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After the great
Hanshin earthquake, numerous studies have been made to evaluate damage
levels, toughness and deformation characteristics of reinforced concrete (RC)
columns exposed to the earthquake shock. In the present study, RC columns are
subjected to simulated seismic lateral loading under different axial loads.
Acoustic emission (AE) is monitored to characterize the seismic behavior of
column foundation. AE is shown to be very sensitive to detect cracks
generated in the foundation. An AE moment tensor analysis is applied to
analyze the fracture process quantitatively. Experimental results demonstrate
different fracture behavior, depending on the different axial loads. It is
also shown that the moment tensor analysis is very useful for quantitative
evaluation of the fracture process.
(Joint
research with Sato Kogyo Co., Ltd.)
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