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Glossary » Beams » Simply Supported » Uniformly Distributed Load » Four 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 four equal spans, we compute the displacement at the middle of the first and fourth spans, and the maximum normal stress stress_max occuring at the second and fourth 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 2.58 × 10-6 7.30
100 2.61 × 10-6 7.38
200 5.22 × 10-6 14.8
300 7.82 × 10-6 22.1
400 1.04 × 10-5 29.5
500 1.30 × 10-5 36.9
600 1.56 × 10-5 44.3
700 1.83 × 10-5 51.6
800 2.09 × 10-5 59.0
900 2.35 × 10-5 66.4
1000 2.61 × 10-5 73.8
2000 5.22 × 10-5 148
3000 7.82 × 10-5 221
4000 1.04 × 10-4 295
5000 1.30 × 10-4 369
6000 1.56 × 10-4 443
7000 1.83 × 10-4 516
8000 2.09 × 10-4 590
9000 2.35 × 10-4 664
1.00 × 104 2.61 × 10-4 738
2.00 × 104 5.22 × 10-4 1480
3.00 × 104 7.82 × 10-4 2210
4.00 × 104 0.00104 2950
5.00 × 104 0.00130 3690
6.00 × 104 0.00156 4430
7.00 × 104 0.00183 5160
8.00 × 104 0.00209 5900
9.00 × 104 0.00235 6640
1.00 × 105 0.00261 7380
2.00 × 105 0.00522 1.48 × 104
3.00 × 105 0.00782 2.21 × 104
4.00 × 105 0.0104 2.95 × 104
5.00 × 105 0.0130 3.69 × 104
6.00 × 105 0.0156 4.43 × 104
7.00 × 105 0.0183 5.16 × 104
8.00 × 105 0.0209 5.90 × 104
9.00 × 105 0.0235 6.64 × 104
1.00 × 106 0.0261 7.38 × 104
2.00 × 106 0.0522 1.48 × 105
3.00 × 106 0.0782 2.21 × 105
4.00 × 106 0.104 2.95 × 105
4.03 × 106 0.105 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 1.99 × 10-5 20.3
100 2.01 × 10-5 20.5
200 4.03 × 10-5 41.0
300 6.04 × 10-5 61.5
400 8.05 × 10-5 82.0
500 1.01 × 10-4 102
600 1.21 × 10-4 123
700 1.41 × 10-4 143
800 1.61 × 10-4 164
900 1.81 × 10-4 184
1000 2.01 × 10-4 205
2000 4.03 × 10-4 410
3000 6.04 × 10-4 615
4000 8.05 × 10-4 820
5000 0.00101 1020
6000 0.00121 1230
7000 0.00141 1430
8000 0.00161 1640
9000 0.00181 1840
1.00 × 104 0.00201 2050
2.00 × 104 0.00403 4100
3.00 × 104 0.00604 6150
4.00 × 104 0.00805 8200
5.00 × 104 0.0101 1.02 × 104
6.00 × 104 0.0121 1.23 × 104
7.00 × 104 0.0141 1.43 × 104
8.00 × 104 0.0161 1.64 × 104
9.00 × 104 0.0181 1.84 × 104
1.00 × 105 0.0201 2.05 × 104
2.00 × 105 0.0403 4.10 × 104
3.00 × 105 0.0604 6.15 × 104
4.00 × 105 0.0805 8.20 × 104
5.00 × 105 0.101 1.02 × 105
6.00 × 105 0.121 1.23 × 105
7.00 × 105 0.141 1.43 × 105
8.00 × 105 0.161 1.64 × 105
9.00 × 105 0.181 1.84 × 105
1.00 × 106 0.201 2.05 × 105
1.45 × 106 0.292 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 3.19 × 10-4 81.2
100 3.22 × 10-4 82.0
200 6.44 × 10-4 164
300 9.66 × 10-4 246
400 0.00129 328
500 0.00161 410
600 0.00193 492
700 0.00225 574
800 0.00258 656
900 0.00290 738
1000 0.00322 820
2000 0.00644 1640
3000 0.00966 2460
4000 0.0129 3280
5000 0.0161 4100
6000 0.0193 4920
7000 0.0225 5740
8000 0.0258 6560
9000 0.0290 7380
1.00 × 104 0.0322 8200
2.00 × 104 0.0644 1.64 × 104
3.00 × 104 0.0966 2.46 × 104
4.00 × 104 0.129 3.28 × 104
5.00 × 104 0.161 4.10 × 104
6.00 × 104 0.193 4.92 × 104
7.00 × 104 0.225 5.74 × 104
8.00 × 104 0.258 6.56 × 104
9.00 × 104 0.290 7.38 × 104
1.00 × 105 0.322 8.20 × 104
2.00 × 105 0.644 1.64 × 105
3.00 × 105 0.966 2.46 × 105
3.62 × 105 1.17 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 0.00161 183
100 0.00163 184
200 0.00326 369
300 0.00489 553
400 0.00652 738
500 0.00815 922
600 0.00978 1110
700 0.0114 1290
800 0.0130 1480
900 0.0147 1660
1000 0.0163 1840
2000 0.0326 3690
3000 0.0489 5530
4000 0.0652 7380
5000 0.0815 9220
6000 0.0978 1.11 × 104
7000 0.114 1.29 × 104
8000 0.130 1.48 × 104
9000 0.147 1.66 × 104
1.00 × 104 0.163 1.84 × 104
2.00 × 104 0.326 3.69 × 104
3.00 × 104 0.489 5.53 × 104
4.00 × 104 0.652 7.38 × 104
5.00 × 104 0.815 9.22 × 104
6.00 × 104 0.978 1.11 × 105
7.00 × 104 1.14 1.29 × 105
8.00 × 104 1.30 1.48 × 105
9.00 × 104 1.47 1.66 × 105
1.00 × 105 1.63 1.84 × 105
1.61 × 105 2.63 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 0.00510 325
100 0.00515 328
200 0.0103 656
300 0.0155 984
400 0.0206 1310
500 0.0258 1640
600 0.0309 1970
700 0.0361 2300
800 0.0412 2620
900 0.0464 2950
1000 0.0515 3280
2000 0.103 6560
3000 0.155 9840
4000 0.206 1.31 × 104
5000 0.258 1.64 × 104
6000 0.309 1.97 × 104
7000 0.361 2.30 × 104
8000 0.412 2.62 × 104
9000 0.464 2.95 × 104
1.00 × 104 0.515 3.28 × 104
2.00 × 104 1.03 6.56 × 104
3.00 × 104 1.55 9.84 × 104
4.00 × 104 2.06 1.31 × 105
5.00 × 104 2.58 1.64 × 105
6.00 × 104 3.09 1.97 × 105
7.00 × 104 3.61 2.30 × 105
8.00 × 104 4.12 2.62 × 105
9.00 × 104 4.64 2.95 × 105
9.06 × 104 4.67 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 0.0125 507
100 0.0126 512
200 0.0252 1020
300 0.0377 1540
400 0.0503 2050
500 0.0629 2560
600 0.0755 3070
700 0.0880 3590
800 0.101 4100
900 0.113 4610
1000 0.126 5120
2000 0.252 1.02 × 104
3000 0.377 1.54 × 104
4000 0.503 2.05 × 104
5000 0.629 2.56 × 104
6000 0.755 3.07 × 104
7000 0.880 3.59 × 104
8000 1.01 4.10 × 104
9000 1.13 4.61 × 104
1.00 × 104 1.26 5.12 × 104
2.00 × 104 2.52 1.02 × 105
3.00 × 104 3.77 1.54 × 105
4.00 × 104 5.03 2.05 × 105
5.00 × 104 6.29 2.56 × 105
5.80 × 104 7.29 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 0.0258 730
100 0.0261 738
200 0.0522 1480
300 0.0782 2210
400 0.104 2950
500 0.130 3690
600 0.156 4430
700 0.183 5160
800 0.209 5900
900 0.235 6640
1000 0.261 7380
2000 0.522 1.48 × 104
3000 0.782 2.21 × 104
4000 1.04 2.95 × 104
5000 1.30 3.69 × 104
6000 1.56 4.43 × 104
7000 1.83 5.16 × 104
8000 2.09 5.90 × 104
9000 2.35 6.64 × 104
1.00 × 104 2.61 7.38 × 104
2.00 × 104 5.22 1.48 × 105
3.00 × 104 7.82 2.21 × 105
4.00 × 104 10.4 2.95 × 105
4.03 × 104 10.5 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 0.0816 1300
100 0.0824 1310
200 0.165 2620
300 0.247 3930
400 0.330 5250
500 0.412 6560
600 0.495 7870
700 0.577 9180
800 0.659 1.05 × 104
900 0.742 1.18 × 104
1000 0.824 1.31 × 104
2000 1.65 2.62 × 104
3000 2.47 3.93 × 104
4000 3.30 5.25 × 104
5000 4.12 6.56 × 104
6000 4.95 7.87 × 104
7000 5.77 9.18 × 104
8000 6.59 1.05 × 105
9000 7.42 1.18 × 105
1.00 × 104 8.24 1.31 × 105
1.72 × 104 14.2 2.25 × 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 0.199 2030
100 0.201 2050
200 0.403 4100
300 0.604 6150
400 0.805 8200
500 1.01 1.02 × 104
600 1.21 1.23 × 104
700 1.41 1.43 × 104
800 1.61 1.64 × 104
900 1.81 1.84 × 104
1000 2.01 2.05 × 104
2000 4.03 4.10 × 104
3000 6.04 6.15 × 104
4000 8.05 8.20 × 104
5000 10.1 1.02 × 105
6000 12.1 1.23 × 105
7000 14.1 1.43 × 105
7040 14.2 1.44 × 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 0.413 2920
100 0.417 2950
200 0.835 5900
300 1.25 8850
400 1.67 1.18 × 104
500 2.09 1.48 × 104
600 2.50 1.77 × 104
700 2.92 2.07 × 104
800 3.34 2.36 × 104
900 3.76 2.66 × 104
1000 4.17 2.95 × 104
2000 8.35 5.90 × 104
3000 12.5 8.85 × 104
3390 14.2 1.00 × 105
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 0.765 3980
100 0.773 4020
200 1.55 8030
300 2.32 1.21 × 104
400 3.09 1.61 × 104
500 3.87 2.01 × 104
600 4.64 2.41 × 104
700 5.41 2.81 × 104
800 6.19 3.21 × 104
900 6.96 3.62 × 104
1000 7.73 4.02 × 104
1830 14.2 7.36 × 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 1.31 5190
100 1.32 5250
200 2.64 1.05 × 104
300 3.96 1.57 × 104
400 5.28 2.10 × 104
500 6.59 2.62 × 104
600 7.91 3.15 × 104
700 9.23 3.67 × 104
800 10.6 4.20 × 104
900 11.9 4.72 × 104
1000 13.2 5.25 × 104
1070 14.2 5.63 × 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 2.09 6570
100 2.11 6640
200 4.23 1.33 × 104
300 6.34 1.99 × 104
400 8.45 2.66 × 104
500 10.6 3.32 × 104
600 12.7 3.98 × 104
670 14.2 4.45 × 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 3.19 8120
100 3.22 8200
200 6.44 1.64 × 104
300 9.66 2.46 × 104
400 12.9 3.28 × 104
440 14.2 3.60 × 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 7.78 1.27 × 104
100 7.86 1.28 × 104
180 14.2 2.31 × 104
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