4:30 PM - 4:45 PM
[SSS33-11] Modelling of wooden houses in Furukawa district based on damage states during 2011 Tohoku Earthquake
Keywords:damage analysis, Tohoku earthquake, wooden house
Furukawa district, Miyagi, Japan, was subjected to the 2011 off the Pacific coast of Tohoku earthquake (the 2011 Tohoku earthquake) and then some of wooden houses in particular areas were severely damaged. Goto et al. (2012) established a temporal network of seismometers (Furukawa Seismometer Network, FuSeN) in the area, that is very high density networks using more than 30 accelerometers with a spatial interval of about 100 m. By analyzing the earthquake records and ambient vibration records observed by the FuSeN, Goto et al. (2016) proposed a model of local velocity structure in Furukawa district.
Using the velocity structures proposed by Goto et al. (2016), we estimated earthquake motions at each location in Furukawa district and calculated seismic responses of the wooden houses during the 2011 Tohoku earthquake. As both the detailed structures and the exact age at the time of the wooden houses were unclear, we modeled the story stiffness by shear springs and set three types of mass and stiffness model according to Building Standards Act of 1959, 1981 and 2000. Accelerations on the ground surface at each location, which were used as input earthquake motions, were calculated from both linear and nonlinear analyses to discuss the influence of soil nonlinearity on the spatial distribution of seismic damage. From the analytical results for each calculation case, this study examined the possible structure types of wooden houses and settings of analytical conditions that can explain the damage states over the area.