MATERIAL STRENGTH TRANSITION OF CONCRETE AND REBAR IN THE TAISHO AND SHOWA ERA

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  • 大正から昭和時代のコンクリートおよび鉄筋の材料強度の変遷

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<p>In this paper, databases of concrete and rebar strength in the Taisho and Showa era are shown. The results are as follows. </p><p>1. The 1718 concrete compressive strength data of buildings completed from 1911 to 1980 are extracted from documentary records. The means, standard deviation, coefficient of variation and estimated strength are calculated. It shows that the compressive strength of Taisho and early Showa era is relatively high.</p><p>2. The 153 yield strength rebar data of buildings completed from 1911 to 1979 are also extracted. Most of the strength data before 1939 are higher than material strength of SR24.</p>

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