A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Establishing Seismic Site Class for five Recording Stations in Delhi Based on Theoretical Horizontal to Vertical Spectral Ratio
PESMOS is an extensive database of strong-motion records in India having accelerograms from more than 300 strong-motion recording stations (RSs), located across the country. PESMOS classifies the RSs based on the physical description of local geology. Field studies on some of the RSs reported in previous studies indicate the ambiguity regarding the site class (SC) of RSs assigned by PESMOS. Accurate assessment of local soil conditions of RSs is essential for the proper utilization of accelerograms in seismic hazard and ground response studies. Numerous studies have shown that the predominant frequency (fpeak) obtained from Horizontal to the Vertical Spectral Ratio (HVSR) method can be effectively used to establish SC of a RS. In the current work, theoretical HVSR curves are developed for five RSs in the Delhi region using a MATLAB tool called Model HVSR to obtain the fpeak. Theoretical HVSR curves are modeled as the ratio between transfer functions relative to S waves and P waves. In addition, HVSR curves based on strong motions records are also estimated for each RSs. The value of fpeak obtained from both the above methods are found to be closely matching. Based on the values of fpeak estimated in the present work, SC of RSs is assigned. Present analyses show a clear difference in the SC assigned by PESMOS and the one obtained from the present study. The SC proposed in the present work are also matching with the results of existing field studies.
Establishing Seismic Site Class for five Recording Stations in Delhi Based on Theoretical Horizontal to Vertical Spectral Ratio
PESMOS is an extensive database of strong-motion records in India having accelerograms from more than 300 strong-motion recording stations (RSs), located across the country. PESMOS classifies the RSs based on the physical description of local geology. Field studies on some of the RSs reported in previous studies indicate the ambiguity regarding the site class (SC) of RSs assigned by PESMOS. Accurate assessment of local soil conditions of RSs is essential for the proper utilization of accelerograms in seismic hazard and ground response studies. Numerous studies have shown that the predominant frequency (fpeak) obtained from Horizontal to the Vertical Spectral Ratio (HVSR) method can be effectively used to establish SC of a RS. In the current work, theoretical HVSR curves are developed for five RSs in the Delhi region using a MATLAB tool called Model HVSR to obtain the fpeak. Theoretical HVSR curves are modeled as the ratio between transfer functions relative to S waves and P waves. In addition, HVSR curves based on strong motions records are also estimated for each RSs. The value of fpeak obtained from both the above methods are found to be closely matching. Based on the values of fpeak estimated in the present work, SC of RSs is assigned. Present analyses show a clear difference in the SC assigned by PESMOS and the one obtained from the present study. The SC proposed in the present work are also matching with the results of existing field studies.
Establishing Seismic Site Class for five Recording Stations in Delhi Based on Theoretical Horizontal to Vertical Spectral Ratio
Lecture Notes in Civil Engineering
Sitharam, T. G. (editor) / Kolathayar, Sreevalsa (editor) / Sharma, Mukat Lal (editor) / Harinarayan, N. H. (author) / Kumar, Abhishek (author)
2021-03-23
10 pages
Article/Chapter (Book)
Electronic Resource
English
| British Library Conference Proceedings | 2017