Size-independent fracture energy in plain concrete beams using tri-linear model

作者：Muralidhara S^*; Prasad B K Raghu; Karihaloo B L; Singh R K

来源：Construction and Building Materials, 2011, 25(7): 3051-3058.

DOI：10.1016/j.conbuildmat.2011.01.003

• Local fracture energy
• Tr-linear model
• Fictitious boundary
• Size-independent fracture energy
• Concrete

The boundary effect or the size effect on the fracture properties of concrete has been studied assuming a bi-linear model for the distribution of local fracture energy concept. Boundary effect is observed not only near the back boundary but also near the notch tip, where a fictitious boundary seems to exist, separating the linear and non-linear fracture zones. In this paper a tri-linear function is assumed for the local fracture energy distribution along the ligament and expressions relating RILEM fracture energy and the size-independent fracture energy are developed. Transition ligament length measurements based on the acoustic emission (AE) histogram of events are used to obtain size-independent fracture energy. Length of the fracture process zone is identified in the AE histogram and compared with the value obtained from softening beam model. There seems to be a good agreement between the results.

• 出版日期2011-7