Journal Published Online: 14 July 2023
Volume 51, Issue 6

Investigations on the Fracture Properties of the Full-Graded Dam Concrete under Increasing Amplitude Cyclic Loading

CODEN: JTEVAB

Abstract

Cracking of full-graded dam concrete (FGDC) is a significant challenge for high arch dams, and such cracking is a substantial risk of damage and failure in an earthquake. To investigate the fracture properties of FGDC, increasing amplitude cyclic fracture tests were conducted. The results indicate that the failure load of FGDC increases with increasing frequency. The evolution of crack mouth opening displacement at maximum load can be divided into three stages. Acoustic emission (AE) and digital image correlation (DIC) were used to characterize the fracture process. A three-stage characteristic is also noted in the distribution of AE hits, and the transition times are identified by the Akaike information criteria picker. With increasing frequency, the first transition time increases, whereas the second transition time decreases. Furthermore, AE events are classified into four levels according to their absolute energy and localized. DIC is employed to trace the cracking process and reveal its brittle failure characteristic. Finally, it is verified that the b-value can be used to characterize the failure process of FGDC under cyclic fracture tests at different frequencies.

Author Information

Liu, Zhiheng
College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu, China
Chen, Xudong
College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu, China
Meng, Qingxiang
College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu, China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu, China
Guo, Shengshan
China Institute of Water Resources and Hydropower Research, Beijing, China
Pages: 19
Price: $25.00
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Stock #: JTE20230144
ISSN: 0090-3973
DOI: 10.1520/JTE20230144