導電塗料を用いたPC桁の曲げひび割れ検知システム

摘要

本稿では，導電塗料を用いてPC桁のひび割れを検知するモニタリングシステムについて，開発·実用化に向けた検討を行った。以下に得られた結果を示す。(1)導電塗料により，ひび割れを検知する検知部と検知しない通電部を組み合わせて回路を構築することで，ひび割れ位置を特定できる手法を考案した。%The prestressed concrete beams has a possibility of bending cracks on the bottom surface of the girder due to the breakage or deterioration of pc steel material caused by poor grout filling; etc. we are investigating a crack detection method using conductive paint for the purpose of detecting the bending cracks and specifying the location where they occur. in this paper; we report that confirmed the crack detection performance of the conductive circuit by the load test. in addition; we performed design calculations that reproduced the stress state at the time of application for the existing pc girder; grasped the residual strength of the pc girder when bending cracks occurred; and then constructed a monitoring system using conductive paint to the actual structure.