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Abstract
Rebar as the core vertical prestressing stressing member of the bridge structure. The stress loss can not be effectively controlled during the whole process of anchorage, coupled with the influence of environmental corrosion. The result is that the vertical prestressing force cannot meet the design requirements, seriously threatening the durability and safety of the structure. This paper combines ultrasonic guided wave technology with acoustic elasticity theory to detect the effective prestressing of rebar. Guided wave propagation characteristics and acoustic elasticity effect under different tensile forces after bare rebar and outsourcing mortar are investigated. Tension tests and guided wave propagation tests were carried out on the specimens to analyze the variation rule between the first wave speed of guided waves and the tension force. The results show that the first wave speed of the guided wave decreases with the increase of the excitation frequency, which is consistent with the theoretical frequency dispersion curve. With the gradual increase of the excitation power, the amplitude of the guided waveform received by the rebar increases gradually only in the time and frequency domains. The law between first wave speed and tension after the outsourcing mortar is consistent with that of bare rebar. It is feasible to establish an identification method of prestressing rebar based on acoustoelastic effect.
Published Version
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