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Chapter10 Ultimate Strength of Plates and Stzffened Plates 209
The following effective width formula may be used for compressive loads acting on the long
edge, ah21.0 and short edge, ah<l.O (Mansour, 1997).
(1 0.27)
1 for p <1.25
P’
P
C, = [=-E for 1.255/3<3.5 (10.28)
10.4.2 Plates Under Lateral Pressure
Ultimate strength of plates in shear may be assumed to be shear yield stress.
10.4.3 Shear Strength
Ultimate strength of plates in shear may be assumed to be shear yield stress.
10.4.4 Combined Loads
The equations for plates under combined loads may be found fkom Section 10.2.2.
10.5 Ultimate Strength of Stiffened Panels
10.5.1 Beam-Column Buckling
When a stiffened panel is subjected combined axial stress cs and bending moment M (induced
by lateral load), the ultimate strength may be predicted using Mansour (1997):
M
r7 +eM-- -1 (1 0.29)
Ocolurnn cbeorn
where the column buckling strength for stiffened plates, r7co,u,,,n, may be predicted using
Johnson-Ostenfeld formula or Perry-Robertson formula based on elastic buckling stress:
n2EIs
cTE = (10.30)
CAI
where
E =Elasticity modulus
=Moment of inertia of the stiffened plate
IS
