AE法を適用したコンクリートの曲げ破壊の追跡に関する実験的研究

Abstract

In this study, the acoustic emission method was applied to trace the fracture process of plain concrete and steel fiber reinforced concrete subjected to bending moment. The relationships between the fracture mechanics parameters, such as parameters in the bi-linear tension softening model, and the crack propagation behavior were discussed. Following results were obtained in this study : 1) In the case of concrete beam having notch, the release of fracture energy is concentrated at the tip of notch, but is dispersed into the whole of maximum bending moment region, in the case of concrete beam having no notch. 2) The cracking zone of steel fiber reinforced concrete is disposed to spread in the whole specimen than that of plain concrete, because the cracking is arrested by the steel fiber. 3) The crack propagation behaviors are closely related to the first slope in the bi-linear tension softening model estimated from the load (P) - displacement (d) relationship.