摘要
Site-specific seismic hazard analysis is crucial for designing earthquake resistance structures,particularly in seismically active regions.Shear wave velocity(V_(S))is a key parameter in such analysis,although the economy and other factors restrict its direct field measurement in many cases.Various V_(S)-SPT-N correlations are routinely incorporated in seismic hazard analysis to estimate the value of V_(S).However,many uncertainties question the reliability of these estimated V_(S)values.This paper comes up with a statistical approach to take care of such uncertainties involved in V_(S)calculations.The measured SPT-N values from all the critical boreholes were converted into statistical parameters and passed through various correlations to estimate V_(S)at different depths.The effect of different soil layers in the boreholes on the V_(S)estimation was also taken into account.Further,the average shear wave velocity of the top 30 m soil coverV_(S30))is estimated after accounting for various epistemic and aleatoric uncertainties.The scattering nature of the V_(S)values estimated using different V_(S)-N correlations was reduced significantly with the application of the methodology.Study results further clearly demonstrated the potential of the approach to eliminate various uncertainties involved in the estimation of V_(S)30 using general and soil-specific correlations.
