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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Three Equal Spans » Wide Flange Steel I Beam » W14 × 99
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 = 1110 in4) for the W14 × 99 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
L = 100 ft
L = 125 ft
   
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 3.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 2.79 × 10-6 6.82
100 2.82 × 10-6 6.89
200 5.63 × 10-6 13.8
300 8.45 × 10-6 20.7
400 1.13 × 10-5 27.6
500 1.41 × 10-5 34.4
600 1.69 × 10-5 41.3
700 1.97 × 10-5 48.2
800 2.25 × 10-5 55.1
900 2.53 × 10-5 62.0
1000 2.82 × 10-5 68.9
2000 5.63 × 10-5 138
3000 8.45 × 10-5 207
4000 1.13 × 10-4 276
5000 1.41 × 10-4 344
6000 1.69 × 10-4 413
7000 1.97 × 10-4 482
8000 2.25 × 10-4 551
9000 2.53 × 10-4 620
1.00 × 104 2.82 × 10-4 689
2.00 × 104 5.63 × 10-4 1380
3.00 × 104 8.45 × 10-4 2070
4.00 × 104 0.00113 2760
5.00 × 104 0.00141 3440
6.00 × 104 0.00169 4130
7.00 × 104 0.00197 4820
8.00 × 104 0.00225 5510
9.00 × 104 0.00253 6200
1.00 × 105 0.00282 6890
2.00 × 105 0.00563 1.38 × 104
3.00 × 105 0.00845 2.07 × 104
4.00 × 105 0.0113 2.76 × 104
5.00 × 105 0.0141 3.44 × 104
6.00 × 105 0.0169 4.13 × 104
7.00 × 105 0.0197 4.82 × 104
8.00 × 105 0.0225 5.51 × 104
9.00 × 105 0.0253 6.20 × 104
1.00 × 106 0.0282 6.89 × 104
2.00 × 106 0.0563 1.38 × 105
3.00 × 106 0.0845 2.07 × 105
4.00 × 106 0.113 2.76 × 105
4.31 × 106 0.121 2.97 × 105
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 5.00 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 2.15 × 10-5 18.9
100 2.17 × 10-5 19.1
200 4.34 × 10-5 38.3
300 6.52 × 10-5 57.4
400 8.69 × 10-5 76.5
500 1.09 × 10-4 95.7
600 1.30 × 10-4 115
700 1.52 × 10-4 134
800 1.74 × 10-4 153
900 1.96 × 10-4 172
1000 2.17 × 10-4 191
2000 4.34 × 10-4 383
3000 6.52 × 10-4 574
4000 8.69 × 10-4 765
5000 0.00109 957
6000 0.00130 1150
7000 0.00152 1340
8000 0.00174 1530
9000 0.00196 1720
1.00 × 104 0.00217 1910
2.00 × 104 0.00434 3830
3.00 × 104 0.00652 5740
4.00 × 104 0.00869 7650
5.00 × 104 0.0109 9570
6.00 × 104 0.0130 1.15 × 104
7.00 × 104 0.0152 1.34 × 104
8.00 × 104 0.0174 1.53 × 104
9.00 × 104 0.0196 1.72 × 104
1.00 × 105 0.0217 1.91 × 104
2.00 × 105 0.0434 3.83 × 104
3.00 × 105 0.0652 5.74 × 104
4.00 × 105 0.0869 7.65 × 104
5.00 × 105 0.109 9.57 × 104
6.00 × 105 0.130 1.15 × 105
7.00 × 105 0.152 1.34 × 105
8.00 × 105 0.174 1.53 × 105
9.00 × 105 0.196 1.72 × 105
1.00 × 106 0.217 1.91 × 105
1.55 × 106 0.337 2.97 × 105
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 10.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 3.44 × 10-4 75.8
100 3.48 × 10-4 76.5
200 6.95 × 10-4 153
300 0.00104 230
400 0.00139 306
500 0.00174 383
600 0.00209 459
700 0.00243 536
800 0.00278 612
900 0.00313 689
1000 0.00348 765
2000 0.00695 1530
3000 0.0104 2300
4000 0.0139 3060
5000 0.0174 3830
6000 0.0209 4590
7000 0.0243 5360
8000 0.0278 6120
9000 0.0313 6890
1.00 × 104 0.0348 7650
2.00 × 104 0.0695 1.53 × 104
3.00 × 104 0.104 2.30 × 104
4.00 × 104 0.139 3.06 × 104
5.00 × 104 0.174 3.83 × 104
6.00 × 104 0.209 4.59 × 104
7.00 × 104 0.243 5.36 × 104
8.00 × 104 0.278 6.12 × 104
9.00 × 104 0.313 6.89 × 104
1.00 × 105 0.348 7.65 × 104
2.00 × 105 0.695 1.53 × 105
3.00 × 105 1.04 2.30 × 105
3.88 × 105 1.35 2.97 × 105
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 15.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 0.00174 170
100 0.00176 172
200 0.00352 344
300 0.00528 517
400 0.00704 689
500 0.00880 861
600 0.0106 1030
700 0.0123 1210
800 0.0141 1380
900 0.0158 1550
1000 0.0176 1720
2000 0.0352 3440
3000 0.0528 5170
4000 0.0704 6890
5000 0.0880 8610
6000 0.106 1.03 × 104
7000 0.123 1.21 × 104
8000 0.141 1.38 × 104
9000 0.158 1.55 × 104
1.00 × 104 0.176 1.72 × 104
2.00 × 104 0.352 3.44 × 104
3.00 × 104 0.528 5.17 × 104
4.00 × 104 0.704 6.89 × 104
5.00 × 104 0.880 8.61 × 104
6.00 × 104 1.06 1.03 × 105
7.00 × 104 1.23 1.21 × 105
8.00 × 104 1.41 1.38 × 105
9.00 × 104 1.58 1.55 × 105
1.00 × 105 1.76 1.72 × 105
1.72 × 105 3.03 2.97 × 105
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 20.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 0.00551 303
100 0.00556 306
200 0.0111 612
300 0.0167 918
400 0.0222 1220
500 0.0278 1530
600 0.0334 1840
700 0.0389 2140
800 0.0445 2450
900 0.0500 2760
1000 0.0556 3060
2000 0.111 6120
3000 0.167 9180
4000 0.222 1.22 × 104
5000 0.278 1.53 × 104
6000 0.334 1.84 × 104
7000 0.389 2.14 × 104
8000 0.445 2.45 × 104
9000 0.500 2.76 × 104
1.00 × 104 0.556 3.06 × 104
2.00 × 104 1.11 6.12 × 104
3.00 × 104 1.67 9.18 × 104
4.00 × 104 2.22 1.22 × 105
5.00 × 104 2.78 1.53 × 105
6.00 × 104 3.34 1.84 × 105
7.00 × 104 3.89 2.14 × 105
8.00 × 104 4.45 2.45 × 105
9.00 × 104 5.00 2.76 × 105
9.70 × 104 5.40 2.97 × 105
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 25.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 0.0134 474
100 0.0136 478
200 0.0272 957
300 0.0407 1440
400 0.0543 1910
500 0.0679 2390
600 0.0815 2870
700 0.0950 3350
800 0.109 3830
900 0.122 4310
1000 0.136 4780
2000 0.272 9570
3000 0.407 1.44 × 104
4000 0.543 1.91 × 104
5000 0.679 2.39 × 104
6000 0.815 2.87 × 104
7000 0.950 3.35 × 104
8000 1.09 3.83 × 104
9000 1.22 4.31 × 104
1.00 × 104 1.36 4.78 × 104
2.00 × 104 2.72 9.57 × 104
3.00 × 104 4.07 1.44 × 105
4.00 × 104 5.43 1.91 × 105
5.00 × 104 6.79 2.39 × 105
6.00 × 104 8.15 2.87 × 105
6.21 × 104 8.43 2.97 × 105
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 30.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 0.0279 682
100 0.0282 689
200 0.0563 1380
300 0.0845 2070
400 0.113 2760
500 0.141 3440
600 0.169 4130
700 0.197 4820
800 0.225 5510
900 0.253 6200
1000 0.282 6890
2000 0.563 1.38 × 104
3000 0.845 2.07 × 104
4000 1.13 2.76 × 104
5000 1.41 3.44 × 104
6000 1.69 4.13 × 104
7000 1.97 4.82 × 104
8000 2.25 5.51 × 104
9000 2.53 6.20 × 104
1.00 × 104 2.82 6.89 × 104
2.00 × 104 5.63 1.38 × 105
3.00 × 104 8.45 2.07 × 105
4.00 × 104 11.3 2.76 × 105
4.31 × 104 12.1 2.97 × 105
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 40.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 0.0881 1210
100 0.0890 1220
200 0.178 2450
300 0.267 3670
400 0.356 4900
500 0.445 6120
600 0.534 7350
700 0.623 8570
800 0.712 9800
900 0.801 1.10 × 104
1000 0.890 1.22 × 104
2000 1.78 2.45 × 104
3000 2.67 3.67 × 104
4000 3.56 4.90 × 104
5000 4.45 6.12 × 104
6000 5.34 7.35 × 104
7000 6.23 8.57 × 104
8000 7.12 9.80 × 104
9000 8.01 1.10 × 105
1.00 × 104 8.90 1.22 × 105
1.59 × 104 14.2 1.95 × 105
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 50.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 0.215 1890
100 0.217 1910
200 0.434 3830
300 0.652 5740
400 0.869 7650
500 1.09 9570
600 1.30 1.15 × 104
700 1.52 1.34 × 104
800 1.74 1.53 × 104
900 1.96 1.72 × 104
1000 2.17 1.91 × 104
2000 4.34 3.83 × 104
3000 6.52 5.74 × 104
4000 8.69 7.65 × 104
5000 10.9 9.57 × 104
6000 13.0 1.15 × 105
6520 14.2 1.25 × 105
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 60.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 0.446 2730
100 0.450 2760
200 0.901 5510
300 1.35 8270
400 1.80 1.10 × 104
500 2.25 1.38 × 104
600 2.70 1.65 × 104
700 3.15 1.93 × 104
800 3.60 2.20 × 104
900 4.05 2.48 × 104
1000 4.50 2.76 × 104
2000 9.01 5.51 × 104
3000 13.5 8.27 × 104
3140 14.2 8.66 × 104
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 70.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 0.826 3710
100 0.834 3750
200 1.67 7500
300 2.50 1.13 × 104
400 3.34 1.50 × 104
500 4.17 1.88 × 104
600 5.01 2.25 × 104
700 5.84 2.63 × 104
800 6.68 3.00 × 104
900 7.51 3.38 × 104
1000 8.34 3.75 × 104
1700 14.2 6.36 × 104
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 80.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 1.41 4850
100 1.42 4900
200 2.85 9800
300 4.27 1.47 × 104
400 5.69 1.96 × 104
500 7.12 2.45 × 104
600 8.54 2.94 × 104
700 9.97 3.43 × 104
800 11.4 3.92 × 104
900 12.8 4.41 × 104
995 14.2 4.87 × 104
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 90.0 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 2.26 6140
100 2.28 6200
200 4.56 1.24 × 104
300 6.84 1.86 × 104
400 9.12 2.48 × 104
500 11.4 3.10 × 104
600 13.7 3.72 × 104
621 14.2 3.85 × 104
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 100 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 3.44 7580
100 3.48 7650
200 6.95 1.53 × 104
300 10.4 2.30 × 104
400 13.9 3.06 × 104
407 14.2 3.12 × 104
Steel I Beam: W14 × 99 (Wide Flange 14 inch tall × 99 lbf/ft)
L = 125 ft
P (lbf/ft) w_max (in) stress_max (psi)
99.0 8.40 1.18 × 104
100 8.49 1.20 × 104
167 14.2 2.00 × 104
Additional Information
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FREE Publications
Essentials of Manufacturing

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

CNC Machining Design Guide

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

Mechanical Engineers Outlook

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

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

more publications