Study on Damage and Seismic Performance of Timber Buildings Damaged Due To Large Earthquakes in Recent Japan


Abstract eng:
It is said that Japan has come to the term of seismic activity. Once, the damage of 1948 Fukui Earthquake triggered the establishment of Building Standard Law of Japan including the seismic regulation. The regulation for timber building adopted the way to set up enough shear wall by using the brace. After that, the regulations were reformed and revised several times at every damage due to earthquake. The required shear wall length increased at every revision of regulation. Timber buildings in Japan were damaged due to large earthquake since 2000, for example, 2000 West of Tottori Pref., 2004 Chuetsu, 2005 Fukuoka west off the coast, 2007 Noto Peninsula, 2007 offshore of Chuetsu, 2011 off the Pacific coast of Tohoku earthquake and 2014 Nagano Kamishiro Fault. The damage to timber buildings due to every earthquake was surveyed on site. Several wood houses were picked up and investigated in detail, for example, floor plans, shear wall length, damage states and structural specification. The reason and the characteristic of damage were discussed. The results of these surveys and studies were summarized as follows; - The 14 major earthquake suffering heavy damage to wood houses has occurred after the year of 2000. - The severe damage was concentrated in the old post and beam construction with the mud walls and the heavy roof tiles. On the other hand, the relatively new wood houses were rarely damaged except for due to the damage of land. However, the several new houses built after 2000 collapsed and many new houses suffered the damage under 2016 Kumamoto Earthquake. - The ratio of wood houses with heavy damage was not higher in the area where the higher seismic intensity or acceleration was recorded. However, the ratio was higher in the area with higher velocity. - The shear wall length in the surveyed wood house didn’t have significant difference among the disaster area within our field works. - It was rare that the shear wall length of wood house had a significant correlation with the damage states and the residual story drifts. However, when the shear wall length satisfied with the requirement of BSL, the story drifts were extremely little. - Some wood houses which bio deterioration or termite attacks were found suffered severe damage by all means. So, it couldn’t be concluded that the bio deterioration or termite attacks caused the seismic damage.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4747.:
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