新潟県中越地震における余震観測と被害調査による入力逸散効果の検証

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The paper reports on the aftershock observation and the post-earthquake damage evaluation after Niigata-Chuuetsu Earthquake, October 2004, which was conducted with a specific research objective on identification of input loss of base motion at the foundation and neighborhood soil. A strong motion with very high spectral intensity was recorded during the main shock at K-net Ojiya station. Using the record as the base input motion to structures, large inelastic displacement responses were calculated, although the observed damages to reinforced concrete buildings seemed to be generally less than those estimated from the calculation. The aftershocks were observed at a free field and in a school building nearby the K-net station to identify the difference at these sites. Relatively high aftershock up to the level 2 of the design motion in the Building Standard Law was obtained, where the input motion into the building was obviously reduced from those at the free field and the K-net station, which might be due to the input loss or soil-structure interaction at the neighborhood soil and foundation. The main shocks recorded at the K-net and the JMA stations were assumed as possible input base motions to the structure, while the observed damages to the structure were compared with the calculated responses. It may be concluded from the analyses that the intensity of the main shock into the structure was obviously much less than that of K-net and probably also less than that of JMA.
一般社団法人日本建築学会の論文
2006-03-20

新潟県中越地震における余震観測と被害調査による入力逸散効果の検証

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