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photoThousands of structures were damaged within 30 seconds during the 921 Chi-Chi Earthquake. In addition to existing structures, reinforced concrete structures constructed several hours, even days, before the earthquake were suspected of being damaged. These structures, which were still in the form when the earthquake occurred, did not have distinct visible cracks except for a few. However, using the impact-echo method, voids were frequently detected at the steel-concrete interfaces....




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