Abstract
AbstractIn this study, mechanical loading tests and acoustic emission (AE) monitoring were conducted for reinforced concrete pipe segments, and the AE response of the whole process of segment failure is explored. The results of test show that the AE signal is correlated with the change of load, and the accumulated ringing count of AE signal can effectively characterize the failure characteristics of reinforced concrete pipe segments. Based on the energy and cumulative ringing count of AE signals, the damage process of the pipe segment under load is divided into four stages: in the compaction stage, the AE energy and cumulative ringing count are small; in the linear elastic stage, the AE energy and cumulative ringing count increase steadily; in the crack extension stage, the AE cumulative ringing count increases suddenly when the load fluctuates; in the residual strength stage, the growth rate of AE energy and cumulative ringing count decreases. The full-scale pipes and segment specimens have the same variation trend of load curve and spectrum range of AE signal. Therefore, the segment mechanical loading test can be used as an effective method to study the local loading stress distribution of full-scale pipe.KeywordsReinforced concrete pipe segmentMechanical loadingAcoustic emissionTime–frequency analysis
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