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Advances in Civil Engineering
Volume 2018, Article ID 4720564, 9 pages
https://doi.org/10.1155/2018/4720564
Research Article

Effect of Low-Stress Fatigue on the Off-Crack-Plane Fracture Energy in Engineered Cementitious Composites

1School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
2School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
3Department of Structures and Materials, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

Correspondence should be addressed to Dahai Huang; moc.qq@15730795

Received 27 August 2017; Revised 16 November 2017; Accepted 21 November 2017; Published 4 March 2018

Academic Editor: Peng Zhang

Copyright © 2018 Longlong Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presented an experimental study on the flexural properties of engineered cementitious composites (ECCs). The bending fatigue damage, residual deformation, and damage characteristics were investigated after a certain number of low stress levels in fatigue load. The composite fracture energy and fiber-bridging fracture energy were calculated by the J integral. It is observed that the number of cracks increased with the increment of stress levels, and most of the cracks were formed during the earlier stage of the dynamic test. The deformation capability decreased with the increment of stress levels while the reduction of the ultimate load was minor after the dynamic load. Furthermore, the strain-hardening phenomenon of the specimen enhanced initially and then weakened with the increment of stress levels. The residual equivalent yield strength became smaller with the increase of stress levels. Meanwhile, the trend was mild at low stress levels and then became steep at high stress levels.