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Bayesian probabilistic seismic hazard analysis with respect to near-fault effects
Abstract Uniform hazard spectrum (UHS) provides a set of spectral accelerations at various periods which have the same probability of exceedance. In this research, UHS for Bojnord region was determined based on the Bayesian concept as a powerful approach in considering and combining randomness and uncertainties. Source-to-site geometry parameters were included in the seismic hazard analysis to consider the near-fault directivity effects. Results show that near-fault hazard spectra for rock and soil site conditions are 20% larger than ordinary ones at periods longer than 1 s, on average. It was shown that near-fault pulse effects can be approximately included by systemically multiplying ordinary UHS by a near-fault amplification factor. Two-point method modified with the near-fault amplification factor was used to construct design response spectra having the highest similarity with the calculated uniform hazard spectra on different soil site conditions. The parameters of the two-point spectrum found here are close to those of ASCE7, except that the long-period site coefficient for soft soil is 1.21 and 1.10 times those of ASCE7-10 and ASCE7-16, respectively.
Bayesian probabilistic seismic hazard analysis with respect to near-fault effects
Abstract Uniform hazard spectrum (UHS) provides a set of spectral accelerations at various periods which have the same probability of exceedance. In this research, UHS for Bojnord region was determined based on the Bayesian concept as a powerful approach in considering and combining randomness and uncertainties. Source-to-site geometry parameters were included in the seismic hazard analysis to consider the near-fault directivity effects. Results show that near-fault hazard spectra for rock and soil site conditions are 20% larger than ordinary ones at periods longer than 1 s, on average. It was shown that near-fault pulse effects can be approximately included by systemically multiplying ordinary UHS by a near-fault amplification factor. Two-point method modified with the near-fault amplification factor was used to construct design response spectra having the highest similarity with the calculated uniform hazard spectra on different soil site conditions. The parameters of the two-point spectrum found here are close to those of ASCE7, except that the long-period site coefficient for soft soil is 1.21 and 1.10 times those of ASCE7-10 and ASCE7-16, respectively.
Bayesian probabilistic seismic hazard analysis with respect to near-fault effects
Rahimi, Majid (author) / Yahyaabadi, Aliakbar (author)
Asian Journal of Civil Engineering ; 20 ; 341-349
2018-12-01
9 pages
Article (Journal)
Electronic Resource
English
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