Damage progression in RC beam‐column joints under cyclic loading using acoustic emission technique

2021 ◽  
Author(s):  
Shamsher Singh ◽  
Shruti Sharma ◽  
Naveen Kwatra
Keyword(s):  
Acoustic Emission ◽  
Cyclic Loading ◽  
Rc Beam ◽  
Acoustic Emission Technique ◽  
Damage Progression

Resistance to cracking of concrete containing waste rubber aggregates under cyclic loading using the acoustic emission technique

2021 ◽  
Vol 63 (9) ◽  
pp. 865-871
Author(s):  
Jingwu Bu ◽  
Xudong Chen
Keyword(s):  
Stress Intensity Factor ◽  
Acoustic Emission ◽  
Stress Intensity ◽  
Cyclic Loading ◽  
Intensity Factor ◽  
Crack Length ◽  
Damage Evolution ◽  
Acoustic Emission Technique ◽  
Waste Rubber ◽  
Rubber Aggregates

Abstract Recycling rubber aggregates from used grinded tires is a behavior of environmental protection. By performing cyclic flexural tests, this paper explores the effect of rubber aggregate content on the crack propagation of notched concrete beams containing waste rubber aggregates. The crack mouth opening displacement is tested. The acoustic emission technique is applied to detect the damage in the fracture process zone. The crack propagation is evaluated using the critical value of the mode I stress intensity factor. It was found that the crack length and stress intensity factor decrease with the increasing of rubber aggregates content. The crack length and stress intensity factor at failure under constant cyclic loading are larger than those at corresponding post-peak load level. It was observed that the damage evolution curves under cyclic envelope loading can be divided into three stages: initial-quick-stable stages. And they are S-shaped, quick-stable-accelerated curves under constant cyclic loading. Rubber aggregate reduces the acoustic emission activities in concrete specimens. Accumulations of acoustic emission hits, acoustic emission counts and acoustic emission energy are found in accordance with the damage evolution of concrete beam. The relation between damage and accumulative acoustic emission hits is quantified by fitting experimental data. The fitting curves agree well with test results.

scholarly journals Crack intensity of the damaged RC beam repaired with epoxy injection using acoustic emission technique

2019 ◽  
Vol 615 ◽  
pp. 012100
Author(s):  
M N Soffian Noor ◽  
M N Noorsuhada ◽  
K Nizam ◽  
M M M Ariffaizad ◽  
A R Noorhazlinda
Keyword(s):  
Acoustic Emission ◽  
Rc Beam ◽  
Acoustic Emission Technique

scholarly journals Flexural Characteristics Evaluation for Reinforced Concrete Affected by Steel Corrosion Based on an Acoustic Emission Technique

2019 ◽  
Vol 9 (8) ◽  
pp. 1640 ◽  
Author(s):  
Zhang ◽  
Tan ◽  
Wang ◽  
Cheng ◽  
Yang ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Failure Modes ◽  
Steel Corrosion ◽  
Test Method ◽  
Rc Beam ◽  
Acoustic Emission Technique ◽  
Statistical Parameters ◽  
Dense Distribution ◽  
Ae Signals

The purpose of this research is to utilize a more advanced test method for investigating the effect of steel corrosion on the flexural characteristics of a reinforced concrete (RC) beam on a microscopic cracking level. Firstly, over-reinforced RC beam specimens were prepared and corroded using an electrical accelerated steel corrosion setup in different ratios. Subsequently, bending and acoustic emission (AE) tests were performed on all the specimens to obtain their ultimate flexural loads, failure modes and AE signals. Furthermore, rise time/peak amplitude (R/A), ringing counts/duration (AF) and improved b (Ib) values, as the statistical parameters of AE signals, were calculated for indicating the transformation of RC specimens’ crack modes and failure modes under the effect of steel corrosion. Finally, the locations of AE events were obtained by localization technology and compared with the locations of concrete cracks (cracks map). The results revealed that the ultimate flexural load decreases with steel corrosion. The crack tends to transform from shear- to tensile-type along with the increase of the steel corrosion ratio. The trend of the Ib-value curve can reflect the formation and development of cracks; and the larger the duration of violent fluctuations in the Ib-value curve is, the larger the ultimate flexural load of the RC beam is. The region where the crack is located can be judged by the position where the relatively dense distribution of the AE events is.

Optimizing the Acoustic-Emission Technique for Examining the Strength of Welded Joints

Vestnik MEI ◽  
2017 ◽  
pp. 96-101
Author(s):  
Viktor V. Nosov ◽  
◽  
Alsu R. Yamilova ◽  
Nikolay A. Zelenskiy ◽  
Ilya V. Matviyan ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Welded Joints ◽  
Acoustic Emission Technique

scholarly journals Fatigue Stress-Life Model of RC Beams Based on an Accelerated Fatigue Method

2019 ◽  
Vol 4 (2) ◽  
pp. 16
Author(s):  
Eljufout ◽  
Toutanji ◽  
Al-Qaralleh
Keyword(s):  
Cyclic Loading ◽  
Fatigue Testing ◽  
Three Dimensional ◽  
Rc Beam ◽  
Rc Beams ◽  
Testing Methods ◽  
Load Range ◽  
Fatigue Stress ◽  
Life Model ◽  
Prediction Band

Several standard fatigue testing methods are used to determine the fatigue stress-life prediction model (S-N curve) and the endurance limit of Reinforced Concrete (RC) beams, including the application of constant cyclic tension-tension loads at different stress or strain ranges. The standard fatigue testing methods are time-consuming and expensive to perform, as a large number of specimens is needed to obtain valid results. The purpose of this paper is to examine a fatigue stress-life predication model of RC beams that are developed with an accelerated fatigue approach. This approach is based on the hypothesis of linear accumulative damage of the Palmgren–Miner rule, whereby the applied cyclic load range is linearly increased with respect to the number of cycles until the specimen fails. A three-dimensional RC beam was modeled and validated using ANSYS software. Numerical simulations were performed for the RC beam under linearly increased cyclic loading with different initial loading conditions. A fatigue stress-life model was developed that was based on the analyzed data of three specimens. The accelerated fatigue approach has a higher rate of damage accumulations than the standard testing approach. All of the analyzed specimens failed due to an unstable cracking of concrete. The developed fatigue stress-life model fits the upper 95% prediction band of RC beams that were tested under constant amplitude cyclic loading.

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