Frontiers of Structural and Civil Engineering
>> 2021,
Volume 15,
Issue 5
doi:
10.1007/s11709-021-0749-1
Accounting for the uncertainties in the estimation of average shear wave velocity using – correlations
Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India;Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Received: 2021-02-07
Accepted: 2021-10-09
Available online: 2021-10-15
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Abstract
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 Vs estimation was also taken into account. Further, the average shear wave velocity of the top 30 m soil cover ( V 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 S30 using general and soil-specific correlations.
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