Investigation on fatigue damage mechanism of modern concrete microstructure by lattice model

Title: Investigation on fatigue damage mechanism of modern concrete microstructure by lattice model
Author(s): L.P. Guo, W. Sun, An. Carpinteri, A. Spagnoli, W.Ch. Qin
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 1179 - 1188
Total Pages: 10
Nb references: 9
Language: English

Abstract: The effect of microstructure property on fatigue damage mechanism of modern concrete has been paid much more interest in the last decade. The fatigue damage mechanisms of modern concrete are mainly controlled by the volume fraction and distribution of coarse aggregates as well as the mechanical behaviors of matrix and matrix-aggregate interfacial zone. In order to discover the effect of microstructure on mechanical performance of cementitious composites, the lattice model has been put forward by some experts in Delft (J.G.M. van Mier, E. Schlangen, etc.) one decade ago. However, the most of previous lattice model were established based on the artificial microstructure and the research work mainly focused on the static mechanical behavior of cementitious composites like concrete. In present work, the effects of microstructure properties on damage mechanism of concrete under 4-points bending cyclic loads with constant stress amplitude are investigated by an improved 2D lattice model and micro-focus computer tomography (micro-CT) images of concrete microstructures. The maximum strain and displacement of beam elements in different microstructures are compared with each other. The modeling results of main crack paths in concrete microstructures and the fatigue lives of concretes are consistent with the experimental results. In addition, the numerical results show that the improved lattice model is effective for the investigation of fatigue damage mechanism of concrete under cyclic loading and for the fatigue-life prediction of concrete with different microstructures.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00

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