Artificial ground motion compatible with specified peak velocity and target spectrum

In this paper, a method, which synthesizes the artificial ground motion compatible with the specified peak velocity as well as the target acceleration response spectrum, was proposed. In this method, firstly, an initial acceleration time history) a(g)((0))(t) which satisfies the prescribed peak ground acceleration, the target spectral acceleration S-T(omega,zeta), and the specified intensity envelope, is generated by the traditional method that generates the response- spectrum-compatible artificial ground motion by modifying the Fourier amplitude spectrum in the frequency domain; secondly,) a(g)((0))(t)is further modulated by superimposing narrow-band time histories upon it in the time domain to make its peak velocity, approach the target peak ground velocity, and at the same time to improve its fitting precision to the target spectrum. Numerical examples show that this algorithm boasts high calculation precisions.