We performed a benchmark test for strong motion simulation methods using numerical methods (finite difference method and finite element method). We simulated four observed earthquakes considering a Kanto basin model. All the results calculated by six teams from different institutions generally show good agreement to each other. We found that the choice of grid space makes difference of allocation of soil parameters near the surface. It generates difference of waveforms.

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During the 2011 Tohoku earthquake super high-rise RC buildings constructed in the coastal area of Tokyo Bay were suffered from strong shaking including long period components with long duration time. This paper describes dynamic behavior of a super high-rise RC building using the moment-resisting frame system mainly focusing on seismic performance of pile group. Earthquake motions recorded at 3 floors in the building during the 3.11 mainshock are well simulated by the 3-D frame model with piles and surrounding soil by using recorded motions obtained at the pile tip depth level. Piles stresses are also investigated considering flexure of foundation beams and past nonlinear behavior. Seismic performance evaluation for the future scenario earthquakes is also discussed mainly focusing on variation of stresses and curvatures of piles.

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