抄録
Such steel structures as steel stacks, boiler frames, etc. are usually designed by the elastic theory. The author tried to establish the method of the aseismatic elastic design by statistical method. First be derived the formulae to estimate the response of general structures to the ground motion of two perpendicular directions, assuming that the seismic phenomena is a steady, Gaussian, and ergodic process. These formulae are proved to have sufficient accuracy by the random shaking table tests for the models of several framed structures. Second he applied the theory to the actual seismic waves, introducing the concept of the average earthquake continuation time. Finally a practical response specrum is proposed, which covers the whole response range to the seismic wave recorded in the past.
