论文信息 - DAMAGE EVALUATION OF PRESTRESSED CONCRETE-PILES BY ACOUSTIC EMISSION

DAMAGE EVALUATION OF PRESTRESSED CONCRETE-PILES BY ACOUSTIC EMISSION

A fundamental study on fracture mechanisms of concrete-piles under both cyclic and monotonic loadings is performed by using acoustic emission techniques. Full-scale prestressed high-strength concrete piles are subjected to bending and shear loadings. Growth of cracks is monitored by AE, and three-dimensional AE source location is conducted together with identification of crack. These results are compared with results of the pile integrity tests (PIT) and visual observation. It leads to the conclusion that damage inspection by AE is more effective than by PIT in the case where open cracks due to loading would close under unloading. The crack widths evaluated by AE were remarkably compatible to the results of the wave velocity test.

[1] Masayasu Ohtsu,et al. Acoustic emission diagnosis of concrete-piles damaged by earthquakes , 1997 .

[2] Fritz Leonhardt,et al. Vorlesungen über Massivbau , 1973 .

[3] Masayasu Ohtsu,et al. Simplified moment tensor analysis and unified decomposition of acoustic emission source: Application to in situ hydrofracturing test , 1991 .

[4] Masayasu Ohtsu. HISTORY AND DEVELOPMENTS OF ACOUSTIC EMISSION IN CONCRETE ENGINEERING , 1994 .

[5] Yukihiro Tsukada,et al. APPLICATION OF INTEGRITY TESTS FOR QUALITY CONTROL OF CAST-IN-SITU PILES , 1998 .

[6] Masayasu Ohtsu,et al. Cracking process evaluation in reinforced concrete by moment tensor analysis of acoustic emission , 1995 .

[7] Masayasu Ohtsu,et al. A proposed standard for evaluating structural integrity of reinforced concrete beams by acoustic emission , 1999 .

[8] M. J. Randall,et al. The compensated linear‐vector dipole: A possible mechanism for deep earthquakes , 1970 .

[9] 大津政康. Rate process analysis of acoustic emission activity in core test of concrete. , 1992 .

[10] S. Yuyama. Acoustic Emission Generated in Corners of Reinforced Concrete Rigid Frame Under Cyclic Loading , 1994 .

[11] Masayasu Ohtsu,et al. Quantitative evaluation and visualization of cracking process in reinforced concrete by a moment tensor analysis of acoustic emission , 1995 .