INVESTIGATION ON FATIGUE DAMAGE MECHANISM OF MODERN CONCRETE MICROSTRUCTURE BY LATTICE MODEL
The effect of microstructure property on fatigue damage mechanism of modern concretehas been paid much more interest in the last decade. The fatigue damage mechanisms ofmodern concrete are mainly controlled by the volume fraction and distribution of coarseaggregates as well as the mechanical behaviors of matrix and matrix-aggregate interfacialzone. In order to discover the effect of microstructure on mechanical performance ofcementitious 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 latticemodel were established based on the artificial microstructure and the research work mainlyfocused on the static mechanical behavior of cementitious composites like concrete. Inpresent work, the effects of microstructure properties on damage mechanism of concreteunder 4-points bending cyclic loads with constant stress amplitude are investigated by animproved 2D lattice model and micro-focus computer tomography (micro-CT) images ofconcrete microstructures. The maximum strain and displacement of beam elements indifferent microstructures are compared with each other. The modeling results of main crackpaths in concrete microstructures and the fatigue lives of concretes are consistent with theexperimental results. In addition, the numerical results show that the improved lattice modelis effective for the investigation of fatigue damage mechanism of concrete under cyclicloading and for the fatigue-life prediction of concrete with different microstructures.
L.P.Guo W.Sun An.Carpinteri A.Spagnoli W.Ch.Qin
Jiangsu Key Laboratory of Construction Materials,Nanjing 211189,China;College of Materials Science & Department of Civil Engineering,University of Parma,Parma 43100,Italy YXLON International X-Ray GmbH Shanghai Rep.Office,Shanghai 200041,China
国际会议
南京
英文
1179-1188
2008-10-13(万方平台首次上网日期,不代表论文的发表时间)