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Wide Flange Steel I Beam: W8 × 18
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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Single Span » Wide Flange Steel I Beam » W8 × 18
Wide Flange 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 = 61.9 in4) for the W8 × 18 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
   
Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
18.0 1.74 × 10-5 16.0
20.0 1.93 × 10-5 17.8
30.0 2.90 × 10-5 26.6
40.0 3.87 × 10-5 35.5
50.0 4.83 × 10-5 44.4
60.0 5.80 × 10-5 53.3
70.0 6.77 × 10-5 62.1
80.0 7.73 × 10-5 71.0
90.0 8.70 × 10-5 79.9
100 9.67 × 10-5 88.8
200 1.93 × 10-4 178
300 2.90 × 10-4 266
400 3.87 × 10-4 355
500 4.83 × 10-4 444
600 5.80 × 10-4 533
700 6.77 × 10-4 621
800 7.73 × 10-4 710
900 8.70 × 10-4 799
1000 9.67 × 10-4 888
2000 0.00193 1780
3000 0.00290 2660
4000 0.00387 3550
5000 0.00483 4440
6000 0.00580 5330
7000 0.00677 6210
8000 0.00773 7100
9000 0.00870 7990
1.00 × 104 0.00967 8880
2.00 × 104 0.0193 1.78 × 104
3.00 × 104 0.0290 2.66 × 104
4.00 × 104 0.0387 3.55 × 104
5.00 × 104 0.0483 4.44 × 104
6.00 × 104 0.0580 5.33 × 104
7.00 × 104 0.0677 6.21 × 104
8.00 × 104 0.0773 7.10 × 104
9.00 × 104 0.0870 7.99 × 104
1.00 × 105 0.0967 8.88 × 104
2.00 × 105 0.193 1.78 × 105
3.00 × 105 0.290 2.66 × 105
3.35 × 105 0.323 2.97 × 105
Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
18.0 1.34 × 10-4 44.4
20.0 1.49 × 10-4 49.3
30.0 2.24 × 10-4 74.0
40.0 2.98 × 10-4 98.6
50.0 3.73 × 10-4 123
60.0 4.48 × 10-4 148
70.0 5.22 × 10-4 173
80.0 5.97 × 10-4 197
90.0 6.71 × 10-4 222
100 7.46 × 10-4 247
200 0.00149 493
300 0.00224 740
400 0.00298 986
500 0.00373 1230
600 0.00448 1480
700 0.00522 1730
800 0.00597 1970
900 0.00671 2220
1000 0.00746 2470
2000 0.0149 4930
3000 0.0224 7400
4000 0.0298 9860
5000 0.0373 1.23 × 104
6000 0.0448 1.48 × 104
7000 0.0522 1.73 × 104
8000 0.0597 1.97 × 104
9000 0.0671 2.22 × 104
1.00 × 104 0.0746 2.47 × 104
2.00 × 104 0.149 4.93 × 104
3.00 × 104 0.224 7.40 × 104
4.00 × 104 0.298 9.86 × 104
5.00 × 104 0.373 1.23 × 105
6.00 × 104 0.448 1.48 × 105
7.00 × 104 0.522 1.73 × 105
8.00 × 104 0.597 1.97 × 105
9.00 × 104 0.671 2.22 × 105
1.00 × 105 0.746 2.47 × 105
1.20 × 105 0.899 2.97 × 105
Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
18.0 0.00215 178
20.0 0.00239 197
30.0 0.00358 296
40.0 0.00477 395
50.0 0.00597 493
60.0 0.00716 592
70.0 0.00835 690
80.0 0.00955 789
90.0 0.0107 888
100 0.0119 986
200 0.0239 1970
300 0.0358 2960
400 0.0477 3950
500 0.0597 4930
600 0.0716 5920
700 0.0835 6900
800 0.0955 7890
900 0.107 8880
1000 0.119 9860
2000 0.239 1.97 × 104
3000 0.358 2.96 × 104
4000 0.477 3.95 × 104
5000 0.597 4.93 × 104
6000 0.716 5.92 × 104
7000 0.835 6.90 × 104
8000 0.955 7.89 × 104
9000 1.07 8.88 × 104
1.00 × 104 1.19 9.86 × 104
2.00 × 104 2.39 1.97 × 105
3.00 × 104 3.58 2.96 × 105
3.01 × 104 3.59 2.97 × 105
Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
18.0 0.0109 399
20.0 0.0121 444
30.0 0.0181 666
40.0 0.0242 888
50.0 0.0302 1110
60.0 0.0362 1330
70.0 0.0423 1550
80.0 0.0483 1780
90.0 0.0544 2000
100 0.0604 2220
200 0.121 4440
300 0.181 6660
400 0.242 8880
500 0.302 1.11 × 104
600 0.362 1.33 × 104
700 0.423 1.55 × 104
800 0.483 1.78 × 104
900 0.544 2.00 × 104
1000 0.604 2.22 × 104
2000 1.21 4.44 × 104
3000 1.81 6.66 × 104
4000 2.42 8.88 × 104
5000 3.02 1.11 × 105
6000 3.62 1.33 × 105
7000 4.23 1.55 × 105
8000 4.83 1.78 × 105
9000 5.44 2.00 × 105
1.00 × 104 6.04 2.22 × 105
1.34 × 104 8.09 2.97 × 105
Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
18.0 0.0344 710
20.0 0.0382 789
30.0 0.0573 1180
40.0 0.0764 1580
50.0 0.0955 1970
60.0 0.115 2370
70.0 0.134 2760
80.0 0.153 3160
90.0 0.172 3550
100 0.191 3950
200 0.382 7890
300 0.573 1.18 × 104
400 0.764 1.58 × 104
500 0.955 1.97 × 104
600 1.15 2.37 × 104
700 1.34 2.76 × 104
800 1.53 3.16 × 104
900 1.72 3.55 × 104
1000 1.91 3.95 × 104
2000 3.82 7.89 × 104
3000 5.73 1.18 × 105
4000 7.64 1.58 × 105
4260 8.14 1.68 × 105
Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
18.0 0.0839 1110
20.0 0.0932 1230
30.0 0.140 1850
40.0 0.186 2470
50.0 0.233 3080
60.0 0.280 3700
70.0 0.326 4310
80.0 0.373 4930
90.0 0.420 5550
100 0.466 6160
200 0.932 1.23 × 104
300 1.40 1.85 × 104
400 1.86 2.47 × 104
500 2.33 3.08 × 104
600 2.80 3.70 × 104
700 3.26 4.31 × 104
800 3.73 4.93 × 104
900 4.20 5.55 × 104
1000 4.66 6.16 × 104
1750 8.14 1.08 × 105
Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
18.0 0.174 1600
20.0 0.193 1780
30.0 0.290 2660
40.0 0.387 3550
50.0 0.483 4440
60.0 0.580 5330
70.0 0.677 6210
80.0 0.773 7100
90.0 0.870 7990
100 0.967 8880
200 1.93 1.78 × 104
300 2.90 2.66 × 104
400 3.87 3.55 × 104
500 4.83 4.44 × 104
600 5.80 5.33 × 104
700 6.77 6.21 × 104
800 7.73 7.10 × 104
842 8.14 7.47 × 104
Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
18.0 0.550 2840
20.0 0.611 3160
30.0 0.917 4730
40.0 1.22 6310
50.0 1.53 7890
60.0 1.83 9470
70.0 2.14 1.10 × 104
80.0 2.44 1.26 × 104
90.0 2.75 1.42 × 104
100 3.06 1.58 × 104
200 6.11 3.16 × 104
266 8.14 4.20 × 104
Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
18.0 1.34 4440
20.0 1.49 4930
30.0 2.24 7400
40.0 2.98 9860
50.0 3.73 1.23 × 104
60.0 4.48 1.48 × 104
70.0 5.22 1.73 × 104
80.0 5.97 1.97 × 104
90.0 6.71 2.22 × 104
100 7.46 2.47 × 104
109 8.14 2.69 × 104
Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
18.0 2.78 6390
20.0 3.09 7100
30.0 4.64 1.07 × 104
40.0 6.19 1.42 × 104
50.0 7.73 1.78 × 104
52.6 8.14 1.87 × 104
Steel I Beam: W8 × 18 (Wide Flange 8 inch tall × 18 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
18.0 5.16 8700
20.0 5.73 9670
28.4 8.14 1.37 × 104
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