FraMCoS 7 2010 Jeju, South Korea

An analytical study on the stress strain relation of PVA ECC under tensile fatigue

This study proposes the stress-strain relationship of Engineered Cementitious Composite rein- forced with polyvinyl alcohol fibers (PVA-ECC) under tensile fatigue. The mechanism of fatigue degradation of ECC is bridging stress degradation on crack plane, and the degradation is modeled in…

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Year 2010
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Abstract

This study proposes the stress-strain relationship of Engineered Cementitious Composite rein- forced with polyvinyl alcohol fibers (PVA-ECC) under tensile fatigue. The mechanism of fatigue degradation of ECC is bridging stress degradation on crack plane, and the degradation is modeled in bridging law by in- troducing the change of micromechanical parameters. In this study, fiber fatigue rupture is regarded as a deg- radation factor, and the criterion of fiber fatigue rupture dependent on number of cycles is applied. From the calculated bridging stress-crack opening displacement relationship, it is shown that multiple cracking criterion can be satisfied up to a certain number of fatigue cycles. In order to obtain the stress-strain relationship, the bridging stress-crack opening displacement relationship is introduced into finite element analysis as discrete crack model. The estimated evolution of stress degradation agrees well with the evolution obtained from uni- axial tensile fatigue test of PVA-ECC, showing the validity of the current study.