Available Moment vs. Unbraced Length per AISC 13th Ed. Manual Tables 3-11 & 3-10

Inputs

Lb = 28 ft

Type W

Size W21X182

Fy = 36 ksi

1.7

Results

Plastic Unbraced Length, Lp = 12.49 ft

Inelastic LTB Unbraced Length, Lr = 57.19 ft

Nominal Plastic Flexural Strength, Mp = 1428.00 kip-ft

Nominal Inelastic LTB Flexural Strength, Mr 1428.00 kip-ft

Nominal Moment Strength, Mn = 1428.00 kip-ft

Design Moment Strength, ØMn = 1285.20 kip-ft

Allowable Moment Strength, Mn/Ω = 855.09 kip-ft

Note:

cb =

All current ASTM A6W, S, M, C and MC shapes except W21×48, W14×99, W14×90, W12×65, W10×12, W8×31, W8×10, W6×15, W6×9, W6×8.5, and M4×6 have compact flanges for Fy ≤ 50 ksi (345 MPa); all current ASTM A6 W, S, M, HP, C and MC shapes have compact webs at Fy ≤ 65 ksi (450 MPa).

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Plot of Available Moment vs. Unbraced Length for W21X182

Unbraced Length, Lb (ft)

Avai

labl

e M

omen

t, ki

p-ft

Created by: Rajed Maglinte

0 10 20 30 40 50 60 700.00

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600.00

800.00

1000.00

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Plot of Available Moment vs. Unbraced Length for W21X182

Unbraced Length, Lb (ft)

Avai

labl

e M

omen

t, ki

p-ft

Created by: Rajed Maglinte

6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96

102 108

Mmax= 540 Ma= 472.5 Mb= 495 Mc= 517.5

Cb= 1.07

Pv= 936 k iteracionesFy= 50 KSI Ag(perfil)(KL/r)= 50

x-xLx(pies)=rx=

4.71*√(E/Fy)= 113.43 (kl/r)x=

y-y

Ly(pies)=Fe= 114.49 ry=

(kl/r)y=

øcFcr= 37.48 KSI

(kl/r)mayor= 48.39Ag(inicial)= 24.97 pul2

(KL/r)= 48.39Fe= 122.25

øcFcr= 37.92 KSIAg= 24.00 pul2

BUSCAR OTRO PERFILPv= 910.07 K

-25.93

iteraciones K(columna)24

1 15.006.0529.75

1 10.002.4848.39

48.39

BUSCAR OTRO PERFIL-25.93