7 .F7 Having calculated the strain energy of deformation for both the plate and stiffeners, now compute the work done by the applied load as follows: w w 20 4 3 2 2 20 4 3 2 2 P 0 a 11 6 (x -2ax +ax )dx 6 (y -2by +by )dy l.1378xl0 1 0 P 0 TI = u - W = uplate + ustring - W TI = 2.6685xl0 15 D a 11 2 + 2.0805xl0 15 EI a 11 2 - l.137Bxl0 1 0 P 0 a 11 d TI aa 11 = 5.337xl0 15 D a 11 + 4.1610xl0 15 EI a 11 - l.1378xl0 1 0 P 0
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