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In this paper, we analyzed the damage of reinforced concrete buildings due to the 1923 great Kanto Earthquake in the City of Tokyo based on the major two damage investigation reports. One is made by the Shimizu-gumi construction company, which is newly analyzed in this paper, and the other is well known report by the Imperial Earthquake Investigation Committee. As a result, the damage of RC buildings was clearly related with their building type and use, number of floors and distributed area. Detailed investigation on some damaged buildings revealed the situation of reinforced concrete buildings at that time, as well as the properties of damage investigation by a construction company. Microtremor observation and soil boring log collection were newly done at 53 sites of damaged buildings. Surface soil conditions obtained from H/V spectra of microtremor and drilling data were examined and shown to be related with reinforced concrete building damage. The difference of seriously damaged area of reinforced concrete buildings and wooden houses was observed which will be important aspect of seismic hazard distribution in the Tokyo city area.

DAMAGE OF REINFORCED CONCRETE BUILDINGS DURING THE 1923 GREAT KANTO EARTHQUAKE BASED ON DAMAGE INVESTIGATION REPORTS