Quantitative analysis of fracture process in RC column foundation by moment tensor analysis of acoustic emission

Classification of cracking mode in concrete by acoustic emission parameters

“…A very important aspect is the correlation of AE indices to the cracking mode. For most cases of materials and loadings until failure, tensile cracks are developed at the initial stage of loading, while shear cracks dominate later (Yuyama et al, 1999). This is typical for reinforced concrete members that undergo bending.…”

AE Monitoring for Damage Assessment of RC Exterior Beam-column Subassemblages Subjected to Cyclic Loading

“…Diagnosis and monitoring techniques are acquiring an increasingly important role in the assessment of structural health and reliability, and one of their main fields of application is structural damage diagnosis in reinforced concrete (RC) structures [1][2][3][4][5]. One considerable source of damage in RC frames when they are located in earthquake-prone areas is cyclic loading induced by ground acceleration during seismic events.…”

Application of a moment tensor inversion code developed for mining-induced seismicity to fracture monitoring of civil engineering materials

“…Qualitative techniques such as b-value analysis based on Gutenberg and Richter's original work (Gutenberg and Richter, 1949) have been paid particular attention to because they are relatively straightforward to implement (Carpinteri et al, 2009;Colombo et al, 2003;Kurz et al, 2006;Schumacher et al, 2011;Shiotani et al, 2000). Quantitative seismology techniques such as moment tensor inversion (MTI) are still being evaluated in the laboratory (Finck et al, 2003;Katsaga et al, 2007;Köppel, 2002;Ohtsu, 1991;Yuyama et al, 1999). For both approaches, the aim is to develop real-time tools to monitor fracture processes and assess the health of in-service structural concrete members such as bridge girders.…”

“…Köppel used the same code to characterise sources from his own pull-out tests as well as from a large-scale prestressed bridge girder test (Köppel and Grosse, 2000;Köppel and Vogel, 2000). Yuyama et al (1999) applied MTI extensively to study the fracture mechanics of concrete beams strengthened with fibre reinforced polymer (FRP) sheets and reinforced concrete column foundations. The largest tests do date using MTI were performed by Katsaga et al (2007) on deep reinforced concrete beams where the researchers made useful observations regarding the evolution of the ratio of tensile to shear-type events as failure of the specimen was approaching.…”