What is the required column stiffness of a one-story structure to limit its acceleration amplitude to \(2.1 \mathrm{~m} / \mathrm{s}^{2}\) during an earthquake whose acceleration amplitude is \(150 \mathrm{~mm} / \mathrm{s}^{2}\) at a frequency of \(50 \mathrm{rad} / \mathrm{s}\) ? The mass of structure is \(1800 \mathrm{~kg}\). Assume a damping ratio of 0.05 .