Elastic dynamic characteristics of reinforced concrete bridge deck
To address the problem of non-destructive testing and the interference between voids and rebar wave fields in semi-infinite reinforced concrete structures,a low-frequency ultrasonic quantitative non-destructive tes-ting method based on comb-shaped detection points and omnidirectional feature analysis is proposed.Firstly,an infinite element artificial boundary is introduced to explore the influence of boundary size on the attenuation of pulse signals.Then the omnidirectional wave field characteristics of low-frequency ultrasonic waves in the steel-concrete structure are extracted,and the cavity position and size are determined by the characteristic reflection duration.The results show that the proposed method can effectively reduce the adverse effects of boundary re-flection wave fields,reduce noise levels,and facilitate the wave field feature analysis of time-domain signals.The determination errors for the cavity position and size in the cavity reinforced concrete plate are 0.75%and 2.0%,respectively,indicating that this method can not only eliminate signal blind spots in the stacking of structural materials and defects but also avoid the inconvenience of exciting oblique incident sources in special cases,achieving efficient and accurate defect detection.
国家科技期刊平台
NSTL
万方数据
维普
