Proceedings of the JSCE Earthquake Engineering Symposium
巻
28
ページ
137
発行年
2005
ISSN
1880-4624
1884-846X
NCID
AA12305816
DOI
10.11532/proee2005a.28.137
出版者
土木学会 Japan Society of Civil Engineers
抄録
一般に地震動の破壊力を示す指標として、計測震度等が用いられている。しかし、これらの指標は地震動により構造物が何回揺らされ、疲労がどのくらい蓄積されたかという点を考慮していない。特に2004年新潟県中越地震では本震後の余震によって木造構造物の破壊が拡大した。そこで本研究では木造構造物破壊に及ぼす地震動の累積による影響について検討するとともに、地震動の繰り返しを考慮した疲労応答スペクトル強度指標を適用し, 被害との関係について考察する。その結果、地震動の累積による構造物被害への影響を明らかにし、余震による地震動の累積を考慮できる、本研究で提案する地震動破壊力指標の有効性を示すことができた。
In general, peak ground acceleration (PGA), peak ground velocity (PGV), seismic intensity and spectral intensity (SI) have been used as the indices of destructive power on earthquake motion. However, it is quite important to consider the number of earthquake response cycles in the vicinity of the maximum response and natural period of structures for predicting damage to structures. Especially, destruction of the wooden structure was expanded by aftershock after the main shock in 2004 Niigata-ken Chuetsu earthquake. In this study, the influence by accumulation of the earthquake motion on wooden structure destruction is considered. The fatigue response spectral intensity (FSI) of having taken the repetition of earthquake motion into consideration is applied, and a relation with wooden structure damage is considered. This index, which is called as FSI, is defined as integrated value on tripartite coordinates: natural period of wooden structures, pseudo-response velocity spectra and number of seismic response cycles. FSI was calculated by using the response to recent earthquakes in Japan such as the 2004 Niigata-ken Chuetsu Earthquake and so on. As a result, it was clarified that accumulation of an earthquake motion influences structure damage and the earthquake motion destructive power index proposed by this research that accumulation of the earthquake motion by aftershock can be taken into consideration is effective. Based on this study it is concluded that FSI value demonstrate the damage ratio more accurately than alternative indices such as seismic intensity, PGV, and SI value.
応答の繰り返しを考慮した地震動破壊力指標の新潟県中越地震被害への適用
.png)
TE-PR-MIYAJIMA-M-28_137.pdf
(648.19KB)
