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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » 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 a single span, the maximum displacement w_max and the maximum normal stress stress_max occur at the center 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
   
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 4.07 × 10-6 8.27
60.0 4.47 × 10-6 9.07
70.0 5.21 × 10-6 10.6
80.0 5.95 × 10-6 12.1
90.0 6.70 × 10-6 13.6
100 7.44 × 10-6 15.1
200 1.49 × 10-5 30.2
300 2.23 × 10-5 45.3
400 2.98 × 10-5 60.4
500 3.72 × 10-5 75.6
600 4.47 × 10-5 90.7
700 5.21 × 10-5 106
800 5.95 × 10-5 121
900 6.70 × 10-5 136
1000 7.44 × 10-5 151
2000 1.49 × 10-4 302
3000 2.23 × 10-4 453
4000 2.98 × 10-4 604
5000 3.72 × 10-4 756
6000 4.47 × 10-4 907
7000 5.21 × 10-4 1060
8000 5.95 × 10-4 1210
9000 6.70 × 10-4 1360
1.00 × 104 7.44 × 10-4 1510
2.00 × 104 0.00149 3020
3.00 × 104 0.00223 4530
4.00 × 104 0.00298 6040
5.00 × 104 0.00372 7560
6.00 × 104 0.00447 9070
7.00 × 104 0.00521 1.06 × 104
8.00 × 104 0.00595 1.21 × 104
9.00 × 104 0.00670 1.36 × 104
1.00 × 105 0.00744 1.51 × 104
2.00 × 105 0.0149 3.02 × 104
3.00 × 105 0.0223 4.53 × 104
4.00 × 105 0.0298 6.04 × 104
5.00 × 105 0.0372 7.56 × 104
6.00 × 105 0.0447 9.07 × 104
7.00 × 105 0.0521 1.06 × 105
8.00 × 105 0.0595 1.21 × 105
9.00 × 105 0.0670 1.36 × 105
1.00 × 106 0.0744 1.51 × 105
1.97 × 106 0.146 2.97 × 105
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 3.14 × 10-5 23.0
60.0 3.45 × 10-5 25.2
70.0 4.02 × 10-5 29.4
80.0 4.59 × 10-5 33.6
90.0 5.17 × 10-5 37.8
100 5.74 × 10-5 42.0
200 1.15 × 10-4 84.0
300 1.72 × 10-4 126
400 2.30 × 10-4 168
500 2.87 × 10-4 210
600 3.45 × 10-4 252
700 4.02 × 10-4 294
800 4.59 × 10-4 336
900 5.17 × 10-4 378
1000 5.74 × 10-4 420
2000 0.00115 840
3000 0.00172 1260
4000 0.00230 1680
5000 0.00287 2100
6000 0.00345 2520
7000 0.00402 2940
8000 0.00459 3360
9000 0.00517 3780
1.00 × 104 0.00574 4200
2.00 × 104 0.0115 8400
3.00 × 104 0.0172 1.26 × 104
4.00 × 104 0.0230 1.68 × 104
5.00 × 104 0.0287 2.10 × 104
6.00 × 104 0.0345 2.52 × 104
7.00 × 104 0.0402 2.94 × 104
8.00 × 104 0.0459 3.36 × 104
9.00 × 104 0.0517 3.78 × 104
1.00 × 105 0.0574 4.20 × 104
2.00 × 105 0.115 8.40 × 104
3.00 × 105 0.172 1.26 × 105
4.00 × 105 0.230 1.68 × 105
5.00 × 105 0.287 2.10 × 105
6.00 × 105 0.345 2.52 × 105
7.00 × 105 0.402 2.94 × 105
7.08 × 105 0.406 2.97 × 105
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 5.03 × 10-4 91.8
60.0 5.51 × 10-4 101
70.0 6.43 × 10-4 118
80.0 7.35 × 10-4 134
90.0 8.27 × 10-4 151
100 9.19 × 10-4 168
200 0.00184 336
300 0.00276 504
400 0.00368 672
500 0.00459 840
600 0.00551 1010
700 0.00643 1180
800 0.00735 1340
900 0.00827 1510
1000 0.00919 1680
2000 0.0184 3360
3000 0.0276 5040
4000 0.0368 6720
5000 0.0459 8400
6000 0.0551 1.01 × 104
7000 0.0643 1.18 × 104
8000 0.0735 1.34 × 104
9000 0.0827 1.51 × 104
1.00 × 104 0.0919 1.68 × 104
2.00 × 104 0.184 3.36 × 104
3.00 × 104 0.276 5.04 × 104
4.00 × 104 0.368 6.72 × 104
5.00 × 104 0.459 8.40 × 104
6.00 × 104 0.551 1.01 × 105
7.00 × 104 0.643 1.18 × 105
8.00 × 104 0.735 1.34 × 105
9.00 × 104 0.827 1.51 × 105
1.00 × 105 0.919 1.68 × 105
1.77 × 105 1.63 2.97 × 105
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.00254 207
60.0 0.00279 227
70.0 0.00326 264
80.0 0.00372 302
90.0 0.00419 340
100 0.00465 378
200 0.00930 756
300 0.0140 1130
400 0.0186 1510
500 0.0233 1890
600 0.0279 2270
700 0.0326 2640
800 0.0372 3020
900 0.0419 3400
1000 0.0465 3780
2000 0.0930 7560
3000 0.140 1.13 × 104
4000 0.186 1.51 × 104
5000 0.233 1.89 × 104
6000 0.279 2.27 × 104
7000 0.326 2.64 × 104
8000 0.372 3.02 × 104
9000 0.419 3.40 × 104
1.00 × 104 0.465 3.78 × 104
2.00 × 104 0.930 7.56 × 104
3.00 × 104 1.40 1.13 × 105
4.00 × 104 1.86 1.51 × 105
5.00 × 104 2.33 1.89 × 105
6.00 × 104 2.79 2.27 × 105
7.00 × 104 3.26 2.64 × 105
7.86 × 104 3.66 2.97 × 105
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.00804 367
60.0 0.00882 403
70.0 0.0103 470
80.0 0.0118 537
90.0 0.0132 604
100 0.0147 672
200 0.0294 1340
300 0.0441 2010
400 0.0588 2690
500 0.0735 3360
600 0.0882 4030
700 0.103 4700
800 0.118 5370
900 0.132 6040
1000 0.147 6720
2000 0.294 1.34 × 104
3000 0.441 2.01 × 104
4000 0.588 2.69 × 104
5000 0.735 3.36 × 104
6000 0.882 4.03 × 104
7000 1.03 4.70 × 104
8000 1.18 5.37 × 104
9000 1.32 6.04 × 104
1.00 × 104 1.47 6.72 × 104
2.00 × 104 2.94 1.34 × 105
3.00 × 104 4.41 2.01 × 105
4.00 × 104 5.88 2.69 × 105
4.42 × 104 6.50 2.97 × 105
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.0196 574
60.0 0.0215 630
70.0 0.0251 735
80.0 0.0287 840
90.0 0.0323 944
100 0.0359 1050
200 0.0718 2100
300 0.108 3150
400 0.144 4200
500 0.179 5250
600 0.215 6300
700 0.251 7350
800 0.287 8400
900 0.323 9440
1000 0.359 1.05 × 104
2000 0.718 2.10 × 104
3000 1.08 3.15 × 104
4000 1.44 4.20 × 104
5000 1.79 5.25 × 104
6000 2.15 6.30 × 104
7000 2.51 7.35 × 104
8000 2.87 8.40 × 104
9000 3.23 9.44 × 104
1.00 × 104 3.59 1.05 × 105
2.00 × 104 7.18 2.10 × 105
2.83 × 104 10.2 2.97 × 105
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.0407 827
60.0 0.0447 907
70.0 0.0521 1060
80.0 0.0595 1210
90.0 0.0670 1360
100 0.0744 1510
200 0.149 3020
300 0.223 4530
400 0.298 6040
500 0.372 7560
600 0.447 9070
700 0.521 1.06 × 104
800 0.595 1.21 × 104
900 0.670 1.36 × 104
1000 0.744 1.51 × 104
2000 1.49 3.02 × 104
3000 2.23 4.53 × 104
4000 2.98 6.04 × 104
5000 3.72 7.56 × 104
6000 4.47 9.07 × 104
7000 5.21 1.06 × 105
8000 5.95 1.21 × 105
9000 6.70 1.36 × 105
1.00 × 104 7.44 1.51 × 105
1.97 × 104 14.6 2.97 × 105
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.129 1470
60.0 0.141 1610
70.0 0.165 1880
80.0 0.188 2150
90.0 0.212 2420
100 0.235 2690
200 0.470 5370
300 0.706 8060
400 0.941 1.07 × 104
500 1.18 1.34 × 104
600 1.41 1.61 × 104
700 1.65 1.88 × 104
800 1.88 2.15 × 104
900 2.12 2.42 × 104
1000 2.35 2.69 × 104
2000 4.70 5.37 × 104
3000 7.06 8.06 × 104
4000 9.41 1.07 × 105
5000 11.8 1.34 × 105
6000 14.1 1.61 × 105
7000 16.5 1.88 × 105
7650 18.0 2.06 × 105
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.314 2300
60.0 0.345 2520
70.0 0.402 2940
80.0 0.459 3360
90.0 0.517 3780
100 0.574 4200
200 1.15 8400
300 1.72 1.26 × 104
400 2.30 1.68 × 104
500 2.87 2.10 × 104
600 3.45 2.52 × 104
700 4.02 2.94 × 104
800 4.59 3.36 × 104
900 5.17 3.78 × 104
1000 5.74 4.20 × 104
2000 11.5 8.40 × 104
3000 17.2 1.26 × 105
3130 18.0 1.32 × 105
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 0.651 3310
60.0 0.714 3630
70.0 0.834 4230
80.0 0.953 4840
90.0 1.07 5440
100 1.19 6040
200 2.38 1.21 × 104
300 3.57 1.81 × 104
400 4.76 2.42 × 104
500 5.95 3.02 × 104
600 7.14 3.63 × 104
700 8.34 4.23 × 104
800 9.53 4.84 × 104
900 10.7 5.44 × 104
1000 11.9 6.04 × 104
1510 18.0 9.14 × 104
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 1.21 4500
60.0 1.32 4940
70.0 1.54 5760
80.0 1.76 6580
90.0 1.99 7400
100 2.21 8230
200 4.41 1.65 × 104
300 6.62 2.47 × 104
400 8.82 3.29 × 104
500 11.0 4.11 × 104
600 13.2 4.94 × 104
700 15.4 5.76 × 104
800 17.6 6.58 × 104
816 18.0 6.71 × 104
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 2.06 5880
60.0 2.26 6450
70.0 2.63 7520
80.0 3.01 8600
90.0 3.39 9670
100 3.76 1.07 × 104
200 7.53 2.15 × 104
300 11.3 3.22 × 104
400 15.1 4.30 × 104
478 18.0 5.14 × 104
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 3.30 7440
60.0 3.62 8160
70.0 4.22 9520
80.0 4.82 1.09 × 104
90.0 5.43 1.22 × 104
100 6.03 1.36 × 104
200 12.1 2.72 × 104
299 18.0 4.06 × 104
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 5.03 9180
60.0 5.51 1.01 × 104
70.0 6.43 1.18 × 104
80.0 7.35 1.34 × 104
90.0 8.27 1.51 × 104
100 9.19 1.68 × 104
196 18.0 3.29 × 104
Steel I Beam: S18 × 54.7 (S Section 18 inch tall × 54.7 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
54.7 12.3 1.44 × 104
60.0 13.5 1.57 × 104
70.0 15.7 1.84 × 104
80.0 17.9 2.10 × 104
80.2 18.0 2.11 × 104
Additional Information
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FREE Publications
Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

more publications