The invention relates to a
system for detecting the tensioning force of a vertical presstressed reinforcing steel of a concrete
box girder bridge web plate, which comprises a reinforced bar, a corrugated sleeve and nuts, wherein the lower part of the reinforced bar is vertically embedded into the concrete
box girder bridge web plate and stretched into the vertical presstressed reinforcing steel; the upper part of the vertical presstressed reinforcing steel is provided with an exposed section; the exposed section is provided with an acceleration
transducer and an
exciter and electrically connected with a
data acquisition unit, a notebook computer and a power supply; a
signal analysis device which is used for being connected with the
data acquisition unit is arranged and operated inside the notebook computer; the
exciter obtains a command of the notebook computer to make the exposed section of the vertical
tendon vibrate, converts the vibration into the
natural frequency of the exposed section of the vertical presstressed reinforcing steel through the
signal analysis device, and acquires the tensioning force between two nuts of the vertical presstressed reinforcing steel by application of a calculation relational expression. The detection
system overcomes the defect that the prior
system for detecting the tensioning force of the vertical presstressed reinforcing steel of a concrete
box girder bridge can not meet the demand of on-scene large-area detection of the quality of the tensioning force of the vertical presstressed reinforcing steel, and is suitable for detecting the vertical presstressed reinforcing steel of the large-span
prestressed concrete box
girder bridge web plate.