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【第5回舗装工学講演会講演論文集 2000年12月】 |
舗装工学論文集 Vol. 5, 59-66, 2000.12 |
Shisheng WU1 and Yoshitaka HACHIYA2
1Dr. Eng., STA Fellow, Runways Laboratory, Port
and Harbor Research Institute, Ministry of Transport
(1-1, Nagase 3, Yokosuka 239-0826, Japan)
2Member of JSCE, Dr. Eng., Chief, Runways
Laboratory, Port and Harbor Research Institute, Ministry of Transport
Through a series of experiment in laboratory, this paper mainly clarifies the effects of the factors such as maximum stress level, minimum stress level, loading frequency and rest period on the fatigue life of concrete for airport pavement, and analyzes the failure probability due to flexural fatigue under different stress level. As a result, it is found that under high stress level, namely the maximum stress level is equal to or greater than 80%, the minimum stress level has no clear influence on the fatigue life of concrete, but when the maximum stress level is 70% its effect can not be ignored. Accordingly, the flexural fatigue equation of concrete for airport pavement, considering the minimum stress level, is derived.
Key Words: flexural fatigue equation, concrete, stress level, loading frequency, rest period, airport pavement
伍 石生・八谷好高
本研究では，室内試験により，空港舗装に使用されるコンクリートの曲げ疲労 寿命に上限応力，下限応力，載荷速度，休止時間といった要因が及ぼす影響を明ら かにし，曲げ疲労による破壊確率について解析した．その結果，上限応力が80％も しくはそれ以上では下限応力による影響は明らかではないが，上限応力が70%の場 合にはその影響は無視できないことがわかった．そして，この点を考慮に入れた空 港舗装用コンクリートの曲げ疲労式を算定した．