Change in Physical Properties with Time on an Isolated and a Conventional RC Three-Story Buildings during the 2011 Tohoku Earthquake Using the CERS Methods

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Key Points

The research aims to analyze changes in physical properties and wave propagation times of isolated and conventional RC buildings during the 2011 Tohoku earthquake.
Analyzed public digital waveforms recorded during the Tohoku earthquake.
Evaluated wave propagation times within isolated and conventional RC buildings using CERS methods.
Focused on differences between the short and long directions of the buildings.
In conventional buildings, wave propagation time increased significantly compared to isolated buildings, especially in the short direction.
Damping ratios were reported at 6%-8% for conventional buildings and approximately 2% for isolated buildings.
Damage was minimal in isolated buildings, whereas significant damage occurred in conventional buildings.

Analyzes wave propagation differences in isolated and conventional RC buildings, indicating varying damage levels.

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NAKAMURA et al. (2026) studied this question.

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