.14 × 104 3000 2.98 1.07 × 105 4000 3.97 1.43 × 105 5000 4.96 1.79 × 105 6000 5.96 2.14 × 105 7000 6.95 2.50 × 105 8000 7.94 2.86 × 105 8320 8.26 2.97 × 105
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 25.0 ft (lbf/ft) (in) (psi) 18.4 0.0446 1030 20.0 0.0485 1120 30.0 0.0727 1670 40.0 0.0970 2230 50.0 0.121 2790 60.0 0.145 3350 70.0 0.170 3900 80.0 0.194 4460 90.0 0.218 5020 100 0.242 5580 200 0.485 1.12 × 104 300 0.727 1.67 × 104 400 0.970 2.23 × 104 500 1.21 2.79 × 104 600 1.45 3.35 × 104 700 1.70 3.90 × 104 800 1.94 4.46 × 104 900 2.18 5.02 × 104 1000 2.42 5.58 × 104 2000 4.85 1.12 × 105 3000 7.27 1.67 × 105 3300 8.00 1.84 × 105
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 30.0 ft (lbf/ft) (in) (psi) 18.4 0.0925 1480 20.0 0.101 1610 30.0 0.151 2410 40.0 0.201 3210 50.0 0.251 4020 60.0 0.302 4820 70.0 0.352 5620 80.0 0.402 6430 90.0 0.452 7230 100 0.503 8030 200 1.01 1.61 × 104 300 1.51 2.41 × 104 400 2.01 3.21 × 104 500 2.51 4.02 × 104 600 3.02 4.82 × 104 700 3.52 5.62 × 104 800 4.02 6.43 × 104 900 4.52 7.23 × 104 1000 5.03 8.03 × 104 1590 8.00 1.28 × 105
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 40.0 ft (lbf/ft) (in) (psi) 18.4 0.292 2630 20.0 0.318 2860 30.0 0.477 4280 40.0 0.635 5710 50.0 0.794 7140 60.0 0.953 8570 70.0 1.11 10000 80.0 1.27 1.14 × 104 90.0 1.43 1.29 × 104 100 1.59 1.43 × 104 200 3.18 2.86 × 104 300 4.77 4.28 × 104 400 6.35 5.71 × 104 500 7.94 7.14 × 104 504 8.00 7.19 × 104
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 50.0 ft (lbf/ft) (in) (psi) 18.4 0.714 4110 20.0 0.776 4460 30.0 1.16 6690 40.0 1.55 8930 50.0 1.94 1.12 × 104 60.0 2.33 1.34 × 104 70.0 2.71 1.56 × 104 80.0 3.10 1.79 × 104 90.0 3.49 2.01 × 104 100 3.88 2.23 × 104 200 7.76 4.46 × 104 206 8.00 4.60 × 104
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 60.0 ft (lbf/ft) (in) (psi) 18.4 1.48 5910 20.0 1.61 6430 30.0 2.41 9640 40.0 3.22 1.29 × 104 50.0 4.02 1.61 × 104 60.0 4.83 1.93 × 104 70.0 5.63 2.25 × 104 80.0 6.43 2.57 × 104 90.0 7.24 2.89 × 104 99.5 8.00 3.20 × 104
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 70.0 ft (lbf/ft) (in) (psi) 18.4 2.74 8050 20.0 2.98 8750 30.0 4.47 1.31 × 104 40.0 5.96 1.75 × 104 50.0 7.45 2.19 × 104 53.7 8.00 2.35 × 104
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 80.0 ft (lbf/ft) (in) (psi) 18.4 4.68 1.05 × 104 20.0 5.08 1.14 × 104 30.0 7.63 1.71 × 104 31.5 8.00 1.80 × 104
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 90.0 ft (lbf/ft) (in) (psi) 18.4 7.49 1.33 × 104 19.6 8.00 1.42 × 104