Damage Prediction of Long-Period Structures During Subduction Earthquakes- Part2:Prediction of Damage to High-Rise Buildings in the Osaka Basin in Future Nankai Earthquakes

Abstract eng:
High-rise buildings in mega-cities such as Osaka and Nagoya in Japan have a high probability of damage due to strong long-period ground motions from a great subduction earthquake. We predict the damage potential of steel and reinforced concrete high-rise buildings and construct damage prediction maps for the Osaka basin using the long-period ground motions of future Nankai earthquakes predicted in our other paper (Part 1). In this study, a one mass model (an analytical model for the equivalent mass of one degree of freedom) is adopted due to the need for a great deal of earthquake response analysis. We have confirmed through both earthquake observation and analytical results regarding high-rise buildings that the displacement and earthquake input energy of high-rise buildings subjected to long-period ground motion can be approximately estimated by this simple model. Using damage prediction maps, we point out that the dynamic response of high-rise buildings exceeds the present seismic design criteria in wide areas inside the Osaka basin.

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