DERIVATION OF SEISMIC DESIGN PARAMETERS USING TYPICAL NEAR-FAULT STRONG MOTION

On the basis of typical near-fault ground motions, relations between motion pulse amplitudes and periods are utilized to scale the difference of near-fault motions between rock and soil sites. Features of pseudo-velocity response spectra (PVS), normalized pseudo-velocity spectra (NPVS) and bi-normalized pseudo-velocity spectra (BNPVS) are examined by considering the influence of site conditions. Observations show that the use of parameters V and Tp for the normalization of PVS can effectively reduce the scatter, in particular the response spectra of long period range; ground motion pulse waveforms are affected by local site conditions, BNPVS values at soil sites are larger than these of rock sites at normalized period T/Tv less than about 0.7, while at relative periods larger than 0.7 the reverse is true; spectral peak value of BNPVS at rock sites is evidently higher than that of soil sites. Using simple pulses and available predictive relationships for near-fault motion, acceleration response spectra of the near-fault region are developed. The BNPVS are finally used to test the applicability of the established design spectra.

کلیدواژه ها:

Near-Fault ، Pulse ، Attenuation Relations ، Bi-Normalized-Pseudo-Velocity Spectrum