Analytical solution of the bond behavior of FRCM composites using a rigid-softening cohesive material law

Calabrese, Angelo Savio; Colombi, Pierluigi; D’Antino, Tommaso

doi:10.1016/j.compositesb.2019.107051

Cited by 46 publications

(23 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A trilinear CML was employed to study the bond behavior of PBO-concrete joints and allowed for an accurate modeling of the corresponding load response [39]. Simpler CML were also employed (e.g., bilinear elasto-fragile [40] or rigid-softening [41]). Although these CML can be easily calibrated, their simple shape entails for less accurate load responses with respect to those obtained with a trilinear CML.…”

Section: Analytical Studymentioning

confidence: 99%

See 1 more Smart Citation

Study of the Bond Capacity of FRCM- and SRG-Masonry Joints

2021

Self Cite

View full text Add to dashboard Cite

Fiber-reinforced cementitious matrix (FRCM) and steel-reinforced grout (SRG) have been increasingly applied as externally bonded reinforcement to masonry members in the last few years. Unlike fiber-reinforced polymer (FRP), FRCM and SRG have good performance when exposed to (relatively) high temperature and good compatibility with inorganic substrates, and they can be applied to wet surfaces and at (reasonably) low temperatures. Although numerous studies investigated the mechanical properties and bond performance of various FRCM and SRG, new composites have been developed recently, and their performance still needs to be assessed. In this study, the bond behavior of three FRCM composites and one SRG composite applied to a masonry substrate is investigated. Sixteen single-lap direct shear tests (four tests for each composite) are performed. The FRCM studied comprised one layer of carbon, PBO (polyparaphenylene benzobisoxazole), or alkali-resistant (AR)-glass bidirectional textile embedded within two cement-based matrices. The SRG composite comprised one layer of a unidirectional stainless-steel cord textile embedded within a lime-based matrix. The results show a peculiar bond behavior and failure mode for each composite. Based on these results, the behavior of the carbon and PBO FRCM is modeled solving the bond differential equation with a trilinear cohesive material law (CML).

show abstract

Section: Analytical Studymentioning

confidence: 99%

“…This difference is caused by the experimental test control mode, which enforced a monotonical increase of global slip during the entire tests. Further details regarding the occurrence of snap-back in analytical and experimental FRP-substrate and FRCM-substrate joints can be found in [41,47]. Figure 14.…”

Section: Simulation Of the Load Responsementioning

confidence: 99%

Study of the Bond Capacity of FRCM- and SRG-Masonry Joints

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Further increase of the machine stroke after σ* determined a reduction of the applied load with increasing global slip at the FDS, whereas the slip at the loaded end of the PDS (not shown in Figure 4b) remained approximately constant or slightly decreased, probably due to the recovery of the elastic deformation of the fibers. The applied stress eventually plateaued at a value σ f associated with the presence of friction at the matrix-fiber interface [23,52] on the FDS. For specimen MB_300_60_B_3, the applied friction stress at the completion of the test was lower than that of specimens MB_300_60_B_1 and 2 (Figure 4b).…”

Section: Quasi-static Monotonic Testsmentioning

confidence: 99%

“…The peak and friction stresses of all quasi-static monotonic tests are reported in Table 3 together with their average values for the three specimens and corresponding coefficient of variation (CoV). Following the procedure proposed in [23,52,53], σ f was computed as the average of the applied stress within the range of g where the first derivative of σ(g) with respect to g was within (−200,0). This range is highlighted in Figure 4b at the tail of each curve.…”

Section: Quasi-static Monotonic Testsmentioning

confidence: 99%

Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate

et al. 2020

Self Cite

View full text Add to dashboard Cite

Several reinforced-concrete (RC) structural elements are subjected to cyclic load, such those employed in highway and railroad bridges and viaducts. The durability of these elements may be reduced as a consequence of fatigue, which mainly affects the steel reinforcement. The use of externally bonded (EB) fiber-reinforced cementitious matrix (FRCM) composites allows the moment capacity to be shared by the internal reinforcement and the EB composite, thus increasing the fatigue life of the strengthened RC member. The effectiveness of EB FRCM composites is related to the composite bond properties. However, limited research is currently available on the effect of fatigue on the bond behavior of FRCM-substrate joints. This study provides first the state of the art on the fatigue behavior of different FRCM composites bonded to a concrete substrate. Then, the fatigue bond behavior of a polyparaphenylene benzo-bisoxazole (PBO) FRCM is experimentally investigated using a modified beam test set-up. The use of this set-up provided information on the effect of fiber-matrix interface shear and normal stresses on the specimen fatigue bond behavior. The results showed that fatigue loading may induce premature debonding at the matrix-fiber interface and that stresses normal to the interface reduce the specimen fatigue life.

show abstract

“…Depending on several parameters, such as the matrix and textile type and layout and the properties of substrate and matrix, debonding may occur at different interfaces [23]. For FRCM that feature fibers that are not coated (i.e., not impregnated/sized with organic resin), debonding at the matrix-fiber interface has been frequently reported [24][25][26][27]. In the case of SRG composites, the debonding of the external matrix layer (that covers the fibers) together with the fibers from the internal layer (bonded to the substrate), referred to as matrix interlaminar failure, has been often observed [28,29].…”

Section: Introductionmentioning

confidence: 99%

Some Key Aspects in the Mechanics of Stress Transfer Between SRG and Masonry

2020

View full text Add to dashboard Cite

The use of composite materials to strengthen masonry structures has become common practice within the civil engineering community. Steel-reinforced grout (SRG), which comprises high-strength steel fibers embedded in a mortar matrix, is part of the family of the fiber-reinforced cementitious matrix (FRCM) composites that represent a suitable alternative to fiber-reinforced polymer (FRP) composites for strengthening existing structures. Although studies on FRCMs have already reached a certain level of maturity, some key issues remain open, such as the role of matrix type and layout, substrate properties, and test rate. This paper focuses on some of these issues. The results of single-lap direct shear tests on masonry blocks strengthened with SRGs are presented to analyze the bond behavior between the composite material and the substrate. Four aspects are considered: (1) the change in the width of the SRG mortar matrix while keeping the width of the fiber sheet fixed; (2) the type of mortar used for the SRG; (3) the influence of the test rate, and (4) the type of substrate (i.e., concrete vs. masonry). The results obtained indicate the active role of the matrix layout and the importance of the test rate, encouraging further investigations to clarify these aspects.

show abstract

Analytical solution of the bond behavior of FRCM composites using a rigid-softening cohesive material law

Cited by 46 publications

References 31 publications

Study of the Bond Capacity of FRCM- and SRG-Masonry Joints

Study of the Bond Capacity of FRCM- and SRG-Masonry Joints

Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate

Some Key Aspects in the Mechanics of Stress Transfer Between SRG and Masonry

Contact Info

Product

Resources

About