Identification of the structural damage mechanism of BFRP bars reinforced concrete beams using smart transducers based on time reversal method

2019 ◽  
Vol 220 ◽  
pp. 615-627 ◽  
Author(s):  
Lingzhu Zhou ◽  
Yu Zheng ◽  
Gangbing Song ◽  
Dongdong Chen ◽  
Yuxiao Ye
Keyword(s):  
Reinforced Concrete ◽  
Time Reversal ◽  
Structural Damage ◽  
Concrete Beams ◽  
Damage Mechanism ◽  
Reinforced Concrete Beams

scholarly journals Assessing the Damage Mechanism in Reinforced Concrete Beams under Repetitive Low Velocity Impact Loading

2021 ◽  
Vol 9 (VI) ◽  
pp. 4412-4418
Author(s):  
Sajina K
Keyword(s):  
Reinforced Concrete ◽  
Impact Loading ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Damage Mechanism ◽  
Reinforced Concrete Beams ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Finite Elements Analysis ◽  
Ice Impacts

Reinforced concrete beams are widely used in various civil structures such as residential, industrial, and commercial buildings. The use of RC beams reduces the cost of the construction and the time of execution. Rockfalls, accidental events, explosions, projectile, missile or aircraft impacts, terrorist attacks and ice impacts are the typical examples of sudden loads. Experimental studies can be impractical and require expensive devices to observe crack pattern and failure due to impact loading. Similar results can be obtained through non-linear finite elements analysis. In this study, RC beam is modelled and analyzed for changing impact velocity. Beam properties like clear cover is varied to access the damage in beams.

Strain Mode Damage Detection in Reinforced Concrete Beams Application

2012 ◽  
Vol 446-449 ◽  
pp. 566-571
Author(s):  
Jia Quan Wu ◽  
Ji Yao ◽  
Hong Yan Li ◽  
Liang Cao ◽  
Kun Ma
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Damage Detection ◽  
Structural Damage ◽  
Concrete Beams ◽  
Element Model ◽  
Reinforced Concrete Beams ◽  
Strain Mode ◽  
Finite Element Software ◽  
Injury Models

This paper describes the strain mode damage detection theory and a three-dimensional reinforced concrete beams finite element model was built by finite element software. The different degree injury models tests were compared. Experiment’s results show that the first four natural frequencies of different degree injury models are small differences while the corresponding strain modes have a significant changed in damage location. The structure of the strain mode changes are still evident when structural damage occurred in the strain mode node.

Research Status of Fatigue Damage Mechanism of Reinforced Concrete Beam

2016 ◽  
Vol 858 ◽  
pp. 44-49 ◽  
Author(s):  
Hong Yu Zhou ◽  
Yi Bo Chen ◽  
Jun Chang Ci ◽  
Cong Kun Yang
Keyword(s):  
Reinforced Concrete ◽  
Fatigue Damage ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Damage Mechanism ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Research Progress ◽  
Fatigue Properties ◽  
Shear Fatigue

Based on the fatigue damage mechanism, fatigue life, stiffness degradation, crack width change, bending, shear fatigue properties and other aspects, this paper introduces the research progress of the fatigue properties of ordinary reinforced concrete beams. And the existing reinforced concrete beam flexural, shear fatigue properties of research ideas, methods and results are summarized, providing the basis for further study on the fatigue performance of reinforced concrete beams. At present, the research results show that the fatigue damage of reinforced concrete beam is basically in accordance with the law of the three stages. In the early stage of fatigue, the tensile concrete cracks and exits, and the damage develops rapidly. In the middle of fatigue crack growth, fatigue damage is developed into a more moderate linear growth. In the late stage of fatigue, fatigue fracture occurs in the steel bar, and the bearing capacity of the beam is quickly lost.

scholarly journals Experimental Study on the Relationship between the Natural Frequency and the Corrosion in Reinforced Concrete Beams

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Liye Zhang ◽  
Limin Sun ◽  
Lijuan Dong
Keyword(s):  
Reinforced Concrete ◽  
Natural Frequency ◽  
Structural Damage ◽  
Concrete Beams ◽  
Polynomial Model ◽  
Reinforced Concrete Beams ◽  
Frequency Change ◽  
Corrosion Depth ◽  
The Relationship ◽  
Corrosion Time

Due to many nondamage factors such as temperature, humidity, carbonation, and corrosion effects on natural frequency, the key problem of the application frequency-based method to detect damage is to reveal the rules of these factors affect natural frequency and further to eliminate their effects. The long-term characteristics of reinforced concrete structures require a lot of attention, especially in corrosive environment. In this paper, an experimental investigation was conducted to study the deflection and natural frequency of reinforced concrete beam in a marine environmental chamber for six corrosion stages (accelerated corrosion for 0, 20, 40, 70, 100, and 140 days). The experimental results demonstrated that deflection increases with corrosion time, while natural frequency decreases with corrosion time. Based on the accelerate corrosion test data of reinforced concrete beams, the general expression of the relationship between corrosion depth and natural frequency has been established through the fitting curve method. The polynomial model has been selected for establishing the relationship between steel corrosion depth (including the main reinforcement and stirrup) and natural frequency. The reason for selecting the polynomial model is that the sum of squares due to error (SSE) is closer to 0 and the coefficient of multiple determination (R-square) is closer to 1. This investigations help to discriminate the cause of reinforced concrete beams natural frequency change, to eliminate nondamage factors affects, and to apply many structural damage identification methods effectively.

scholarly journals Analysis of the microcracking process with the Acoustic Emission method with respect to the service life of reinforced concrete structures with the example of the RC beams

2015 ◽  
Vol 63 (1) ◽  
pp. 55-63 ◽  
Author(s):  
B. Goszczyńska ◽  
G. Świt ◽  
W. Trąmpczyński
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Structural Damage ◽  
Crack Width ◽  
Crack Formation ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Rc Beams ◽  
Acoustic Emission Method ◽  
Emission Method

Abstract The study presents the analysis of the process of crack formation and crack width growth in statically determinate and hyperstatic reinforced concrete beams with the IADP acoustic emission method. The beams were subjected to the monotonic, variable with unloading, and variable cyclic loading schemes. The criteria of structural damage were established to account for the structure durability

Damage Detection of Reinforced Concrete Beams by Wavelet Analysis

2012 ◽  
Vol 166-169 ◽  
pp. 1416-1421 ◽  
Author(s):  
Gang Xue
Keyword(s):  
Reinforced Concrete ◽  
Structural Damage ◽  
Concrete Beams ◽  
Processing System ◽  
Reinforced Concrete Beams ◽  
Dynamic Monitoring ◽  
Load Step ◽  
Structural Dynamic ◽  
Multi Scale ◽  
Response Expression

Simple-supported reinforced concrete (R.C) beams are subjected to an increasing static load in the middle to introduce cracks, and the last load step corresponds to failure. After each load step and unloading, an experimental dynamic monitoring is performed. Multiple degree freedom dynamic equation of the test beams is wavelet transformed, and structural dynamic response expression on multi-scale is acquired. It’s shown that multi-scale decomposition of signal comprises more structural damage information. By means of DASP signal processing system, binary wavelet transformation is applied to dynamic signal of reinforced concrete beams on different damage state. Through analyzing wave-figure of all frequency scales, the damage of reinforced concrete beams is detected.

scholarly journals Initial crack effect on the strength of oblique cross sections of reinforced concrete beams strengthened with carbon fiber

2019 ◽  
Vol 110 ◽  
pp. 01053
Author(s):  
Alexandr Shilov ◽  
Petr Polskoy ◽  
Dmitriy Mailyan ◽  
Petr Shilov
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Cross Sections ◽  
Structural Damage ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Reinforced Concrete Beams ◽  
Shear Span ◽  
The Impact ◽  
Initial Cracks

In the theory of reinforced concrete, the issue on strength of the oblique beam sections is more complicated than that on the standard sections, since it depends on many factors. The change of at least one of them leads to a significant change in the carrying capacity and in the structural damage pattern. This is due to the fact that at the operating level of the load, all conventional reinforced concrete structures work with cracks, which must be considered in the calculation. However, in the existing regulatory documents and public sources, this issue is not specified. This paper considers the effect of initial cracks on the strength of oblique cross sections of the reinforced concrete beams strengthened with carbon fiber. The experimental studies results obtained through the transverse force testing of forty-two prototypes made of heavy concrete of B30 design grade are presented. The test samples had initial oblique cracks of 0.6-0.9 mm width and were reinforced with three composite U stirrups from the fabric based on unidirectional carbon fibers in the shear span. Initial cracks in the beams were formed at three values of the shear span – 1.5h0, 2h0 and 2.5h0. The test data show the impact of initial cracks on the efficiency of composite reinforcement of oblique cross sections of the prototypes at various values of shear spans.

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