数量化分析I類およびファジィ理論を用いた橋梁の洪水時安全度評価

概要

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In order to quantitatively grasp what kind of factor has significant influence on the safety of bridge suffering from a flood, a method based on quantification theory No. 1 and the one based on a fuzzy set theory have been put forward. Eleven factors, namely construction year, reduced clearance height, standard span length ratio, obstruction ratio of high-level water flow, decrease ratio of embedment depth of bridge foundation, normal line geometry of bank, riverbed condition, riverbed gradient, type of superstructure, type of substructure, and shape of pier, are extracted in this study. Forty-four bridges constructed in Fuji River basin and twenty-five ones existing in Abe River and Oi River basins are used as the sample. It has been revealed that the factors such as construction year, normal line geometry of bank and decrease ratio of embedment depth of bridge foundation have considerable effect on the safety of bridge when it suffers from a flood, whereas obstruction ratio of high-level water flow and riverbed gradient are relatively minor factors.
山梨大学の論文