This study analyzed the relationship between factors such as weather conditions, geographical conditions, and traffic conditions, and an index considering the rate of deterioration using the degree of soundness in the inspection results, for national highway bridges in Japan. Then, those factors that are likely to influence the deterioration of the soundness were evaluated. The factors with the highest influence were as follows: average temperature, precipitation, years in service, minimum and maximum temperatures for concrete bridges, and years in service, precipitation, minimum and average temperatures for steel bridges.
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