Effect of Phase Characteristic of Seismic Wave on the Response of Structures

In seismic resistance design, the design seismic motion is usually defined by elastic response spectra to reflect the characteristic in frequency. Whilst, either the phase of a reference seismic record or random phase is used in generation of artificial wave. The influence of phase on structural response can not be properly defined, as it is often omitted for linear elastic responses. But for the seismic design taking structural damage into account, the phase properties of wave are not negligible. In the study, a determinate method with only two parameters for phase properties of wave has been proposed. This makes it possible to generate a seismic wave, which fits both expected elastic response spectra and expected Demanded Strength Spectra. Similar to the considerations for design elastic response spectra, the level of Demanded Strength Spectra for design can also be determined for the observed records.