In-Plane Shear Performance of Masonry Walls after Strengthening by Two Different FRPs

This study primarily focuses on the constitutive modeling of masonry walls strengthened with fiber-reinforced polymers (FRP). In general, providing suitable relations for the material characterization of the masonry constituents so that the nonlinear finite element (NLFEA) applications of the elasto-plastic theory achieves a close fit to the experimental load-displacement diagrams of the walls subjected to in-plane loadings is desired. In this chapter, two relations proposed for masonry columns confined with FRP are adjusted for the cohesion and the internal friction angle of both units and mortar. Relating the mechanical parameters to the uniaxial compression strength and the hydrostatic pressure acting over the wall surface, the effects of major and intermediate principal stresses σ 1 and σ 2 on the yielding and the shape of the deviatoric section are then reflected into the analyses. Finally, NLFEA results for the walls tested in different studies showed a good match with the experimental ones.

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“…applied on the top of the wall. The modulus of elasticity and the tensile strength of FRP sheet were 10,000 and 740 MPa, respectively [49].…”

Section: New Trends In Structural Engineeringmentioning

confidence: 99%

Constitutive Modeling of Masonry Walls Strengthened with Fiber Reinforced Polymers

Doran¹,

Koksal²,

Aktan³

et al. 2018

New Trends in Structural Engineering

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“…Furthermore, the bonded FRP crossing the local cracks contributes bridge e ects to secure the structure stability and integrity and to restrain the global deformation. e bidirectional ber structure of the grid is more e ective to restrict the diagonal shear crack failure [22,27,28].…”

Section: Failure Mechanismmentioning

confidence: 99%

Seismic Performance of Multistorey Masonry Structure with Openings Repaired with CFRP Grid

Tao

Xue-ping

et al. 2018

Advances in Civil Engineering

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FRP composites have been used for strengthening RC and masonry structures for decades. However, the researches on repairing multistorey masonry structures using FRP grids were relative less. In the present paper, an experimental study on the seismic performance of multistorey masonry structure with openings repaired with CFRP grid is introduced. Specifically, a 1/3-scale three-floor masonry wall with window openings was tested under quasistatic action to simulate the seismic damages. The damaged masonry wall was then repaired by externally bonding CFRP grids to the areas where the cracks intensively occurred. The repaired masonry wall was retested under the same loading to investigate the seismic resistance and assess the recovery attributed from the CFRP grid repairing. The findings of this study showed that CFRP grid repairing could effectively postpone or even prevent the occurrence and development of cracking. The seismic resistance of the masonry, including shear capacity, energy dissipation capacity, deformability, stiffness degradation, and ductility, was restored. The application of CFRP grid may shift the failure mechanism of the multistorey masonry wall. The recommendation of repair scheme for the similar structures was also proposed in accordance with the findings of the present work.

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“…Its application is relatively straightforward: RC surfaces, following an accurate cleaning through the removal of any inconsistent material, are impregnated with an epoxy resin, which is used to glue the carbon fibers to the concrete material. In conservation work, CFRP sheets were initially used to reinforce masonry vaults ( Figure 1b) and walls ( Figure 1c) against the lateral loading induced by earthquakes [13][14][15][16]. The in-plane reinforcement of wall panels aims to reproduce the concept of X and V steel bracings in metal structures ( Figure 2).…”

Section: Introductionmentioning

confidence: 99%

“…A further consideration advising prudence in the use of epoxy-bonded reinforcements was raised by conservators: epoxies may permanently damage the masonry material since they irreversibly penetrate the porous stones and bricks. Statics of the resisting mechanism: from a steel structure to a CFRP-reinforced wall [13].…”

Section: Introductionmentioning

confidence: 99%

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Polypropylene as a Retrofitting Material for Shear Walls

et al. 2020

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In recent years, on account of their excellent mechanical properties, composite materials (made of epoxy-bonded carbon, glass, or aramid fibers) have been used to reinforce masonry walls against in-plane actions. These materials have proven to be an effective solution for the strengthening of unreinforced masonry (URM) walls. Lately, research has shifted to the study of different types of fibers to avoid the use of epoxy adhesives, whose long-term behavior and compatibility with masonry are poor. This paper describes an experimental program that investigated the behavior of URM shear walls strengthened with two types of commercially available polypropylene products: short fibers (fiber length = 12 mm) and polypropylene nets. This investigation aimed to evaluate the influence of polypropylene reinforcement, embedded into an inorganic matrix, in terms of the improvement of the lateral load-carrying capacity, failure mechanism, ductility, and energy dissipation capacity of URM wall panels, where nine walls were subjected to in-plane loads using a racking test setup. The study showed that using two layers of polypropylene fibers embedded into a cementitious matrix greatly increased the in-plane load capacity of the brickwork masonry. On the other hand, the test results indicated that polypropylene nets, used as a repair method for cracked shear walls, cannot improve the structural performance of the walls.

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In-Plane Shear Performance of Masonry Walls after Strengthening by Two Different FRPs

Cited by 34 publications

References 23 publications

Constitutive Modeling of Masonry Walls Strengthened with Fiber Reinforced Polymers

Constitutive Modeling of Masonry Walls Strengthened with Fiber Reinforced Polymers

Seismic Performance of Multistorey Masonry Structure with Openings Repaired with CFRP Grid

Polypropylene as a Retrofitting Material for Shear Walls

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