FIELD: measurement technology.
SUBSTANCE: invention relates to measurement of stresses in operating reinforcement of operated reinforced concrete structure and can be used for control of its safety. Confirmation of actuality of proposal for determination of two components of stressed state of cut reinforcement rod is mutual displacement of rod ends at its cutting point in two mutually perpendicular planes coinciding with direction of action of bending and torsion moments. Substance is cut in concrete; inside the fins the exposed reinforcement rod section is bare; on the level of its axis, on the level of its axis, on the section cleaned from the concrete, there installed are two sensors of linear deformation: one from above (in vertical plane), the other – from the side (in horizontal plane); initial (zero) deformation value is measured on both sensors; cutting the reinforcement rod outside the sensors installation; measuring the strain of the unloaded reinforcement rod on both sensors; according to Hooke's law, operating in the fixture prior to cross-section of stress is determined, wherein according to the readings of the sensor mounted from above, calculating voltage σbend, caused by bending moment Mbend, based on the side mounted sensor readings, voltages are calculated σbend+tor, caused by joint action of bending moment Mbend and torque Mtor, as per difference of readings of sensors installed sideways and from above, calculating voltage σtor, caused by torque action Mtor; after measurement, the cut section of the reinforcement rod is restored, the exposed section of the reinforcement rod is concreted.
EFFECT: determining stress components in working rod accessories located in compressed and stretched zones of reinforced concrete structures of the operated structure caused by bending and torsion moments.
1 cl, 6 dwg
