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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Three Equal Spans » Wide Flange Steel I Beam » W8 × 35
Wide Flange 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 = 127 in4) for the W8 × 35 Wide Flange 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
   
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 8.61 × 10-6 12.1
40.0 9.84 × 10-6 13.8
50.0 1.23 × 10-5 17.3
60.0 1.48 × 10-5 20.7
70.0 1.72 × 10-5 24.2
80.0 1.97 × 10-5 27.6
90.0 2.21 × 10-5 31.1
100 2.46 × 10-5 34.5
200 4.92 × 10-5 69.1
300 7.38 × 10-5 104
400 9.84 × 10-5 138
500 1.23 × 10-4 173
600 1.48 × 10-4 207
700 1.72 × 10-4 242
800 1.97 × 10-4 276
900 2.21 × 10-4 311
1000 2.46 × 10-4 345
2000 4.92 × 10-4 691
3000 7.38 × 10-4 1040
4000 9.84 × 10-4 1380
5000 0.00123 1730
6000 0.00148 2070
7000 0.00172 2420
8000 0.00197 2760
9000 0.00221 3110
1.00 × 104 0.00246 3450
2.00 × 104 0.00492 6910
3.00 × 104 0.00738 1.04 × 104
4.00 × 104 0.00984 1.38 × 104
5.00 × 104 0.0123 1.73 × 104
6.00 × 104 0.0148 2.07 × 104
7.00 × 104 0.0172 2.42 × 104
8.00 × 104 0.0197 2.76 × 104
9.00 × 104 0.0221 3.11 × 104
1.00 × 105 0.0246 3.45 × 104
2.00 × 105 0.0492 6.91 × 104
3.00 × 105 0.0738 1.04 × 105
4.00 × 105 0.0984 1.38 × 105
5.00 × 105 0.123 1.73 × 105
6.00 × 105 0.148 2.07 × 105
7.00 × 105 0.172 2.42 × 105
8.00 × 105 0.197 2.76 × 105
8.60 × 105 0.212 2.97 × 105
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 6.65 × 10-5 33.6
40.0 7.59 × 10-5 38.4
50.0 9.49 × 10-5 48.0
60.0 1.14 × 10-4 57.5
70.0 1.33 × 10-4 67.1
80.0 1.52 × 10-4 76.7
90.0 1.71 × 10-4 86.3
100 1.90 × 10-4 95.9
200 3.80 × 10-4 192
300 5.70 × 10-4 288
400 7.59 × 10-4 384
500 9.49 × 10-4 480
600 0.00114 575
700 0.00133 671
800 0.00152 767
900 0.00171 863
1000 0.00190 959
2000 0.00380 1920
3000 0.00570 2880
4000 0.00759 3840
5000 0.00949 4800
6000 0.0114 5750
7000 0.0133 6710
8000 0.0152 7670
9000 0.0171 8630
1.00 × 104 0.0190 9590
2.00 × 104 0.0380 1.92 × 104
3.00 × 104 0.0570 2.88 × 104
4.00 × 104 0.0759 3.84 × 104
5.00 × 104 0.0949 4.80 × 104
6.00 × 104 0.114 5.75 × 104
7.00 × 104 0.133 6.71 × 104
8.00 × 104 0.152 7.67 × 104
9.00 × 104 0.171 8.63 × 104
1.00 × 105 0.190 9.59 × 104
2.00 × 105 0.380 1.92 × 105
3.00 × 105 0.570 2.88 × 105
3.10 × 105 0.588 2.97 × 105
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.00106 134
40.0 0.00122 153
50.0 0.00152 192
60.0 0.00182 230
70.0 0.00213 269
80.0 0.00243 307
90.0 0.00273 345
100 0.00304 384
200 0.00608 767
300 0.00911 1150
400 0.0122 1530
500 0.0152 1920
600 0.0182 2300
700 0.0213 2690
800 0.0243 3070
900 0.0273 3450
1000 0.0304 3840
2000 0.0608 7670
3000 0.0911 1.15 × 104
4000 0.122 1.53 × 104
5000 0.152 1.92 × 104
6000 0.182 2.30 × 104
7000 0.213 2.69 × 104
8000 0.243 3.07 × 104
9000 0.273 3.45 × 104
1.00 × 104 0.304 3.84 × 104
2.00 × 104 0.608 7.67 × 104
3.00 × 104 0.911 1.15 × 105
4.00 × 104 1.22 1.53 × 105
5.00 × 104 1.52 1.92 × 105
6.00 × 104 1.82 2.30 × 105
7.00 × 104 2.13 2.69 × 105
7.74 × 104 2.35 2.97 × 105
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.00538 302
40.0 0.00615 345
50.0 0.00769 432
60.0 0.00923 518
70.0 0.0108 604
80.0 0.0123 691
90.0 0.0138 777
100 0.0154 863
200 0.0308 1730
300 0.0461 2590
400 0.0615 3450
500 0.0769 4320
600 0.0923 5180
700 0.108 6040
800 0.123 6910
900 0.138 7770
1000 0.154 8630
2000 0.308 1.73 × 104
3000 0.461 2.59 × 104
4000 0.615 3.45 × 104
5000 0.769 4.32 × 104
6000 0.923 5.18 × 104
7000 1.08 6.04 × 104
8000 1.23 6.91 × 104
9000 1.38 7.77 × 104
1.00 × 104 1.54 8.63 × 104
2.00 × 104 3.08 1.73 × 105
3.00 × 104 4.61 2.59 × 105
3.44 × 104 5.29 2.97 × 105
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.0170 537
40.0 0.0194 614
50.0 0.0243 767
60.0 0.0292 921
70.0 0.0340 1070
80.0 0.0389 1230
90.0 0.0437 1380
100 0.0486 1530
200 0.0972 3070
300 0.146 4600
400 0.194 6140
500 0.243 7670
600 0.292 9210
700 0.340 1.07 × 104
800 0.389 1.23 × 104
900 0.437 1.38 × 104
1000 0.486 1.53 × 104
2000 0.972 3.07 × 104
3000 1.46 4.60 × 104
4000 1.94 6.14 × 104
5000 2.43 7.67 × 104
6000 2.92 9.21 × 104
7000 3.40 1.07 × 105
8000 3.89 1.23 × 105
9000 4.37 1.38 × 105
1.00 × 104 4.86 1.53 × 105
1.94 × 104 9.41 2.97 × 105
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.0415 839
40.0 0.0475 959
50.0 0.0593 1200
60.0 0.0712 1440
70.0 0.0831 1680
80.0 0.0949 1920
90.0 0.107 2160
100 0.119 2400
200 0.237 4800
300 0.356 7190
400 0.475 9590
500 0.593 1.20 × 104
600 0.712 1.44 × 104
700 0.831 1.68 × 104
800 0.949 1.92 × 104
900 1.07 2.16 × 104
1000 1.19 2.40 × 104
2000 2.37 4.80 × 104
3000 3.56 7.19 × 104
4000 4.75 9.59 × 104
5000 5.93 1.20 × 105
6000 7.12 1.44 × 105
6840 8.12 1.64 × 105
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.0861 1210
40.0 0.0984 1380
50.0 0.123 1730
60.0 0.148 2070
70.0 0.172 2420
80.0 0.197 2760
90.0 0.221 3110
100 0.246 3450
200 0.492 6910
300 0.738 1.04 × 104
400 0.984 1.38 × 104
500 1.23 1.73 × 104
600 1.48 2.07 × 104
700 1.72 2.42 × 104
800 1.97 2.76 × 104
900 2.21 3.11 × 104
1000 2.46 3.45 × 104
2000 4.92 6.91 × 104
3000 7.38 1.04 × 105
3300 8.12 1.14 × 105
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.272 2150
40.0 0.311 2460
50.0 0.389 3070
60.0 0.467 3680
70.0 0.544 4300
80.0 0.622 4910
90.0 0.700 5520
100 0.778 6140
200 1.56 1.23 × 104
300 2.33 1.84 × 104
400 3.11 2.46 × 104
500 3.89 3.07 × 104
600 4.67 3.68 × 104
700 5.44 4.30 × 104
800 6.22 4.91 × 104
900 7.00 5.52 × 104
1000 7.78 6.14 × 104
1040 8.12 6.41 × 104
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 0.665 3360
40.0 0.759 3840
50.0 0.949 4800
60.0 1.14 5750
70.0 1.33 6710
80.0 1.52 7670
90.0 1.71 8630
100 1.90 9590
200 3.80 1.92 × 104
300 5.70 2.88 × 104
400 7.59 3.84 × 104
428 8.12 4.10 × 104
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 1.38 4830
40.0 1.57 5520
50.0 1.97 6910
60.0 2.36 8290
70.0 2.76 9670
80.0 3.15 1.10 × 104
90.0 3.54 1.24 × 104
100 3.94 1.38 × 104
200 7.87 2.76 × 104
206 8.12 2.85 × 104
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 2.55 6580
40.0 2.92 7520
50.0 3.65 9400
60.0 4.38 1.13 × 104
70.0 5.11 1.32 × 104
80.0 5.83 1.50 × 104
90.0 6.56 1.69 × 104
100 7.29 1.88 × 104
111 8.12 2.09 × 104
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 4.35 8590
40.0 4.98 9820
50.0 6.22 1.23 × 104
60.0 7.47 1.47 × 104
65.3 8.12 1.60 × 104
Steel I Beam: W8 × 35 (Wide Flange 8 inch tall × 35 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
35.0 6.98 1.09 × 104
40.0 7.97 1.24 × 104
40.7 8.12 1.27 × 104
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Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

CNC Machining Design Guide

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

Negotiate Your Salary

Learn the best principles to negotiate the salary you deserve!

Essentials of Manufacturing

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

more publications