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S Section Steel I Beam: S12 × 35
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Two Equal Spans » S Section Steel I Beam » S12 × 35
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 = 229 in4) for the S12 × 35 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: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 3.66 × 10-6 12.4
40.0 4.18 × 10-6 14.1
50.0 5.23 × 10-6 17.7
60.0 6.27 × 10-6 21.2
70.0 7.32 × 10-6 24.8
80.0 8.36 × 10-6 28.3
90.0 9.41 × 10-6 31.8
100 1.05 × 10-5 35.4
200 2.09 × 10-5 70.7
300 3.14 × 10-5 106
400 4.18 × 10-5 141
500 5.23 × 10-5 177
600 6.27 × 10-5 212
700 7.32 × 10-5 248
800 8.36 × 10-5 283
900 9.41 × 10-5 318
1000 1.05 × 10-4 354
2000 2.09 × 10-4 707
3000 3.14 × 10-4 1060
4000 4.18 × 10-4 1410
5000 5.23 × 10-4 1770
6000 6.27 × 10-4 2120
7000 7.32 × 10-4 2480
8000 8.36 × 10-4 2830
9000 9.41 × 10-4 3180
1.00 × 104 0.00105 3540
2.00 × 104 0.00209 7070
3.00 × 104 0.00314 1.06 × 104
4.00 × 104 0.00418 1.41 × 104
5.00 × 104 0.00523 1.77 × 104
6.00 × 104 0.00627 2.12 × 104
7.00 × 104 0.00732 2.48 × 104
8.00 × 104 0.00836 2.83 × 104
9.00 × 104 0.00941 3.18 × 104
1.00 × 105 0.0105 3.54 × 104
2.00 × 105 0.0209 7.07 × 104
3.00 × 105 0.0314 1.06 × 105
4.00 × 105 0.0418 1.41 × 105
5.00 × 105 0.0523 1.77 × 105
6.00 × 105 0.0627 2.12 × 105
7.00 × 105 0.0732 2.48 × 105
8.00 × 105 0.0836 2.83 × 105
8.40 × 105 0.0878 2.97 × 105
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 2.82 × 10-5 34.4
40.0 3.23 × 10-5 39.3
50.0 4.03 × 10-5 49.1
60.0 4.84 × 10-5 59.0
70.0 5.65 × 10-5 68.8
80.0 6.45 × 10-5 78.6
90.0 7.26 × 10-5 88.4
100 8.06 × 10-5 98.3
200 1.61 × 10-4 197
300 2.42 × 10-4 295
400 3.23 × 10-4 393
500 4.03 × 10-4 491
600 4.84 × 10-4 590
700 5.65 × 10-4 688
800 6.45 × 10-4 786
900 7.26 × 10-4 884
1000 8.06 × 10-4 983
2000 0.00161 1970
3000 0.00242 2950
4000 0.00323 3930
5000 0.00403 4910
6000 0.00484 5900
7000 0.00565 6880
8000 0.00645 7860
9000 0.00726 8840
1.00 × 104 0.00806 9830
2.00 × 104 0.0161 1.97 × 104
3.00 × 104 0.0242 2.95 × 104
4.00 × 104 0.0323 3.93 × 104
5.00 × 104 0.0403 4.91 × 104
6.00 × 104 0.0484 5.90 × 104
7.00 × 104 0.0565 6.88 × 104
8.00 × 104 0.0645 7.86 × 104
9.00 × 104 0.0726 8.84 × 104
1.00 × 105 0.0806 9.83 × 104
2.00 × 105 0.161 1.97 × 105
3.00 × 105 0.242 2.95 × 105
3.02 × 105 0.244 2.97 × 105
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 4.52 × 10-4 138
40.0 5.16 × 10-4 157
50.0 6.45 × 10-4 197
60.0 7.74 × 10-4 236
70.0 9.03 × 10-4 275
80.0 0.00103 314
90.0 0.00116 354
100 0.00129 393
200 0.00258 786
300 0.00387 1180
400 0.00516 1570
500 0.00645 1970
600 0.00774 2360
700 0.00903 2750
800 0.0103 3140
900 0.0116 3540
1000 0.0129 3930
2000 0.0258 7860
3000 0.0387 1.18 × 104
4000 0.0516 1.57 × 104
5000 0.0645 1.97 × 104
6000 0.0774 2.36 × 104
7000 0.0903 2.75 × 104
8000 0.103 3.14 × 104
9000 0.116 3.54 × 104
1.00 × 104 0.129 3.93 × 104
2.00 × 104 0.258 7.86 × 104
3.00 × 104 0.387 1.18 × 105
4.00 × 104 0.516 1.57 × 105
5.00 × 104 0.645 1.97 × 105
6.00 × 104 0.774 2.36 × 105
7.00 × 104 0.903 2.75 × 105
7.56 × 104 0.975 2.97 × 105
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.00229 309
40.0 0.00261 354
50.0 0.00327 442
60.0 0.00392 531
70.0 0.00457 619
80.0 0.00523 707
90.0 0.00588 796
100 0.00653 884
200 0.0131 1770
300 0.0196 2650
400 0.0261 3540
500 0.0327 4420
600 0.0392 5310
700 0.0457 6190
800 0.0523 7070
900 0.0588 7960
1000 0.0653 8840
2000 0.131 1.77 × 104
3000 0.196 2.65 × 104
4000 0.261 3.54 × 104
5000 0.327 4.42 × 104
6000 0.392 5.31 × 104
7000 0.457 6.19 × 104
8000 0.523 7.07 × 104
9000 0.588 7.96 × 104
1.00 × 104 0.653 8.84 × 104
2.00 × 104 1.31 1.77 × 105
3.00 × 104 1.96 2.65 × 105
3.36 × 104 2.19 2.97 × 105
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.00723 550
40.0 0.00826 629
50.0 0.0103 786
60.0 0.0124 943
70.0 0.0145 1100
80.0 0.0165 1260
90.0 0.0186 1410
100 0.0206 1570
200 0.0413 3140
300 0.0619 4720
400 0.0826 6290
500 0.103 7860
600 0.124 9430
700 0.145 1.10 × 104
800 0.165 1.26 × 104
900 0.186 1.41 × 104
1000 0.206 1.57 × 104
2000 0.413 3.14 × 104
3000 0.619 4.72 × 104
4000 0.826 6.29 × 104
5000 1.03 7.86 × 104
6000 1.24 9.43 × 104
7000 1.45 1.10 × 105
8000 1.65 1.26 × 105
9000 1.86 1.41 × 105
1.00 × 104 2.06 1.57 × 105
1.89 × 104 3.90 2.97 × 105
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.0176 860
40.0 0.0202 983
50.0 0.0252 1230
60.0 0.0302 1470
70.0 0.0353 1720
80.0 0.0403 1970
90.0 0.0454 2210
100 0.0504 2460
200 0.101 4910
300 0.151 7370
400 0.202 9830
500 0.252 1.23 × 104
600 0.302 1.47 × 104
700 0.353 1.72 × 104
800 0.403 1.97 × 104
900 0.454 2.21 × 104
1000 0.504 2.46 × 104
2000 1.01 4.91 × 104
3000 1.51 7.37 × 104
4000 2.02 9.83 × 104
5000 2.52 1.23 × 105
6000 3.02 1.47 × 105
7000 3.53 1.72 × 105
8000 4.03 1.97 × 105
9000 4.54 2.21 × 105
1.00 × 104 5.04 2.46 × 105
1.21 × 104 6.10 2.97 × 105
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.0366 1240
40.0 0.0418 1410
50.0 0.0523 1770
60.0 0.0627 2120
70.0 0.0732 2480
80.0 0.0836 2830
90.0 0.0941 3180
100 0.105 3540
200 0.209 7070
300 0.314 1.06 × 104
400 0.418 1.41 × 104
500 0.523 1.77 × 104
600 0.627 2.12 × 104
700 0.732 2.48 × 104
800 0.836 2.83 × 104
900 0.941 3.18 × 104
1000 1.05 3.54 × 104
2000 2.09 7.07 × 104
3000 3.14 1.06 × 105
4000 4.18 1.41 × 105
5000 5.23 1.77 × 105
6000 6.27 2.12 × 105
7000 7.32 2.48 × 105
8000 8.36 2.83 × 105
8400 8.78 2.97 × 105
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.116 2200
40.0 0.132 2520
50.0 0.165 3140
60.0 0.198 3770
70.0 0.231 4400
80.0 0.264 5030
90.0 0.297 5660
100 0.330 6290
200 0.661 1.26 × 104
300 0.991 1.89 × 104
400 1.32 2.52 × 104
500 1.65 3.14 × 104
600 1.98 3.77 × 104
700 2.31 4.40 × 104
800 2.64 5.03 × 104
900 2.97 5.66 × 104
1000 3.30 6.29 × 104
2000 6.61 1.26 × 105
3000 9.91 1.89 × 105
3630 12.0 2.28 × 105
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.282 3440
40.0 0.323 3930
50.0 0.403 4910
60.0 0.484 5900
70.0 0.565 6880
80.0 0.645 7860
90.0 0.726 8840
100 0.806 9830
200 1.61 1.97 × 104
300 2.42 2.95 × 104
400 3.23 3.93 × 104
500 4.03 4.91 × 104
600 4.84 5.90 × 104
700 5.65 6.88 × 104
800 6.45 7.86 × 104
900 7.26 8.84 × 104
1000 8.06 9.83 × 104
1490 12.0 1.46 × 105
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.585 4950
40.0 0.669 5660
50.0 0.836 7070
60.0 1.00 8490
70.0 1.17 9900
80.0 1.34 1.13 × 104
90.0 1.51 1.27 × 104
100 1.67 1.41 × 104
200 3.34 2.83 × 104
300 5.02 4.24 × 104
400 6.69 5.66 × 104
500 8.36 7.07 × 104
600 10.0 8.49 × 104
700 11.7 9.90 × 104
718 12.0 1.02 × 105
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 1.08 6740
40.0 1.24 7700
50.0 1.55 9630
60.0 1.86 1.16 × 104
70.0 2.17 1.35 × 104
80.0 2.48 1.54 × 104
90.0 2.79 1.73 × 104
100 3.10 1.93 × 104
200 6.20 3.85 × 104
300 9.29 5.78 × 104
387 12.0 7.46 × 104
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 1.85 8800
40.0 2.11 1.01 × 104
50.0 2.64 1.26 × 104
60.0 3.17 1.51 × 104
70.0 3.70 1.76 × 104
80.0 4.23 2.01 × 104
90.0 4.76 2.26 × 104
100 5.29 2.52 × 104
200 10.6 5.03 × 104
227 12.0 5.71 × 104
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 2.96 1.11 × 104
40.0 3.39 1.27 × 104
50.0 4.23 1.59 × 104
60.0 5.08 1.91 × 104
70.0 5.93 2.23 × 104
80.0 6.77 2.55 × 104
90.0 7.62 2.87 × 104
100 8.47 3.18 × 104
142 12.0 4.51 × 104
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 4.52 1.38 × 104
40.0 5.16 1.57 × 104
50.0 6.45 1.97 × 104
60.0 7.74 2.36 × 104
70.0 9.03 2.75 × 104
80.0 10.3 3.14 × 104
90.0 11.6 3.54 × 104
93.0 12.0 3.65 × 104
Steel I Beam: S12 × 35 (S12 inch tall × 35 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 11.0 2.15 × 104
38.1 12.0 2.34 × 104
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