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S Section Steel I Beam: S15 × 42.9
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two Equal Spans » 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 two equal spans, we compute the displacement at the middle of each span w_mid and the maximum normal stress stress_max 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 = 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
L = 125 ft
L = 150 ft
   
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 2.30 × 10-6 9.72
50.0 2.68 × 10-6 11.3
60.0 3.21 × 10-6 13.6
70.0 3.75 × 10-6 15.9
80.0 4.28 × 10-6 18.1
90.0 4.82 × 10-6 20.4
100 5.35 × 10-6 22.7
200 1.07 × 10-5 45.3
300 1.61 × 10-5 68.0
400 2.14 × 10-5 90.6
500 2.68 × 10-5 113
600 3.21 × 10-5 136
700 3.75 × 10-5 159
800 4.28 × 10-5 181
900 4.82 × 10-5 204
1000 5.35 × 10-5 227
2000 1.07 × 10-4 453
3000 1.61 × 10-4 680
4000 2.14 × 10-4 906
5000 2.68 × 10-4 1130
6000 3.21 × 10-4 1360
7000 3.75 × 10-4 1590
8000 4.28 × 10-4 1810
9000 4.82 × 10-4 2040
1.00 × 104 5.35 × 10-4 2270
2.00 × 104 0.00107 4530
3.00 × 104 0.00161 6800
4.00 × 104 0.00214 9060
5.00 × 104 0.00268 1.13 × 104
6.00 × 104 0.00321 1.36 × 104
7.00 × 104 0.00375 1.59 × 104
8.00 × 104 0.00428 1.81 × 104
9.00 × 104 0.00482 2.04 × 104
1.00 × 105 0.00535 2.27 × 104
2.00 × 105 0.0107 4.53 × 104
3.00 × 105 0.0161 6.80 × 104
4.00 × 105 0.0214 9.06 × 104
5.00 × 105 0.0268 1.13 × 105
6.00 × 105 0.0321 1.36 × 105
7.00 × 105 0.0375 1.59 × 105
8.00 × 105 0.0428 1.81 × 105
9.00 × 105 0.0482 2.04 × 105
1.00 × 106 0.0535 2.27 × 105
1.31 × 106 0.0702 2.97 × 105
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 1.77 × 10-5 27.0
50.0 2.07 × 10-5 31.5
60.0 2.48 × 10-5 37.8
70.0 2.89 × 10-5 44.0
80.0 3.31 × 10-5 50.3
90.0 3.72 × 10-5 56.6
100 4.13 × 10-5 62.9
200 8.26 × 10-5 126
300 1.24 × 10-4 189
400 1.65 × 10-4 252
500 2.07 × 10-4 315
600 2.48 × 10-4 378
700 2.89 × 10-4 440
800 3.31 × 10-4 503
900 3.72 × 10-4 566
1000 4.13 × 10-4 629
2000 8.26 × 10-4 1260
3000 0.00124 1890
4000 0.00165 2520
5000 0.00207 3150
6000 0.00248 3780
7000 0.00289 4400
8000 0.00331 5030
9000 0.00372 5660
1.00 × 104 0.00413 6290
2.00 × 104 0.00826 1.26 × 104
3.00 × 104 0.0124 1.89 × 104
4.00 × 104 0.0165 2.52 × 104
5.00 × 104 0.0207 3.15 × 104
6.00 × 104 0.0248 3.78 × 104
7.00 × 104 0.0289 4.40 × 104
8.00 × 104 0.0331 5.03 × 104
9.00 × 104 0.0372 5.66 × 104
1.00 × 105 0.0413 6.29 × 104
2.00 × 105 0.0826 1.26 × 105
3.00 × 105 0.124 1.89 × 105
4.00 × 105 0.165 2.52 × 105
4.72 × 105 0.195 2.97 × 105
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 2.84 × 10-4 108
50.0 3.31 × 10-4 126
60.0 3.97 × 10-4 151
70.0 4.63 × 10-4 176
80.0 5.29 × 10-4 201
90.0 5.95 × 10-4 227
100 6.61 × 10-4 252
200 0.00132 503
300 0.00198 755
400 0.00264 1010
500 0.00331 1260
600 0.00397 1510
700 0.00463 1760
800 0.00529 2010
900 0.00595 2270
1000 0.00661 2520
2000 0.0132 5030
3000 0.0198 7550
4000 0.0264 1.01 × 104
5000 0.0331 1.26 × 104
6000 0.0397 1.51 × 104
7000 0.0463 1.76 × 104
8000 0.0529 2.01 × 104
9000 0.0595 2.27 × 104
1.00 × 104 0.0661 2.52 × 104
2.00 × 104 0.132 5.03 × 104
3.00 × 104 0.198 7.55 × 104
4.00 × 104 0.264 1.01 × 105
5.00 × 104 0.331 1.26 × 105
6.00 × 104 0.397 1.51 × 105
7.00 × 104 0.463 1.76 × 105
8.00 × 104 0.529 2.01 × 105
9.00 × 104 0.595 2.27 × 105
1.00 × 105 0.661 2.52 × 105
1.18 × 105 0.780 2.97 × 105
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.00144 243
50.0 0.00167 283
60.0 0.00201 340
70.0 0.00234 396
80.0 0.00268 453
90.0 0.00301 510
100 0.00335 566
200 0.00669 1130
300 0.0100 1700
400 0.0134 2270
500 0.0167 2830
600 0.0201 3400
700 0.0234 3960
800 0.0268 4530
900 0.0301 5100
1000 0.0335 5660
2000 0.0669 1.13 × 104
3000 0.100 1.70 × 104
4000 0.134 2.27 × 104
5000 0.167 2.83 × 104
6000 0.201 3.40 × 104
7000 0.234 3.96 × 104
8000 0.268 4.53 × 104
9000 0.301 5.10 × 104
1.00 × 104 0.335 5.66 × 104
2.00 × 104 0.669 1.13 × 105
3.00 × 104 1.00 1.70 × 105
4.00 × 104 1.34 2.27 × 105
5.00 × 104 1.67 2.83 × 105
5.25 × 104 1.76 2.97 × 105
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.00454 432
50.0 0.00529 503
60.0 0.00635 604
70.0 0.00740 705
80.0 0.00846 805
90.0 0.00952 906
100 0.0106 1010
200 0.0212 2010
300 0.0317 3020
400 0.0423 4030
500 0.0529 5030
600 0.0635 6040
700 0.0740 7050
800 0.0846 8050
900 0.0952 9060
1000 0.106 1.01 × 104
2000 0.212 2.01 × 104
3000 0.317 3.02 × 104
4000 0.423 4.03 × 104
5000 0.529 5.03 × 104
6000 0.635 6.04 × 104
7000 0.740 7.05 × 104
8000 0.846 8.05 × 104
9000 0.952 9.06 × 104
1.00 × 104 1.06 1.01 × 105
2.00 × 104 2.12 2.01 × 105
2.95 × 104 3.12 2.97 × 105
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.0111 675
50.0 0.0129 786
60.0 0.0155 944
70.0 0.0181 1100
80.0 0.0207 1260
90.0 0.0232 1420
100 0.0258 1570
200 0.0516 3150
300 0.0775 4720
400 0.103 6290
500 0.129 7860
600 0.155 9440
700 0.181 1.10 × 104
800 0.207 1.26 × 104
900 0.232 1.42 × 104
1000 0.258 1.57 × 104
2000 0.516 3.15 × 104
3000 0.775 4.72 × 104
4000 1.03 6.29 × 104
5000 1.29 7.86 × 104
6000 1.55 9.44 × 104
7000 1.81 1.10 × 105
8000 2.07 1.26 × 105
9000 2.32 1.42 × 105
1.00 × 104 2.58 1.57 × 105
1.89 × 104 4.88 2.97 × 105
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.0230 972
50.0 0.0268 1130
60.0 0.0321 1360
70.0 0.0375 1590
80.0 0.0428 1810
90.0 0.0482 2040
100 0.0535 2270
200 0.107 4530
300 0.161 6800
400 0.214 9060
500 0.268 1.13 × 104
600 0.321 1.36 × 104
700 0.375 1.59 × 104
800 0.428 1.81 × 104
900 0.482 2.04 × 104
1000 0.535 2.27 × 104
2000 1.07 4.53 × 104
3000 1.61 6.80 × 104
4000 2.14 9.06 × 104
5000 2.68 1.13 × 105
6000 3.21 1.36 × 105
7000 3.75 1.59 × 105
8000 4.28 1.81 × 105
9000 4.82 2.04 × 105
1.00 × 104 5.35 2.27 × 105
1.31 × 104 7.02 2.97 × 105
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.0726 1730
50.0 0.0846 2010
60.0 0.102 2420
70.0 0.118 2820
80.0 0.135 3220
90.0 0.152 3620
100 0.169 4030
200 0.338 8050
300 0.508 1.21 × 104
400 0.677 1.61 × 104
500 0.846 2.01 × 104
600 1.02 2.42 × 104
700 1.18 2.82 × 104
800 1.35 3.22 × 104
900 1.52 3.62 × 104
1000 1.69 4.03 × 104
2000 3.38 8.05 × 104
3000 5.08 1.21 × 105
4000 6.77 1.61 × 105
5000 8.46 2.01 × 105
6000 10.2 2.42 × 105
7000 11.8 2.82 × 105
7380 12.5 2.97 × 105
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.177 2700
50.0 0.207 3150
60.0 0.248 3780
70.0 0.289 4400
80.0 0.331 5030
90.0 0.372 5660
100 0.413 6290
200 0.826 1.26 × 104
300 1.24 1.89 × 104
400 1.65 2.52 × 104
500 2.07 3.15 × 104
600 2.48 3.78 × 104
700 2.89 4.40 × 104
800 3.31 5.03 × 104
900 3.72 5.66 × 104
1000 4.13 6.29 × 104
2000 8.26 1.26 × 105
3000 12.4 1.89 × 105
3630 15.0 2.28 × 105
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.368 3890
50.0 0.428 4530
60.0 0.514 5440
70.0 0.600 6340
80.0 0.685 7250
90.0 0.771 8150
100 0.857 9060
200 1.71 1.81 × 104
300 2.57 2.72 × 104
400 3.43 3.62 × 104
500 4.28 4.53 × 104
600 5.14 5.44 × 104
700 6.00 6.34 × 104
800 6.85 7.25 × 104
900 7.71 8.15 × 104
1000 8.57 9.06 × 104
1750 15.0 1.59 × 105
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 0.681 5290
50.0 0.794 6170
60.0 0.952 7400
70.0 1.11 8630
80.0 1.27 9870
90.0 1.43 1.11 × 104
100 1.59 1.23 × 104
200 3.17 2.47 × 104
300 4.76 3.70 × 104
400 6.35 4.93 × 104
500 7.94 6.17 × 104
600 9.52 7.40 × 104
700 11.1 8.63 × 104
800 12.7 9.87 × 104
900 14.3 1.11 × 105
945 15.0 1.17 × 105
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 1.16 6910
50.0 1.35 8050
60.0 1.62 9660
70.0 1.90 1.13 × 104
80.0 2.17 1.29 × 104
90.0 2.44 1.45 × 104
100 2.71 1.61 × 104
200 5.42 3.22 × 104
300 8.12 4.83 × 104
400 10.8 6.44 × 104
500 13.5 8.05 × 104
554 15.0 8.92 × 104
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 1.86 8750
50.0 2.17 1.02 × 104
60.0 2.60 1.22 × 104
70.0 3.04 1.43 × 104
80.0 3.47 1.63 × 104
90.0 3.90 1.83 × 104
100 4.34 2.04 × 104
200 8.67 4.08 × 104
300 13.0 6.12 × 104
346 15.0 7.05 × 104
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 2.84 1.08 × 104
50.0 3.31 1.26 × 104
60.0 3.97 1.51 × 104
70.0 4.63 1.76 × 104
80.0 5.29 2.01 × 104
90.0 5.95 2.27 × 104
100 6.61 2.52 × 104
200 13.2 5.03 × 104
227 15.0 5.71 × 104
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 6.92 1.69 × 104
50.0 8.07 1.97 × 104
60.0 9.68 2.36 × 104
70.0 11.3 2.75 × 104
80.0 12.9 3.15 × 104
90.0 14.5 3.54 × 104
92.9 15.0 3.65 × 104
Steel I Beam: S15 × 42.9 (S15 inch tall × 42.9 lbf/ft)
L = 150 ft
P (lbf/ft) w_max (in) stress_max (psi)
42.9 14.4 2.43 × 104
44.8 15.0 2.54 × 104
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