Research and application of random aggregate model in determining the fracture behavior of four-point bending beam with notch

• Published in: Construction & building materials Vol. 202; pp. 276 - 289
• Main Authors: Peng, Cao, Guodong, Li, Jiangjiang, Yu, Ming, Zhang, Feng, Jin, Zhimeng, Zhao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 30.03.2019; Reed Business Information, Inc. (US)
• Subjects: Algorithms; Analysis; Concrete; Concretes; Four-point bending beam; I–II mixed-mode loading; Mechanical properties; Nuclear energy; Numerical analysis; Random aggregate model; China; I–II mixed-mode loading; Concrete; Random aggregate model; Four-point bending beam
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2018.12.195

•The random generation and distribution of aggregate gradation, location and shape in concrete beam were realized.•The size of the specimen has influence on the peak load value in I–II mixed-mode fracture behavior of concrete.•The propagation path has no obvious relation with the content of the aggregate, and closely related with the loading pattern in concrete. The fracture and damage behaviors of concrete under I–II mixed-mode loading are of great importance in determining the failure mode of concrete material and structure. In this paper, the four-point bending beams with different aggregate volume contents have been fabricated and tested to obtain the limited loading capacities, and the Digital Image Correlation (DIC) method was utilized for monitoring the local displacement above the notch during the loading procedure. Furthermore, based on the aggregate occupation and translation algorithm, a modified random aggregate model has been proposed for generating the four-point bending beam with precast notch, and the numerical simulations for the four-point bending beam with different aggregate volume contents and depths have been proceed.