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S Section Steel I Beam: S18 × 54.7
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Three Equal Spans » S Section Steel I Beam » S18 × 54.7
S Section Steel I Beam | Single Span | Two Equal Spans | Three Equal Spans | Four Equal Spans

For a simply supported beam in three equal spans, we compute the displacement at the middle of the first and the third spans, and the maximum normal stress stress_max occuring at the second and third supports of the beam.
The tabulated data listed in this page are calculated based on the area moment of inertia (Ixx = 804 in4) for the S18 × 54.7 S Section Steel I Beam and the typical Young's modulus (E = 3.046 × 107 psi) of steels. Note that the typical yielding stress Yield 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.
L = 3 ft
L = 5 ft
L = 10 ft
L = 15 ft
L = 20 ft
L = 25 ft
L = 30 ft
L = 40 ft
L = 50 ft
L = 60 ft
L = 70 ft
L = 80 ft
L = 90 ft
L = 100 ft
L = 125 ft
L = 150 ft
   
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 2.13 × 10-6 6.61
60.0 2.33 × 10-6 7.25
70.0 2.72 × 10-6 8.46
80.0 3.11 × 10-6 9.67
90.0 3.50 × 10-6 10.9
100 3.89 × 10-6 12.1
200 7.77 × 10-6 24.2
300 1.17 × 10-5 36.3
400 1.55 × 10-5 48.4
500 1.94 × 10-5 60.4
600 2.33 × 10-5 72.5
700 2.72 × 10-5 84.6
800 3.11 × 10-5 96.7
900 3.50 × 10-5 109
1000 3.89 × 10-5 121
2000 7.77 × 10-5 242
3000 1.17 × 10-4 363
4000 1.55 × 10-4 484
5000 1.94 × 10-4 604
6000 2.33 × 10-4 725
7000 2.72 × 10-4 846
8000 3.11 × 10-4 967
9000 3.50 × 10-4 1090
1.00 × 104 3.89 × 10-4 1210
2.00 × 104 7.77 × 10-4 2420
3.00 × 104 0.00117 3630
4.00 × 104 0.00155 4840
5.00 × 104 0.00194 6040
6.00 × 104 0.00233 7250
7.00 × 104 0.00272 8460
8.00 × 104 0.00311 9670
9.00 × 104 0.00350 1.09 × 104
1.00 × 105 0.00389 1.21 × 104
2.00 × 105 0.00777 2.42 × 104
3.00 × 105 0.0117 3.63 × 104
4.00 × 105 0.0155 4.84 × 104
5.00 × 105 0.0194 6.04 × 104
6.00 × 105 0.0233 7.25 × 104
7.00 × 105 0.0272 8.46 × 104
8.00 × 105 0.0311 9.67 × 104
9.00 × 105 0.0350 1.09 × 105
1.00 × 106 0.0389 1.21 × 105
2.00 × 106 0.0777 2.42 × 105
2.46 × 106 0.0955 2.97 × 105
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 1.64 × 10-5 18.4
60.0 1.80 × 10-5 20.1
70.0 2.10 × 10-5 23.5
80.0 2.40 × 10-5 26.9
90.0 2.70 × 10-5 30.2
100 3.00 × 10-5 33.6
200 6.00 × 10-5 67.2
300 9.00 × 10-5 101
400 1.20 × 10-4 134
500 1.50 × 10-4 168
600 1.80 × 10-4 201
700 2.10 × 10-4 235
800 2.40 × 10-4 269
900 2.70 × 10-4 302
1000 3.00 × 10-4 336
2000 6.00 × 10-4 672
3000 9.00 × 10-4 1010
4000 0.00120 1340
5000 0.00150 1680
6000 0.00180 2010
7000 0.00210 2350
8000 0.00240 2690
9000 0.00270 3020
1.00 × 104 0.00300 3360
2.00 × 104 0.00600 6720
3.00 × 104 0.00900 1.01 × 104
4.00 × 104 0.0120 1.34 × 104
5.00 × 104 0.0150 1.68 × 104
6.00 × 104 0.0180 2.01 × 104
7.00 × 104 0.0210 2.35 × 104
8.00 × 104 0.0240 2.69 × 104
9.00 × 104 0.0270 3.02 × 104
1.00 × 105 0.0300 3.36 × 104
2.00 × 105 0.0600 6.72 × 104
3.00 × 105 0.0900 1.01 × 105
4.00 × 105 0.120 1.34 × 105
5.00 × 105 0.150 1.68 × 105
6.00 × 105 0.180 2.01 × 105
7.00 × 105 0.210 2.35 × 105
8.00 × 105 0.240 2.69 × 105
8.85 × 105 0.265 2.97 × 105
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 2.62 × 10-4 73.5
60.0 2.88 × 10-4 80.6
70.0 3.36 × 10-4 94.0
80.0 3.84 × 10-4 107
90.0 4.32 × 10-4 121
100 4.80 × 10-4 134
200 9.60 × 10-4 269
300 0.00144 403
400 0.00192 537
500 0.00240 672
600 0.00288 806
700 0.00336 940
800 0.00384 1070
900 0.00432 1210
1000 0.00480 1340
2000 0.00960 2690
3000 0.0144 4030
4000 0.0192 5370
5000 0.0240 6720
6000 0.0288 8060
7000 0.0336 9400
8000 0.0384 1.07 × 104
9000 0.0432 1.21 × 104
1.00 × 104 0.0480 1.34 × 104
2.00 × 104 0.0960 2.69 × 104
3.00 × 104 0.144 4.03 × 104
4.00 × 104 0.192 5.37 × 104
5.00 × 104 0.240 6.72 × 104
6.00 × 104 0.288 8.06 × 104
7.00 × 104 0.336 9.40 × 104
8.00 × 104 0.384 1.07 × 105
9.00 × 104 0.432 1.21 × 105
1.00 × 105 0.480 1.34 × 105
2.00 × 105 0.960 2.69 × 105
2.21 × 105 1.06 2.97 × 105
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.00133 165
60.0 0.00146 181
70.0 0.00170 212
80.0 0.00194 242
90.0 0.00219 272
100 0.00243 302
200 0.00486 604
300 0.00729 907
400 0.00972 1210
500 0.0121 1510
600 0.0146 1810
700 0.0170 2120
800 0.0194 2420
900 0.0219 2720
1000 0.0243 3020
2000 0.0486 6040
3000 0.0729 9070
4000 0.0972 1.21 × 104
5000 0.121 1.51 × 104
6000 0.146 1.81 × 104
7000 0.170 2.12 × 104
8000 0.194 2.42 × 104
9000 0.219 2.72 × 104
1.00 × 104 0.243 3.02 × 104
2.00 × 104 0.486 6.04 × 104
3.00 × 104 0.729 9.07 × 104
4.00 × 104 0.972 1.21 × 105
5.00 × 104 1.21 1.51 × 105
6.00 × 104 1.46 1.81 × 105
7.00 × 104 1.70 2.12 × 105
8.00 × 104 1.94 2.42 × 105
9.00 × 104 2.19 2.72 × 105
9.83 × 104 2.39 2.97 × 105
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.00420 294
60.0 0.00461 322
70.0 0.00537 376
80.0 0.00614 430
90.0 0.00691 484
100 0.00768 537
200 0.0154 1070
300 0.0230 1610
400 0.0307 2150
500 0.0384 2690
600 0.0461 3220
700 0.0537 3760
800 0.0614 4300
900 0.0691 4840
1000 0.0768 5370
2000 0.154 1.07 × 104
3000 0.230 1.61 × 104
4000 0.307 2.15 × 104
5000 0.384 2.69 × 104
6000 0.461 3.22 × 104
7000 0.537 3.76 × 104
8000 0.614 4.30 × 104
9000 0.691 4.84 × 104
1.00 × 104 0.768 5.37 × 104
2.00 × 104 1.54 1.07 × 105
3.00 × 104 2.30 1.61 × 105
4.00 × 104 3.07 2.15 × 105
5.00 × 104 3.84 2.69 × 105
5.53 × 104 4.24 2.97 × 105
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.0103 459
60.0 0.0112 504
70.0 0.0131 588
80.0 0.0150 672
90.0 0.0169 756
100 0.0187 840
200 0.0375 1680
300 0.0562 2520
400 0.0750 3360
500 0.0937 4200
600 0.112 5040
700 0.131 5880
800 0.150 6720
900 0.169 7560
1000 0.187 8400
2000 0.375 1.68 × 104
3000 0.562 2.52 × 104
4000 0.750 3.36 × 104
5000 0.937 4.20 × 104
6000 1.12 5.04 × 104
7000 1.31 5.88 × 104
8000 1.50 6.72 × 104
9000 1.69 7.56 × 104
1.00 × 104 1.87 8.40 × 104
2.00 × 104 3.75 1.68 × 105
3.00 × 104 5.62 2.52 × 105
3.54 × 104 6.63 2.97 × 105
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.0213 661
60.0 0.0233 725
70.0 0.0272 846
80.0 0.0311 967
90.0 0.0350 1090
100 0.0389 1210
200 0.0777 2420
300 0.117 3630
400 0.155 4840
500 0.194 6040
600 0.233 7250
700 0.272 8460
800 0.311 9670
900 0.350 1.09 × 104
1000 0.389 1.21 × 104
2000 0.777 2.42 × 104
3000 1.17 3.63 × 104
4000 1.55 4.84 × 104
5000 1.94 6.04 × 104
6000 2.33 7.25 × 104
7000 2.72 8.46 × 104
8000 3.11 9.67 × 104
9000 3.50 1.09 × 105
1.00 × 104 3.89 1.21 × 105
2.00 × 104 7.77 2.42 × 105
2.46 × 104 9.55 2.97 × 105
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.0672 1180
60.0 0.0737 1290
70.0 0.0860 1500
80.0 0.0983 1720
90.0 0.111 1930
100 0.123 2150
200 0.246 4300
300 0.369 6450
400 0.491 8600
500 0.614 1.07 × 104
600 0.737 1.29 × 104
700 0.860 1.50 × 104
800 0.983 1.72 × 104
900 1.11 1.93 × 104
1000 1.23 2.15 × 104
2000 2.46 4.30 × 104
3000 3.69 6.45 × 104
4000 4.91 8.60 × 104
5000 6.14 1.07 × 105
6000 7.37 1.29 × 105
7000 8.60 1.50 × 105
8000 9.83 1.72 × 105
9000 11.1 1.93 × 105
1.00 × 104 12.3 2.15 × 105
1.38 × 104 17.0 2.97 × 105
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.164 1840
60.0 0.180 2010
70.0 0.210 2350
80.0 0.240 2690
90.0 0.270 3020
100 0.300 3360
200 0.600 6720
300 0.900 1.01 × 104
400 1.20 1.34 × 104
500 1.50 1.68 × 104
600 1.80 2.01 × 104
700 2.10 2.35 × 104
800 2.40 2.69 × 104
900 2.70 3.02 × 104
1000 3.00 3.36 × 104
2000 6.00 6.72 × 104
3000 9.00 1.01 × 105
4000 12.0 1.34 × 105
5000 15.0 1.68 × 105
6000 18.0 2.01 × 105
6000 18.0 2.02 × 105
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.340 2650
60.0 0.373 2900
70.0 0.435 3390
80.0 0.497 3870
90.0 0.560 4350
100 0.622 4840
200 1.24 9670
300 1.87 1.45 × 104
400 2.49 1.93 × 104
500 3.11 2.42 × 104
600 3.73 2.90 × 104
700 4.35 3.39 × 104
800 4.97 3.87 × 104
900 5.60 4.35 × 104
1000 6.22 4.84 × 104
2000 12.4 9.67 × 104
2890 18.0 1.40 × 105
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.630 3600
60.0 0.691 3950
70.0 0.806 4610
80.0 0.922 5270
90.0 1.04 5920
100 1.15 6580
200 2.30 1.32 × 104
300 3.46 1.97 × 104
400 4.61 2.63 × 104
500 5.76 3.29 × 104
600 6.91 3.95 × 104
700 8.06 4.61 × 104
800 9.22 5.27 × 104
900 10.4 5.92 × 104
1000 11.5 6.58 × 104
1560 18.0 1.03 × 105
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 1.08 4700
60.0 1.18 5160
70.0 1.38 6020
80.0 1.57 6880
90.0 1.77 7740
100 1.97 8600
200 3.93 1.72 × 104
300 5.90 2.58 × 104
400 7.86 3.44 × 104
500 9.83 4.30 × 104
600 11.8 5.16 × 104
700 13.8 6.02 × 104
800 15.7 6.88 × 104
900 17.7 7.74 × 104
916 18.0 7.87 × 104
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 1.72 5950
60.0 1.89 6530
70.0 2.20 7620
80.0 2.52 8700
90.0 2.83 9790
100 3.15 1.09 × 104
200 6.30 2.18 × 104
300 9.44 3.26 × 104
400 12.6 4.35 × 104
500 15.7 5.44 × 104
572 18.0 6.22 × 104
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 2.62 7350
60.0 2.88 8060
70.0 3.36 9400
80.0 3.84 1.07 × 104
90.0 4.32 1.21 × 104
100 4.80 1.34 × 104
200 9.60 2.69 × 104
300 14.4 4.03 × 104
375 18.0 5.04 × 104
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 6.41 1.15 × 104
60.0 7.03 1.26 × 104
70.0 8.20 1.47 × 104
80.0 9.37 1.68 × 104
90.0 10.5 1.89 × 104
100 11.7 2.10 × 104
154 18.0 3.22 × 104
Steel I Beam: S18 × 54.7 (S18 inch tall × 54.7 lbf/ft)
L = 150 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 13.3 1.65 × 104
60.0 14.6 1.81 × 104
70.0 17.0 2.12 × 104
74.1 18.0 2.24 × 104
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