Investigation of Damage of Masonry Garden Wall by the Niigata-Ken Chuetsu-Oki Earthquake in 2007

Abstract eng:
In this study, damage of masonry garden walls was investigated. Masonry garden walls such as stone masonry wall and concrete block masonry wall, are frequently used the boundary between each house lot in Japan. The collapse of masonry wall which face street also causes street blockage. Therefore, the damage of masonry wall collapse disturbs evacuation behavior and rescue work. The design standard for masonry garden wall is set in Japan, however existing masonry walls which are not followed the standard are observed by actual condition survey in Niigata city. A fourth of garden walls is not set reinforced steel bar and a half is not set counterfort, respectively. The damage to masonry garden walls by the Niigataken Chuetsu-oki Earthquake in 2007 was surveyed. The collapse of concrete block masonry wall was caused by the insufficiency of reinforced bar or counterfort, corrosion of steel bar and not anchored steel bar. Especially, the rusty reinforced steel bar is severe. The damage ratio of stone masonry wall is eighty percents. Most of collapsed stone masonry walls were not reinforced.

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