On study for damage detection of non-engineered masonry structures-micro-tremor measurement of damaged buildings by the 2015 Gorkha Earthquake in Nepal
This report focus on the historical construction-style masonry buildings in Nepal about their dynamic vibration characteristics under ambient vibration.Most of these building are considered as non-engineered structures,because they did not have any procedures to design with structural analyses or to construct under material quality control.Accordingly,it seems to be difficult to clarify structural performance of the general masonry buildings in Nepal for anti-seismic property,especially the historical ones.The 2015 Gorkha earthquake in Nepal was the one of the recent hugest earthquakes which caused serious damage and collapse to many historical masonry buildings.As the former study to start this research,by observing and considering about the seismic damages of historical masonry buildings during the Gorkha earthquake,damaged buildings distribution in the specified area,and typical damage pattern and mechanism of historical masonry buildings are surveyed in the old town of Bhaktapur,in the Kathmandu valley of Nepal.Most of historical buildings in this area were non-engineered masonry structures without RC frame and were seriously damaged by the last earthquake.In order to evaluate vibration characteristic of masonry buildings,micro-tremor measurements at the residential buildings where placed in the observation area in Bhaktapur were carried out.22 buildings were measured in this study.Various types of building conditions were included for the measured buildings; newly-constructed type with RC frame or historical type without RC frames,and both including destroyed and un-destroyed ones.Regardless of with/without RC frame or damaged/un-damaged,the primary dominant frequency of buildings were identified around 4 Hz.For buildings without RC frame,some buildings with visible damages show the high-level amplitude in the frequency range over 10 Hz.This result is suggesting that micro-tremor measurement can be applied for detecting damage of non-engineered masonry buildings.
Micro-tremor measurement Non-engineered masonry structure Damage detection Gorkha Nepal earthquake Historical building
M.Takeuchi H.Hoshino Y.Mukai N.Yamamoto M.Masui A.Miyauchi
Department of Architecture,Kobe University,Kobe,Japan Faculty of Human Life and Environment,Nara Womens University,Nara,Japan Faculty of Integrated Human Studies,Kyoto University,Kyoto,Japan
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
2517-2527
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）