2008年岩手・宮城内陸地震および岩手県沿岸北部地震における余震観測とRC建物の実挙動に関する研究

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During 2008 lwate-Miyagi Nairiku and Iwate Engan Hokubu earthquakes, aftershock observation was carried out in the three reinforced concrete school buildings from 15 June to 31 July. For the purpose of evaluating the effective seismic load input to the structure, seismographs were installed in both the buildings (1 str floor and top floor) and free held (FF). Response spectra of the aftershock wave recorded from free-field around the school buildings were compared with those obtained from the seismological observatories (K-NET and KiK-NET) near the school buildings and showed different spectrum characteristics despite of near distance. Comparison of the acceleration response spectra between free-field and I floor of the buildings also showed different shape and characteristics. That is, peak period and acceleration amplitude of the buildings were lengthened and reduced, respectively. Earthquake response analysis for a school building subjected to observed aftershock wave was carried out and analytical results were in good agreement with the observed seismic behavior. Main shock of Iwate-Miyagi Nairiku earthquake recorded from KiK-net (IWTH25) was also applied to the analytical model of the school building, and by considering the input loss of seismic load to the building, the analytical results might be consistent with the investigated damage condition of the school building. In addition, seismic behavior of base-isolated RC building was also investigated from the observed records during both earthquakes and earthquake response analyses using MDOF well simulated the displacement response of the base-isolated building.
一般社団法人日本建築学会の論文
2009-03-27

2008年岩手・宮城内陸地震および岩手県沿岸北部地震における余震観測とRC建物の実挙動に関する研究

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