S Section Steel I Beam: S8 × 18.4

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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two 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 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 = 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 7.65 × 10-6 17.2 20.0 8.31 × 10-6 18.8 30.0 1.25 × 10-5 28.1 40.0 1.66 × 10-5 37.5 50.0 2.08 × 10-5 46.9 60.0 2.49 × 10-5 56.3 70.0 2.91 × 10-5 65.6 80.0 3.32 × 10-5 75.0 90.0 3.74 × 10-5 84.4 100 4.16 × 10-5 93.8 200 8.31 × 10-5 188 300 1.25 × 10-4 281 400 1.66 × 10-4 375 500 2.08 × 10-4 469 600 2.49 × 10-4 563 700 2.91 × 10-4 656 800 3.32 × 10-4 750 900 3.74 × 10-4 844 1000 4.16 × 10-4 938 2000 8.31 × 10-4 1880 3000 0.00125 2810 4000 0.00166 3750 5000 0.00208 4690 6000 0.00249 5630 7000 0.00291 6560 8000 0.00332 7500 9000 0.00374 8440 1.00 × 104 0.00416 9380 2.00 × 104 0.00831 1.88 × 104 3.00 × 104 0.0125 2.81 × 104 4.00 × 104 0.0166 3.75 × 104 5.00 × 104 0.0208 4.69 × 104 6.00 × 104 0.0249 5.63 × 104 7.00 × 104 0.0291 6.56 × 104 8.00 × 104 0.0332 7.50 × 104 9.00 × 104 0.0374 8.44 × 104 1.00 × 105 0.0416 9.38 × 104 2.00 × 105 0.0831 1.88 × 105 3.00 × 105 0.125 2.81 × 105 3.17 × 105 0.132 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 5.90 × 10-5 47.9 20.0 6.41 × 10-5 52.1 30.0 9.62 × 10-5 78.1 40.0 1.28 × 10-4 104 50.0 1.60 × 10-4 130 60.0 1.92 × 10-4 156 70.0 2.24 × 10-4 182 80.0 2.57 × 10-4 208 90.0 2.89 × 10-4 234 100 3.21 × 10-4 260 200 6.41 × 10-4 521 300 9.62 × 10-4 781 400 0.00128 1040 500 0.00160 1300 600 0.00192 1560 700 0.00224 1820 800 0.00257 2080 900 0.00289 2340 1000 0.00321 2600 2000 0.00641 5210 3000 0.00962 7810 4000 0.0128 1.04 × 104 5000 0.0160 1.30 × 104 6000 0.0192 1.56 × 104 7000 0.0224 1.82 × 104 8000 0.0257 2.08 × 104 9000 0.0289 2.34 × 104 1.00 × 104 0.0321 2.60 × 104 2.00 × 104 0.0641 5.21 × 104 3.00 × 104 0.0962 7.81 × 104 4.00 × 104 0.128 1.04 × 105 5.00 × 104 0.160 1.30 × 105 6.00 × 104 0.192 1.56 × 105 7.00 × 104 0.224 1.82 × 105 8.00 × 104 0.257 2.08 × 105 9.00 × 104 0.289 2.34 × 105 1.00 × 105 0.321 2.60 × 105 1.14 × 105 0.366 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 9.44 × 10-4 192 20.0 0.00103 208 30.0 0.00154 313 40.0 0.00205 417 50.0 0.00257 521 60.0 0.00308 625 70.0 0.00359 729 80.0 0.00410 833 90.0 0.00462 938 100 0.00513 1040 200 0.0103 2080 300 0.0154 3130 400 0.0205 4170 500 0.0257 5210 600 0.0308 6250 700 0.0359 7290 800 0.0410 8330 900 0.0462 9380 1000 0.0513 1.04 × 104 2000 0.103 2.08 × 104 3000 0.154 3.13 × 104 4000 0.205 4.17 × 104 5000 0.257 5.21 × 104 6000 0.308 6.25 × 104 7000 0.359 7.29 × 104 8000 0.410 8.33 × 104 9000 0.462 9.38 × 104 1.00 × 104 0.513 1.04 × 105 2.00 × 104 1.03 2.08 × 105 2.85 × 104 1.46 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 0.00478 431 20.0 0.00519 469 30.0 0.00779 703 40.0 0.0104 938 50.0 0.0130 1170 60.0 0.0156 1410 70.0 0.0182 1640 80.0 0.0208 1880 90.0 0.0234 2110 100 0.0260 2340 200 0.0519 4690 300 0.0779 7030 400 0.104 9380 500 0.130 1.17 × 104 600 0.156 1.41 × 104 700 0.182 1.64 × 104 800 0.208 1.88 × 104 900 0.234 2.11 × 104 1000 0.260 2.34 × 104 2000 0.519 4.69 × 104 3000 0.779 7.03 × 104 4000 1.04 9.38 × 104 5000 1.30 1.17 × 105 6000 1.56 1.41 × 105 7000 1.82 1.64 × 105 8000 2.08 1.88 × 105 9000 2.34 2.11 × 105 1.00 × 104 2.60 2.34 × 105 1.27 × 104 3.29 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 0.0151 767 20.0 0.0164 833 30.0 0.0246 1250 40.0 0.0328 1670 50.0 0.0410 2080 60.0 0.0492 2500 70.0 0.0575 2920 80.0 0.0657 3330 90.0 0.0739 3750 100 0.0821 4170 200 0.164 8330 300 0.246 1.25 × 104 400 0.328 1.67 × 104 500 0.410 2.08 × 104 600 0.492 2.50 × 104 700 0.575 2.92 × 104 800 0.657 3.33 × 104 900 0.739 3.75 × 104 1000 0.821 4.17 × 104 2000 1.64 8.33 × 104 3000 2.46 1.25 × 105 4000 3.28 1.67 × 105 5000 4.10 2.08 × 105 6000 4.92 2.50 × 105 7000 5.75 2.92 × 105 7130 5.85 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 0.0369 1200 20.0 0.0401 1300 30.0 0.0601 1950 40.0 0.0802 2600 50.0 0.100 3260 60.0 0.120 3910 70.0 0.140 4560 80.0 0.160 5210 90.0 0.180 5860 100 0.200 6510 200 0.401 1.30 × 104 300 0.601 1.95 × 104 400 0.802 2.60 × 104 500 1.00 3.26 × 104 600 1.20 3.91 × 104 700 1.40 4.56 × 104 800 1.60 5.21 × 104 900 1.80 5.86 × 104 1000 2.00 6.51 × 104 2000 4.01 1.30 × 105 3000 6.01 1.95 × 105 3990 8.00 2.60 × 105
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 30.0 ft (lbf/ft) (in) (psi) 18.4 0.0765 1720 20.0 0.0831 1880 30.0 0.125 2810 40.0 0.166 3750 50.0 0.208 4690 60.0 0.249 5630 70.0 0.291 6560 80.0 0.332 7500 90.0 0.374 8440 100 0.416 9380 200 0.831 1.88 × 104 300 1.25 2.81 × 104 400 1.66 3.75 × 104 500 2.08 4.69 × 104 600 2.49 5.63 × 104 700 2.91 6.56 × 104 800 3.32 7.50 × 104 900 3.74 8.44 × 104 1000 4.16 9.38 × 104 1930 8.00 1.80 × 105
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 40.0 ft (lbf/ft) (in) (psi) 18.4 0.242 3070 20.0 0.263 3330 30.0 0.394 5000 40.0 0.525 6670 50.0 0.657 8330 60.0 0.788 1.00 × 104 70.0 0.919 1.17 × 104 80.0 1.05 1.33 × 104 90.0 1.18 1.50 × 104 100 1.31 1.67 × 104 200 2.63 3.33 × 104 300 3.94 5.00 × 104 400 5.25 6.67 × 104 500 6.57 8.33 × 104 600 7.88 1.00 × 105 609 8.00 1.02 × 105
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 50.0 ft (lbf/ft) (in) (psi) 18.4 0.590 4790 20.0 0.641 5210 30.0 0.962 7810 40.0 1.28 1.04 × 104 50.0 1.60 1.30 × 104 60.0 1.92 1.56 × 104 70.0 2.24 1.82 × 104 80.0 2.57 2.08 × 104 90.0 2.89 2.34 × 104 100 3.21 2.60 × 104 200 6.41 5.21 × 104 250 8.00 6.50 × 104
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 60.0 ft (lbf/ft) (in) (psi) 18.4 1.22 6900 20.0 1.33 7500 30.0 1.99 1.13 × 104 40.0 2.66 1.50 × 104 50.0 3.32 1.88 × 104 60.0 3.99 2.25 × 104 70.0 4.65 2.63 × 104 80.0 5.32 3.00 × 104 90.0 5.98 3.38 × 104 100 6.65 3.75 × 104 120 8.00 4.51 × 104
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 70.0 ft (lbf/ft) (in) (psi) 18.4 2.27 9390 20.0 2.46 1.02 × 104 30.0 3.70 1.53 × 104 40.0 4.93 2.04 × 104 50.0 6.16 2.55 × 104 60.0 7.39 3.06 × 104 64.9 8.00 3.32 × 104
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 80.0 ft (lbf/ft) (in) (psi) 18.4 3.87 1.23 × 104 20.0 4.20 1.33 × 104 30.0 6.30 2.00 × 104 38.1 8.00 2.54 × 104
 Steel I Beam: S8 × 18.4 (S8 inch tall × 18.4 lbf/ft) L = 90.0 ft (lbf/ft) (in) (psi) 18.4 6.19 1.55 × 104 20.0 6.73 1.69 × 104 23.8 8.00 2.01 × 104