Nondestructive Assessment of Reinforced Concrete Structures Based on Fractal Damage Characteristic Factors

Cao, Maosen; Ren, Qingwen; Qiao, Pizhong

doi:10.1061/(asce)0733-9399(2006)132:9(924)

Cited by 51 publications

(26 citation statements)

References 21 publications

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“…Carrillo et al proposed a damage index (DI) and also performance level assessment method based on fractal dimension. The average carbonized depth and residual material intensity are conventional damage characteristic factors for reinforced concrete structures; Cao et al noticed that fractal damage factors have a linear correlation with the aforementioned conventional factors, and also monofractal and multifractal dimensions are indicators of damage in concentrated‐load space and even‐load space, respectively. Several studies showed that fractal dimension and multifractal dimensions are suitable parameters for damage classification and relative stiffness loss estimation of RCSWs …”

Section: Introductionmentioning

confidence: 99%

Strength and stiffness estimation of damaged reinforced concrete shear walls using crack patterns

Madani

Dolatshahi

2020

Struct Control Health Monit

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Summary The purpose of this paper is to estimate the stiffness and strength of damaged rectangular reinforced concrete shear walls after an earthquake using surface crack patterns. Assessing the damage severity of buildings after an earthquake is an important part of the emergency inspection operation of buildings. Expert inspectors tag buildings into two categories of safe or unsafe that are usually affected by subjective decisions, which may result in catastrophic events reported in previous earthquakes. In this research, an extensive database on the images of damaged rectangular reinforced concrete shear walls (RCSWs) is collected and used to develop predictive equations for updated stiffness and strength of damaged walls. Based on the crack patterns extracted from images of the shear walls in different loading states, empirical relationships for predicting reserved strength and stiffness of damaged RCSWs are proposed. These equations are developed based on the fractal quantities of surface crack patterns and structural data for various possible scenarios using symbolic and Bayesian regression. Finally, a damage index is proposed based on the crack pattern of RCSWs that can be used for automated post‐earthquake evaluation of buildings.

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Section: Introductionmentioning

confidence: 99%

Strength and stiffness estimation of damaged reinforced concrete shear walls using crack patterns

Madani

Dolatshahi

2020

Struct Control Health Monit

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“…Practically, only when the above criteria are met for q over a limited but relatively wide interval, can the f ðαÞ -α curve be regarded as the multifractal singular spectrum [19]. As shown in Fig.…”

Section: Experiments Results and Discussionmentioning

confidence: 99%

Multifractal characteristics of cylindrical sludge drying

Wang

2009

Front. Environ. Sci. Eng. China

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This paper analyzes dewatered sludge drying using the multifractal theory. The drying rates of cylindrical sludge with equal masses but different crosssectional diameters was studied, from which multifractal parameters such as partition function and quality exponent were obtained. The parameters acquired were used to calculate the multifractal singularity spectrum and indicate the presence of multifractal characteristics. The smaller cross-sectional diameters of the sludge were found to be non-homogeneous, and required quantitative methods to analyze.

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“…The main advantage of such methods is that they do not require a great number of transducers to be located in close proximity to defects. Most commonly used and promising global methods of nondestructive testing are vibration approaches [8]. They are based on the fact that the variations of physical properties (mass, rigidity, damping) of an object cause the changes in modal parameters, which qualitatively and quantitatively characterize natural vibrations.…”

Section: Introductionmentioning

confidence: 99%

Process of cracking in reinforced concrete beams (simulation and experiment)

Шардаков¹,

Shestakov²,

Glot³

et al. 2016

Frattura Ed Integrità Strutturale

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The paper presents the results of experimental and theoretical investigations of the mechanisms of crack formation in reinforced concrete beams subjected to quasi-static bending. The boundary-value problem has been formulated in the framework of brittle fracture mechanics and solved using the finite-element method. Numerical simulation of the vibrations of an uncracked beam and a beam with cracks of different size serves to determine the pattern of changes in the spectrum of eigenfrequencies observed during crack evolution. A series of sequential quasi-static 4-point bend tests leading to the formation of cracks in a reinforced concrete beam were performed. At each loading step, the beam was subjected to an impulse load to induce vibrations. Two stages of cracking were detected. During the first stage the nonconservative process of deformation begins to develope, but has not visible signs. The second stage is an active cracking, which is marked by a sharp change in eingenfrequencies. The boundary of a transition from one stage to another is well registered. The vibration behavior was examined for the ordinary concrete beams and the beams strengthened with a carbon-fiber polymer. The obtained results show that the vibrodiagnostic approach is an effective tool for monitoring crack formation and assessing the quality of measures aimed at strengthening concrete structures.

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Nondestructive Assessment of Reinforced Concrete Structures Based on Fractal Damage Characteristic Factors

Cited by 51 publications

References 21 publications

Strength and stiffness estimation of damaged reinforced concrete shear walls using crack patterns

Strength and stiffness estimation of damaged reinforced concrete shear walls using crack patterns

Multifractal characteristics of cylindrical sludge drying

Process of cracking in reinforced concrete beams (simulation and experiment)

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