AE energy analysis on concrete bridge beams

Colombo, Silvia; Forde, M. C.; Main, Ian; Halliday, J.; Shigeishi, Mitsuhiro

doi:10.1007/bf02481658

Cited by 34 publications

(13 citation statements)

References 2 publications

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“…Relaxation ratio is defined as the ratio of the average AE energy during unloading phase to the average AE energy during loading phase. Considering that AE activity during the unloading process is generally an indication of structural instability [9], a relaxation ratio greater than one (relaxation dominant) implies a defective structure. A new index called the 'RTRI ratio' (ratio of Repeated Train load at the onset of AE activity to Relative maximum load for Inspection period) was proposed by Shiotani and coworkers [11,12] to overcome the difficulty to estimate the maximum load that has been ever experienced by existing structures.…”

Section: Intensity Analysismentioning

confidence: 99%

Evaluation of deterioration in reinforced concrete structures by AE technique

Proverbio

2010

Materials & Corrosion

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Acoustic emission (AE) technique is gaining increasing interest for applications in civil engineering. AE indeed is a passive nonintrusive technique that can be applicable either in structural health monitoring (global evaluation) and in defect localization (local evaluation). The most promising application of such a technique seems to be however in the evaluation of growing defects. Defects such as cracks and delamination can be caused by reinforcement corrosion as well as by other concrete deterioration mechanisms (alkali silica reaction, sulphate attack, etc.) as well as originating from improper concrete casting, curing or structure setting. Damage severity can be evaluated by means of the intensity analysis (IA) through the use of different indexes such as ‘Load Ratio’, ‘Calm Ratio’, ‘Felicity Ratio’ or ‘Historical Index’. Damage evolution analysis along time could be however significantly improved by adopting some procedure already used in the field of geophysics and earth science. Among various parameters, the most significant one is the b‐value which is derived from the amplitude distribution data of AE following the methods used in seismology. Several application examples applied to prestressed concrete structures are reported in the paper.

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Section: Intensity Analysismentioning

confidence: 99%

Evaluation of deterioration in reinforced concrete structures by AE technique

Proverbio

2010

Materials & Corrosion

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“…AE energy is an AE parameter useful to assess damage in concrete structures and researchers used to evaluate the damage in RC beams through laboratory investigations [17,18]. By utilizing the parameter 'relaxation ratio', Colombo et al [18] concluded that there is a change in relaxation ratio at 45% of the ultimate failure load in concrete bridge beams [3].…”

Section: Ae Energy Analysismentioning

confidence: 99%

Kaiser effect observation in reinforced concrete structures and its use for damage assessment

Sagar

Prasad

Singh

2015

Archives of Civil and Mechanical Engineering

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“…For example, 0.9 load ratio and 0.05 calm ratio were suggested for the classification in laboratory tests of 3 m-span reinforced concrete beams [15]. For a concrete bridge beams, 0.3-0.45 load ratio and 0.6 calm ratio were applied [17,18]. Recently, for shorter beams than 1 m, 0.4-0.5 load ratio and 1.0 calm ratio were applied [19].…”

Section: Load Ratio and Calm Ratiomentioning

confidence: 99%