he two-story shear frame of Figure 1 has the following properties: h = 12 ft, m = 100 kips/g, I = 727 in4 for beams and columns, and E = 29,000 ksi, and = 5%. Figure 1 (a) Write the equation of motion considering the frame as a 2 degrees of freedom system. (b) Identify the system's mode shapes and modal frequencies. (c) Build the Rayleigh damping matrix for the system