常時微動計測による釧路市内の建築物の振動特性

Abstract

Structural damage of buildings occurred by 1993 Kushiro-oki Earthquake was relativity slight in comparison with the intensity of surface wave. The microtremor observation of the R/C school buildings and the wooden buildings in Kushiro city was carried out to make clear the above input-damage relation and the dynamic soil-structure interaction effects. This paper presents the observation results and the consideration for the relation between the damage level of structures and the dynamic interaction effects.Because the natural frequency of buildings and the predominant frequency of soil-structure system were higher than the predominant frequency of surface soil of many sites in Kushiro city, the response of buildings did not show the remarkable growth. The response was also decreased at the natural frequency of buildings caused by the decreasing of input motion. These relation among above three frequencies correspond with the damage level of the buildings.