Damage and Defects in Fiber-Reinforced Polymer Reinforced and Strengthened Concrete Elements

Malla, Pranit; Dolati, Seyed Saman Khedmatgozar; Ortiz, Jesus D.; Mehrabi, Armin; Nanni, Antonio

doi:10.1061/jccof2.cceng-4132

Cited by 8 publications

(8 citation statements)

References 74 publications

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“…The proposed method has been successfully applied to multiple case studies, including a seven-bar planar truss, a space dome truss structure, and a complex nonlinear truss In the current study, we recognize that due to considerations of computational efficiency and the curse of dimensionality, our model does not directly account for fabrication defects [68] that may occur, such as imperfections in joints or struts. While these defects could significantly impact the structural performance and reliability, at this stage, we have chosen to focus on our current model's core functionalities and efficiency.…”

Section: Discussionmentioning

confidence: 99%

A Metamodel-Based Multi-Scale Reliability Analysis of FRP Truss Structures under Hybrid Uncertainties

Zhao,

Zhou,

2023

Materials

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This study introduces a Radial Basis Function-Genetic Algorithm-Back Propagation-Importance Sampling (RBF-GA-BP-IS) algorithm for the multi-scale reliability analysis of Fiber-Reinforced Polymer (FRP) composite structures. The proposed method integrates the computationally powerful RBF neural network with GA, BP neural network and IS to efficiently calculate inner and outer optimization problems for reliability analysis with hybrid random and interval uncertainties. The investigation profoundly delves into incorporating both random and interval parameters in the reliability appraisal of FRP constructs, ensuring fluctuating parameters within designated boundaries are meticulously accounted for, thus augmenting analytic exactness. In application, the algorithm was subjected to diverse structural evaluations, including a seven-bar planar truss, an architectural space dome truss, and an intricate nonlinear truss bridge. Results demonstrate the algorithm’s exceptional performance in terms of model invocation counts and accurate failure probability estimation. Specifically, within the seven-bar planar truss evaluation, the algorithm exhibited a deviation of 0.08% from the established failure probability benchmark.

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Section: Discussionmentioning

confidence: 99%

A Metamodel-Based Multi-Scale Reliability Analysis of FRP Truss Structures under Hybrid Uncertainties

Zhao,

Zhou,

2023

Materials

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“…The external application of FRP composites to strengthen/repair RC structures involves three materials: internal reinforcement (typically steel rebars, with the potential for future adoption of FRP rebars), and concrete and FRP composites (wet lay-up system), along with the different interfaces. Defects associated with the external application of FRP composites can occur within either of the three materials or at the interface between them [15].…”

Section: Inspection Of Eb-frp Concrete Elementsmentioning

confidence: 99%

“…Breaking down the EB-FRP concrete element into its distinct components enables a focused approach to examine the potential defects and damage that may arise during its service life. Initially, potential damage and defects in EB-FRP concrete elements were categorized based on their likely locations, i.e., where they occur, typically falling into three distinct groups: (1) defects in FRP composites (i.e., FRP composites (F)); (2) bond defects (i.e., FRP-adhesive interface (I-FA), adhesive (A), and adhesive-concrete interface (I-AC); and (3) defects in concrete (i.e., concrete (C) and concrete-steel rebar interface (I-CS)) [15]. In a prior study, the authors classified damage based on its location and initiation time, while also identifying its sources.…”

Section: Location Of Potential Defects or Damagementioning

confidence: 99%

“…In a prior study, the authors classified damage based on its location and initiation time, while also identifying its sources. Figure 2 illustrates the location of the most likely defects in EB-FRP concrete elements [15].…”

Section: Location Of Potential Defects or Damagementioning

confidence: 99%

“…The aging process typically results in the need of repairs in conventional steel-RC structures. Furthermore, structural elements often require strengthening and retrofitting due to design and construction errors, damage from exceptional events or accidental impacts, natural disasters, and functional modifications [15,16].…”

Section: Introduction 1frp Compositesmentioning

confidence: 99%

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Nondestructive Testing (NDT) for Damage Detection in Concrete Elements with Externally Bonded Fiber-Reinforced Polymer

Ortiz,

Dolati,

Malla

et al. 2024

Buildings

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Fiber-reinforced polymer (FRP) composites offer a corrosion-resistant, lightweight, and durable alternative to traditional steel material in concrete structures. However, the lack of established inspection methods for assessing reinforced concrete elements with externally bonded FRP (EB-FRP) composites hinders industry-wide confidence in their adoption. This study addresses this gap by investigating non-destructive testing (NDT) techniques for detecting damage and defects in EB-FRP concrete elements. As such, this study first identified and categorized potential damage in EB-FRP concrete elements considering where and why they occur. The most promising NDT methods for detecting this damage were then analyzed. And lastly, experiments were carried out to assess the feasibility of the selected NDT methods for detecting these defects. The result of this study introduces infrared thermography (IR) as a proper method for identifying defects underneath the FRP system (wet lay-up). The IR was capable of highlighting defects as small as 625 mm2 (1 in.2) whether between layers (debonding) or between the substrate and FRP (delamination). It also indicates the inability of GPR to detect damage below the FRP laminates, while indicating the capability of PAU to detect concrete delamination and qualitatively identify bond damage in the FRP system. The outcome of this research can be used to provide guidance for choosing effective on-site NDT techniques, saving considerable time and cost for inspection. Importantly, this study also paves the way for further innovation in damage detection techniques addressing the current limitations.

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Effect of glass fiber on flexural performance of GFRP-RC beams under sustained loading and alkaline environment: Experimental, numerical and analytical investigations

Yang,

Zhang,

Zhang

et al. 2024

Construction and Building Materials

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Damage and Defects in Fiber-Reinforced Polymer Reinforced and Strengthened Concrete Elements

Cited by 8 publications

References 74 publications

A Metamodel-Based Multi-Scale Reliability Analysis of FRP Truss Structures under Hybrid Uncertainties

A Metamodel-Based Multi-Scale Reliability Analysis of FRP Truss Structures under Hybrid Uncertainties

Nondestructive Testing (NDT) for Damage Detection in Concrete Elements with Externally Bonded Fiber-Reinforced Polymer

Effect of glass fiber on flexural performance of GFRP-RC beams under sustained loading and alkaline environment: Experimental, numerical and analytical investigations

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