52. On the Damage to Window Glass in Reinforced Concrete Buildings during the Earthquake of April 20, 1965

概要

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The damage to window glass in reinforced concrete buildingsduring the earthquake of April 20, 1965 is investigated. In order to interpret the cause of damage, the natural periods of the buildings were measured and the deflections were estimated using earthquake response analysis. The results indicate that the deflections areranged between 0.4 and 2.0cm which are between 1/5000 and 1/1000 in angle. From these results and the observation of damage it is concluded that the cause of damage to window glass is not by large displacement but by the "steel sash", "fixed" and "hardened putty".昭和40年4月20日静岡県下におこつた地震により2,3の鉄筋コンクリートビルに窓ガラス被害が生じた.この地震は静岡その他で震度IVの中程度のもので,木造建物では全壊・半壊ともに皆無,壁のきれつなどの小被害が多少あつた程度で,道路その他の被害も軽微であつた.そこでなぜこの程度の地震で近代ビルの窓ガラスが割れたかを考察してみた.はじめガラス被害のあつた建物は骨組の柔らかい長周期のもので,地震特大変形をおこしてそれが窓ガラスに伝わり被害をおこしたと考え,建物の微動を測定して周期を求め,同地方の強震計記録を用いて地震応答解析により地震時の最大層間変位を推算した.
1966-03-25