抄録
Credited to rapid development of Computed tomography (CT) technology,
human’s vision ability has been greatly extended to acquire clear
interior imaging in many fields such as detection of interior
structure of manufactures nondestructively like bridges. Since more
and more bridges built several decades ago in Japan have become aged
to be maintained for a satisfactory safety situation, the
non-destructive evaluation of aging bridges is really an urgent
problem. Since the law of Japanese radiation protection permits use of
linacs up to 4MeV outside radiation controlled area, CT system with
portable 3.95MeV linacs for bridge inspection is considered to work
on-site. The system would reconstruct 3D model built from sectional
imaging to evaluate load-bearing performance by confirming the
internal steel situation of bridges and analyzing structural strain
and stress. The reconstruction process of bridge imaging is based on
partial scanned data because bridge shape confines possible scanning
angle to smaller than 180° and a few translations. Large concrete
sample with internal steel bars is scanned in laboratory as
preliminary work.
