US 12,422,410 B2
Structure evaluation system, structure evaluation apparatus, and structure evaluation method
Yuki Ueda, Kawasaki (JP); Hidefumi Takamine, Shinagawa (JP); Kazuo Watabe, Yokohama (JP); and Tomoki Shiotani, Kyoto (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP); and Kyoto University, Kyoto (JP)
Filed by Kabushiki Kaisha Toshiba, Tokyo (JP); and Kyoto University, Kyoto (JP)
Filed on Sep. 3, 2021, as Appl. No. 17/466,260.
Application 17/466,260 is a continuation of application No. PCT/JP2019/049607, filed on Dec. 18, 2019.
Prior Publication US 2021/0396715 A1, Dec. 23, 2021
Int. Cl. G01N 29/12 (2006.01); G01N 29/14 (2006.01)
CPC G01N 29/14 (2013.01) [G01N 29/12 (2013.01); G01N 2291/0234 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A structure evaluation system comprising:
a plurality of sensors configured to detect elastic waves generated in prestressed concrete in which a prestressed concrete steel material is internally provided;
an evaluator configured to evaluate a breakage of the steel material on the basis of elastic waves detected for a second period, which is a period after a first period has elapsed from a point in time when a magnitude of the elastic waves detected by the plurality of sensors is greater than or equal to a threshold value; and
a position locator configured to locate a position of an elastic wave source using a plurality of elastic waves detected for the second period in each of the plurality of sensors,
wherein the evaluator is further configured to:
acquire elastic waves detected during the second period and not acquire elastic waves detected during the first period;
evaluate a breakage of the steel material based on the acquired elastic waves detected during the second period; and
determine that breakage of the steel material has occurred when there are a plurality of elastic wave sources within a given range in an evaluation target area from a position locating result of the position locator,
wherein the first period is 7 ms to 9 ms, and
wherein the second period is 10 ms to 100 s.