engineering fundamentals
S Section Steel I Beam: S15 × 42.9
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » S Section Steel I Beam » S15 × 42.9
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 = 447 in4) for the S15 × 42.9 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
   
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 5.74 × 10-6 9.72
50.0 6.69 × 10-6 11.3
60.0 8.03 × 10-6 13.6
70.0 9.37 × 10-6 15.9
80.0 1.07 × 10-5 18.1
90.0 1.20 × 10-5 20.4
100 1.34 × 10-5 22.7
200 2.68 × 10-5 45.3
300 4.02 × 10-5 68.0
400 5.35 × 10-5 90.6
500 6.69 × 10-5 113
600 8.03 × 10-5 136
700 9.37 × 10-5 159
800 1.07 × 10-4 181
900 1.20 × 10-4 204
1000 1.34 × 10-4 227
2000 2.68 × 10-4 453
3000 4.02 × 10-4 680
4000 5.35 × 10-4 906
5000 6.69 × 10-4 1130
6000 8.03 × 10-4 1360
7000 9.37 × 10-4 1590
8000 0.00107 1810
9000 0.00120 2040
1.00 × 104 0.00134 2270
2.00 × 104 0.00268 4530
3.00 × 104 0.00402 6800
4.00 × 104 0.00535 9060
5.00 × 104 0.00669 1.13 × 104
6.00 × 104 0.00803 1.36 × 104
7.00 × 104 0.00937 1.59 × 104
8.00 × 104 0.0107 1.81 × 104
9.00 × 104 0.0120 2.04 × 104
1.00 × 105 0.0134 2.27 × 104
2.00 × 105 0.0268 4.53 × 104
3.00 × 105 0.0402 6.80 × 104
4.00 × 105 0.0535 9.06 × 104
5.00 × 105 0.0669 1.13 × 105
6.00 × 105 0.0803 1.36 × 105
7.00 × 105 0.0937 1.59 × 105
8.00 × 105 0.107 1.81 × 105
9.00 × 105 0.120 2.04 × 105
1.00 × 106 0.134 2.27 × 105
1.31 × 106 0.176 2.97 × 105
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 4.43 × 10-5 27.0
50.0 5.16 × 10-5 31.5
60.0 6.20 × 10-5 37.8
70.0 7.23 × 10-5 44.0
80.0 8.26 × 10-5 50.3
90.0 9.30 × 10-5 56.6
100 1.03 × 10-4 62.9
200 2.07 × 10-4 126
300 3.10 × 10-4 189
400 4.13 × 10-4 252
500 5.16 × 10-4 315
600 6.20 × 10-4 378
700 7.23 × 10-4 440
800 8.26 × 10-4 503
900 9.30 × 10-4 566
1000 0.00103 629
2000 0.00207 1260
3000 0.00310 1890
4000 0.00413 2520
5000 0.00516 3150
6000 0.00620 3780
7000 0.00723 4400
8000 0.00826 5030
9000 0.00930 5660
1.00 × 104 0.0103 6290
2.00 × 104 0.0207 1.26 × 104
3.00 × 104 0.0310 1.89 × 104
4.00 × 104 0.0413 2.52 × 104
5.00 × 104 0.0516 3.15 × 104
6.00 × 104 0.0620 3.78 × 104
7.00 × 104 0.0723 4.40 × 104
8.00 × 104 0.0826 5.03 × 104
9.00 × 104 0.0930 5.66 × 104
1.00 × 105 0.103 6.29 × 104
2.00 × 105 0.207 1.26 × 105
3.00 × 105 0.310 1.89 × 105
4.00 × 105 0.413 2.52 × 105
4.72 × 105 0.488 2.97 × 105
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 7.09 × 10-4 108
50.0 8.26 × 10-4 126
60.0 9.92 × 10-4 151
70.0 0.00116 176
80.0 0.00132 201
90.0 0.00149 227
100 0.00165 252
200 0.00331 503
300 0.00496 755
400 0.00661 1010
500 0.00826 1260
600 0.00992 1510
700 0.0116 1760
800 0.0132 2010
900 0.0149 2270
1000 0.0165 2520
2000 0.0331 5030
3000 0.0496 7550
4000 0.0661 1.01 × 104
5000 0.0826 1.26 × 104
6000 0.0992 1.51 × 104
7000 0.116 1.76 × 104
8000 0.132 2.01 × 104
9000 0.149 2.27 × 104
1.00 × 104 0.165 2.52 × 104
2.00 × 104 0.331 5.03 × 104
3.00 × 104 0.496 7.55 × 104
4.00 × 104 0.661 1.01 × 105
5.00 × 104 0.826 1.26 × 105
6.00 × 104 0.992 1.51 × 105
7.00 × 104 1.16 1.76 × 105
8.00 × 104 1.32 2.01 × 105
9.00 × 104 1.49 2.27 × 105
1.00 × 105 1.65 2.52 × 105
1.18 × 105 1.95 2.97 × 105
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.00359 243
50.0 0.00418 283
60.0 0.00502 340
70.0 0.00586 396
80.0 0.00669 453
90.0 0.00753 510
100 0.00837 566
200 0.0167 1130
300 0.0251 1700
400 0.0335 2270
500 0.0418 2830
600 0.0502 3400
700 0.0586 3960
800 0.0669 4530
900 0.0753 5100
1000 0.0837 5660
2000 0.167 1.13 × 104
3000 0.251 1.70 × 104
4000 0.335 2.27 × 104
5000 0.418 2.83 × 104
6000 0.502 3.40 × 104
7000 0.586 3.96 × 104
8000 0.669 4.53 × 104
9000 0.753 5.10 × 104
1.00 × 104 0.837 5.66 × 104
2.00 × 104 1.67 1.13 × 105
3.00 × 104 2.51 1.70 × 105
4.00 × 104 3.35 2.27 × 105
5.00 × 104 4.18 2.83 × 105
5.25 × 104 4.39 2.97 × 105
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.0113 432
50.0 0.0132 503
60.0 0.0159 604
70.0 0.0185 705
80.0 0.0212 805
90.0 0.0238 906
100 0.0264 1010
200 0.0529 2010
300 0.0793 3020
400 0.106 4030
500 0.132 5030
600 0.159 6040
700 0.185 7050
800 0.212 8050
900 0.238 9060
1000 0.264 1.01 × 104
2000 0.529 2.01 × 104
3000 0.793 3.02 × 104
4000 1.06 4.03 × 104
5000 1.32 5.03 × 104
6000 1.59 6.04 × 104
7000 1.85 7.05 × 104
8000 2.12 8.05 × 104
9000 2.38 9.06 × 104
1.00 × 104 2.64 1.01 × 105
2.00 × 104 5.29 2.01 × 105
2.95 × 104 7.80 2.97 × 105
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.0277 675
50.0 0.0323 786
60.0 0.0387 944
70.0 0.0452 1100
80.0 0.0516 1260
90.0 0.0581 1420
100 0.0646 1570
200 0.129 3150
300 0.194 4720
400 0.258 6290
500 0.323 7860
600 0.387 9440
700 0.452 1.10 × 104
800 0.516 1.26 × 104
900 0.581 1.42 × 104
1000 0.646 1.57 × 104
2000 1.29 3.15 × 104
3000 1.94 4.72 × 104
4000 2.58 6.29 × 104
5000 3.23 7.86 × 104
6000 3.87 9.44 × 104
7000 4.52 1.10 × 105
8000 5.16 1.26 × 105
9000 5.81 1.42 × 105
1.00 × 104 6.46 1.57 × 105
1.89 × 104 12.2 2.97 × 105
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.0574 972
50.0 0.0669 1130
60.0 0.0803 1360
70.0 0.0937 1590
80.0 0.107 1810
90.0 0.120 2040
100 0.134 2270
200 0.268 4530
300 0.402 6800
400 0.535 9060
500 0.669 1.13 × 104
600 0.803 1.36 × 104
700 0.937 1.59 × 104
800 1.07 1.81 × 104
900 1.20 2.04 × 104
1000 1.34 2.27 × 104
2000 2.68 4.53 × 104
3000 4.02 6.80 × 104
4000 5.35 9.06 × 104
5000 6.69 1.13 × 105
6000 8.03 1.36 × 105
7000 9.37 1.59 × 105
8000 10.7 1.81 × 105
9000 12.0 2.04 × 105
1.00 × 104 13.4 2.27 × 105
1.31 × 104 17.6 2.97 × 105
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.181 1730
50.0 0.212 2010
60.0 0.254 2420
70.0 0.296 2820
80.0 0.338 3220
90.0 0.381 3620
100 0.423 4030
200 0.846 8050
300 1.27 1.21 × 104
400 1.69 1.61 × 104
500 2.12 2.01 × 104
600 2.54 2.42 × 104
700 2.96 2.82 × 104
800 3.38 3.22 × 104
900 3.81 3.62 × 104
1000 4.23 4.03 × 104
2000 8.46 8.05 × 104
3000 12.7 1.21 × 105
3550 15.0 1.43 × 105
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.443 2700
50.0 0.516 3150
60.0 0.620 3780
70.0 0.723 4400
80.0 0.826 5030
90.0 0.930 5660
100 1.03 6290
200 2.07 1.26 × 104
300 3.10 1.89 × 104
400 4.13 2.52 × 104
500 5.16 3.15 × 104
600 6.20 3.78 × 104
700 7.23 4.40 × 104
800 8.26 5.03 × 104
900 9.30 5.66 × 104
1000 10.3 6.29 × 104
1450 15.0 9.14 × 104
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.919 3890
50.0 1.07 4530
60.0 1.29 5440
70.0 1.50 6340
80.0 1.71 7250
90.0 1.93 8150
100 2.14 9060
200 4.28 1.81 × 104
300 6.43 2.72 × 104
400 8.57 3.62 × 104
500 10.7 4.53 × 104
600 12.9 5.44 × 104
700 15.0 6.34 × 104
700 15.0 6.35 × 104
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 1.70 5290
50.0 1.98 6170
60.0 2.38 7400
70.0 2.78 8630
80.0 3.17 9870
90.0 3.57 1.11 × 104
100 3.97 1.23 × 104
200 7.94 2.47 × 104
300 11.9 3.70 × 104
378 15.0 4.66 × 104
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 2.90 6910
50.0 3.38 8050
60.0 4.06 9660
70.0 4.74 1.13 × 104
80.0 5.42 1.29 × 104
90.0 6.09 1.45 × 104
100 6.77 1.61 × 104
200 13.5 3.22 × 104
222 15.0 3.57 × 104
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 4.65 8750
50.0 5.42 1.02 × 104
60.0 6.51 1.22 × 104
70.0 7.59 1.43 × 104
80.0 8.67 1.63 × 104
90.0 9.76 1.83 × 104
100 10.8 2.04 × 104
138 15.0 2.82 × 104
Steel I Beam: S15 × 42.9 (S Section 15 inch tall × 42.9 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 7.09 1.08 × 104
50.0 8.26 1.26 × 104
60.0 9.92 1.51 × 104
70.0 11.6 1.76 × 104
80.0 13.2 2.01 × 104
90.0 14.9 2.27 × 104
90.8 15.0 2.28 × 104
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