Evaluation of damage to a historic masonry building in Nepal through comparison of dynamic characteristics before and after the 2015 gorkha earthquake

Aiko Furukawa*, Junji Kiyono, Rishi Ram Parajuli, Hari Ram Parajuli, Kenzo Toki

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

4 Citations (Scopus)
167 Downloads (Pure)

Abstract

On April 25, 2015, a M w 7.8 earthquake struck the Gorkha district of Kathmandu, Nepal. In Patan, vibrational characteristics of a 300-year-old two-story masonry building near Patan Durbar Square had been measured prior the Gorkha earthquake. In the inspection of the building after the Gorkha earthquake, several new cracks were found. The vibrational characteristics of the building were measured again, and it was found that the natural frequencies after the earthquake were smaller than those before the earthquake, indicating the reduction of the stiffness. Finite element models of the structure representing pre- and post-earthquake conditions are established so that the natural frequencies match the pre- and post-earthquake measurements and the structural damage is identified based on the stiffness reduction. Finally, the dynamic analysis of the finite element model of the building in the pre-earthquake condition using the observed ground motion record during the Gorkha earthquake as the input is conducted, and the structural response of the building during the Gorkha earthquake is discussed.

Original languageEnglish
Article number62
Number of pages16
JournalFrontiers in Built Environment
Volume3
DOIs
Publication statusPublished - 31 Oct 2017

Keywords

  • Earthquake damage
  • Finite element model
  • Gorkha earthquake
  • Historic masonry building
  • Nepal
  • Stiffness reduction
  • Vibrational characteristics

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