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عنوان فارسی مقاله:
سیستم درجه بندی آسیب برای ارزیابی شدت در ساختار بتن
عنوان انگلیسی مقاله:
Damage grading system for severity assessment on concrete structure
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Currently, the acoustic emission (AE) technique has been widely utilized in concrete structures for damage detection and monitoring systems.This technique is unique as it can furnish the internal and external behaviour of material properties and structural conditions under various structural loads [1]. This investigation has been implemented and established by previous research mainly in the evaluation of concrete structure. However, further research is also needed for new evolutions of the AE system in assessing concrete structures. Technically, much remains to be explored about AE. This was proven by previous research which highlighted new developments of the evaluation system [2–6]. The AE damage detection of concrete structures has been analyzed by data parameters in AE signal. The AE signal was produced and recorded from transducers during the testing process. The parameters recorded in the AE win software are count, hit, amplitude, frequency, signal strength, absolute energy and energy. Each of them represented the characteristic of AE signal as documented by the Physical Acoustic Corporation (PAC) and the American standard [7]. In the evaluation system, more methods were used to analyze the signal waveforms in concrete structures. The Moment Tensor Analysis (MTA) was used to define the type of cracking process and it involved amplitude and average frequency parameters [8,9]. Parameter based analysis such as calm ratio and load ratio were used to indicate the damage level under hit and load data parameters [3,10]. In addition, the applications of b-Value and RA value analysis were also used to detect and classify the types of cracking such as macro and micro cracking as well as tensile and shear cracking [8–11]. Besides that, intensity analysis (IA) was also used to classify the damage level of concrete structures and the main parameter used in this method is signal strength [12–16]. This research paper emphasizes on the use of IA for damage classification. The main parameter which is used in this method is absolute (ABS) Energy. ABS energy has been used in the past on concrete structures for damage detection and crack locations [14]. The detailed implementations of this data parameter require more research work, especially in terms of damage grading system. Therefore, this paper focuses on the ABS energy parameter and the IA method to develop damage classifications on concrete structure.
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کلمات کلیدی:
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