FACTOR ANALYSIS AND RISK ASSESSMENT OF BRIDGE DAMAGES AT TAKESHI RIVER AND YOJI RIVER BY TYHOON NO. 19 IN 2019

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  • CHIKAHIRO Yuki
    信州大学 工学部水環境・土木工学科
  • OHNO Kumi
    信州大学大学院 総合理工学研究科水環境・土木工学分野
  • ICHIKI Hiroshi
    信州大学大学院 総合理工学研究科水環境・土木工学分野
  • TOYOTA Masashi
    信州大学 工学部水環境・土木工学科

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Other Title
  • 令和元年台風19号における武石川と余地川の橋梁被害の要因分析とリスク評価

Abstract

<p> Typhoon No. 19, which occurred on October 6, 2019, caused a lot of bridge damages resulted by revetment damages in Chikuma River in Shinano River system. It is expected that the risk of the bridge damage can be predicted in advance and the countermeasures can be considered by clarifying the factors that cause the bridge damage to such floods. On the other hand, most of the previous studies have focused on the scour damage, and there have been few cases of damage to the revetments. The purpose of this study is to analyze the factors of 30 bridge damages caused by Typhoon No. 19 in 2019 in Takeshi river in Ueda city and Yoji river in Sakuho town where are the largest number of the bridge damages, and to clarify the parameters useful for determining the presence or absence of damage to the bridge with the revetments based on the linear discriminant analysis. The results showed that, as in previous studies, the influence of parameters such as the year of bridge construction and water depth was significant. In addition, the number of span, the degree of bending, the bridge health, and the cross-sectional shape of the river were also found to affect bridge damage.</p>

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