| 摘要 |
PROBLEM TO BE SOLVED: To provide a monitoring method for crack growth in an actual steel structure, and a residual life estimation method for the actual steel structure. SOLUTION: A large number of potential difference measuring terminals are preferably arranged on the surface of the actual steel structure in a lattice form to set a potential difference measuring region and potential difference is intermittently or continuously measured with respect to a potential difference measuring terminal pair comprising two terminals among a large number of the potential difference measuring terminals while supplying a current to the potential difference measuring region. An electric field fingerprint FC value is calculated from the obtained potential difference. The relation between the crack growth quantity predetermined using a test body simulating the actual steel structure and the FC value is set as a master curve and the crack growth quantity is monitored from the FC value measured in the actual steel structure using the master curve. Further, the relation between the repeating number of times of charged load up to the limit repeating number of times in the collapse of the test body predetermined using the test body simulating the actual steel structure and the FC value is set as a master curve and the repeating number of times of charged load corresponding to the respective FC values measured by the same measuring terminal pair of the actual steel structure so as to leave a time interval (t) is read from the master curve and used to estimate the residual life of the actual steel structure. COPYRIGHT: (C)2006,JPO&NCIPI
|
