Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate

Calabrese, Angelo Savio; D’Antino, Tommaso; Colombi, Pierluigi; Carloni, Christian; Poggi, Carlo

doi:10.3390/ma13102368

Cited by 16 publications

(9 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Then, we solve Equation (3) in the frictional zone, i.e., with the second row in Equation (29) and boundary conditions (35) and (36), since the stress and the displacement must be continuous at x = la. In this way, we get s[x] for la < x < l. Evaluating its derivative at the loaded end, using Equation (4), we finally get the load for stages (e-g):…”

Section: Dugdale Model (Dm)mentioning

confidence: 99%

See 1 more Smart Citation

Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength

et al. 2021

View full text Add to dashboard Cite

Interfacial debonding in fiber-reinforced composites is a common problem, especially in external strengthening techniques. This investigation aims to determine the load during debonding, and discusses two practical design parameters for direct shear tests, which are commonly used to assess the mechanics of debonding. In this study, three different bond-slip cohesive laws and one finite fracture mechanics approach are considered to investigate debonding in direct shear tests by taking the effect of residual strength into account. For each model, load during debonding and its maximum value are given by closed-form expressions, which are then checked against experimental data reported in the literature. It is shown that using the interfacial mechanical properties extracted from one geometry, the debonding load of tests with different bond lengths and widths can be predicted without any fitting procedure. Moreover, effective bond length formulae are suggested for each model; one is the straightforward extension (accounting for residual strength) of a formula available in the Standards. The results illustrate the importance of considering residual strength in direct shear tests, even at debonding onset, with its effect being nonetheless higher for long bond lengths.

show abstract

Section: Dugdale Model (Dm)mentioning

confidence: 99%

“…Recently, a modified double-pull shear setup was introduced by Mukhtar and Shehadah [35] to determine the bond performance of FRP-to-concrete joints. It is worthwhile to note that, recently, the fatigue performance of FRCM composites has been receiving a lot of attention [36,37].…”

Section: Introductionmentioning

confidence: 99%

Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength

et al. 2021

View full text Add to dashboard Cite

show abstract

“…They have a high strength-to-weight ratio, physicochemical compatibility with the substrate, and are easy to apply [8]. In recent years, FRCMs were proven to be an effective strengthening technique also for members subjected to cyclic loading [9,10]. Indeed, structures as bridges and viaducts are subjected to vehicular traffic that induces fatigue loads that may affect both the load-carrying capacity and durability of the structural element.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cyclic Load on the Tensile Behavior of a Pbo FRCM Composite

Calabrese,

Cagnoni,

Bertolli

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

View full text Add to dashboard Cite

The use of externally bonded fiber-reinforced cementitious matrix (FRCM) composites represents a valid alternative to traditional techniques for the strengthening and retrofitting of existing reinforced concrete and masonry structures. FRCM composites are comprised of high strength textiles embedded within inorganic matrices and can be directly applied to the external surface of the existing structural element to increase its displacement and load capacity (i.e., axial, flexural, and shear strength). Thus, FRCM have a low invasiveness and a high strength-to-weight ratio. Recently, investigations on the bond behavior of FRCM composites showed that the presence of friction between the textile and matrix can induce damage to the fiber, which in turn determines possible reductions in the strengthened element capacity. This effect appears particularly critical in the case of cyclic and dynamic loads. In this paper, the cyclic behavior of a PBO FRCM composite is experimentally investigated using low-cycle tensile tests on composite specimens. Namely, FRCM rectangular coupons are subjected to clamping-and clevis-grip tensile tests. These tests provide important information on the effect of low-frequency dynamic loading on the composite tensile properties under different test configurations.

show abstract

“…Studies recently conducted by the authors on FRCM composites applied to the tension side of reinforced concrete (RC) beams showed their effectiveness in increasing the fatigue life of members subjected to cyclic actions, such as in bridges and viaducts, which due to their intended use, are subjected to fatigue cycles induced by the vehicular traffic [ 14 , 15 ]. This increase in the fatigue life is due to the composite capability to reduce the tensile stress acting on steel rebars under service loads of a different extent depending on the beam geometry and composite properties [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Low- and High-Cycle Fatigue Behavior of FRCM Composites

et al. 2021

Self Cite

View full text Add to dashboard Cite

This paper describes methods, procedures, and results of cyclic loading tensile tests of a PBO FRCM composite. The main objective of the research is the evaluation of the effect of low- and high-cycle fatigue on the composite tensile properties, namely the tensile strength, ultimate tensile strain, and slope of the stress–strain curve. To this end, low- and high-cycle fatigue tests and post-fatigue tests were performed to study the composite behavior when subjected to cyclic loading and after being subjected to a different number of cycles. The results showed that the mean stress and amplitude of fatigue cycles affect the specimen behavior and mode of failure. In high-cycle fatigue tests, failure occurred due to progressive fiber filaments rupture. In low-cycle fatigue, the stress–strain response and failure mode were similar to those observed in quasi-static tensile tests. The results obtained provide important information on the fatigue behavior of PBO FRCM coupons, showing the need for further studies to better understand the behavior of existing concrete and masonry members strengthened with FRCM composites and subjected to cyclic loading.

show abstract

Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate

Cited by 16 publications

References 43 publications

Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength

Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength

Effect of Cyclic Load on the Tensile Behavior of a Pbo FRCM Composite

Low- and High-Cycle Fatigue Behavior of FRCM Composites

Contact Info

Product

Resources

About