Fatigue Life Prediction of Steel Bridges for Extreme Loading Using a New Damage Indicator
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概要
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High cycle fatigue (HCF) damage caused by normal traffic loading is one of the major modes of failures in steel bridges. During bridge service life, there are extreme loading situations such as typhoons, earthquakes which cause higher amplitude loading than normal traffic loading. Due to this reason, critical members could undergo overstress cycles in the plastic range. Therefore, such members are subjected to low cycle fatigue (LCF) during these situations while subjecting to HCF in serviceable condition. Bridges, which are not seriously damaged, generally continue to be functioned after these extreme loading situations and fatigue life estimation is required to ensure their safety. Therefore, this paper presents a new damage indicator based fatigue model to predict life of steel bridges due to combined effect of extreme and normal traffic loadings. It consists of a modified strain life curve and a strain based damage indicator. Both the strain life curve and the damage indicator are newly proposed in the study. Modified strain life curve consists of Coffin Manson relation in the LCF regime and a new strain life curve in the HCF regime. Damage variable is based on von Mises equivalent strain and modified by factors to consider effects of loading non proportionality and loading path in multiaxial stress state. The new damage indicator can capture the loading sequence effect. The proposed model is verified with experimental test results of combined HCF and LCF of three materials; S304L stainless steel, Haynes 188 (a Cobolt superalloy) and S45C steel obtained from the literature. The verification of experimental results confirms the validity of the proposed model.
著者
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OHGA Mitao
Department of Civil & Environmental Engineering, Ehime University
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OHGA Mitao
Department of Civil and Environmental Engineering, Ehime University
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DISSANAYAKE Punchi
Department of Civil Engineering, University of Peradeniya
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SIRIWARDANE Siriwardane
Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger
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KARUNANANDA Pallaha
Department of Civil and Environmental Engineering, Ehime University
関連論文
- Fatigue Life Prediction of Steel Bridges for Extreme Loading Using a New Damage Indicator
- Influence of Corrosion Damage on Prediction of Residual Strength Capacities - An Experimental Analysis