Consider the two-storey shear frame shown in the Figure. h EI h2EI TITT The following characteristics are provided: Mass matrix m = m ( 4(31) m 2m 2EI U2 21 Stiffness matrix: k = 36EI 3 ha The natural frequencies: w = 4.464 mha W = 5.928 mha The natural mode shapes: = {}, == 4-) The peak response of the two-storey shear frame to a horizontal ground motion characterised by the design spectrum shown in the figure which is scaled to 0.7g peak ground acceleration. Pendo-acclension Alg 0