INVESTIGATION OF NATURAL FREQUENCY REDUCTION MECHANISM OF A HISTORIC MASONRY BUILDING IN PATAN FOLLOWING THE 2015 GORKHA EARTHQUAKE IN NEPAL

INVESTIGATION OF NATURAL FREQUENCY REDUCTION MECHANISM OF A HISTORIC MASONRY BUILDING IN PATAN FOLLOWING THE 2015 GORKHA EARTHQUAKE IN NEPAL

On April 25, 2015, Gorkha earthquake occurred about 80 km northwest of Kathmandu. In Patan, masonry structures collapsed in Durbar Square. The two-story masonry building that is the subject of this study, is about a 5-minute walk from Durbar Square. Although the building did not collapse, cracks wer...

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Veröffentlicht in:Journal of Japan Association for Earthquake Engineering 2019, Vol.19(8), pp.8_19-8_37
Hauptverfasser: FURUKAWA, Aiko, HANAFUSA, Rikuto, KIYONO, Junji, PARAJULI, Rishi R.
Format: Artikel
Sprache:eng
Schlagworte:
Aseismic buildings
Collapse
Cracks
Damage analysis
Earthquakes
Gorkha earthquake
Ground motion
Historic buildings & sites
Historic masonry building
Historical buildings
Historical structures
Masonry
Nepal
Refined DEM
Resonant frequencies
Resonant frequency
Response analysis
Seismic activity
Seismic analysis
Seismic response
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Zusammenfassung:On April 25, 2015, Gorkha earthquake occurred about 80 km northwest of Kathmandu. In Patan, masonry structures collapsed in Durbar Square. The two-story masonry building that is the subject of this study, is about a 5-minute walk from Durbar Square. Although the building did not collapse, cracks were confirmed in several places. Microtremor measurements performed before and after the earthquake revealed that the natural frequencies of the building decreased. This study examined the factors that decrease the natural frequencies of buildings by seismic response analysis using ground motion estimated by the H/V spectrum ratio as input.
ISSN:1884-6246
1884-6246
DOI:10.5610/jaee.19.8_19