Some computational aspects of tensile strain localization modelling in concrete

✍ Scribed by Nenad Bićanić; Pankaj

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 77 KB
• Volume: 35
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(90)90242-9

✦ Synopsis

In this paper, the authors present the measurement of the fracture energy Gr of the three-point bend concrete beam in nine sizes by means of the method recommended by Rilem. The experimental result indicates that the concrete fracture energy measured in this way still possesses a size effectiveness. The authors think, in accordance with the conceptions of linear elastic fracture and virtual crack models, that when the crack tips in the microcracking zone in the cracking of concrete is simplified into virtual cracks capable of transmitting the surface force, there still exist certain amounts of strength factors around the tip zone of the virtual cracks. Thus the sum energy consumed in the cracking of the concrete cracks falls into two: (1) energy consumed in the cracking of the virtual crack surface; (2) energy released in the cracking of the virtual crack tips. It shows, having been experimented and calculated, that the sizes of the fracture energy in the three-point bend beam are mainly influenced by the amounts of the energy released from the virtual crack tips. If this energy is subtracted on the face of the virtual cracks in the material is, in general, not related to the sizes of the test specimen.