Masonry Walls Retrofitted with Vertical FRP Rebars

Coccia, Simona; Carlo, Fabio Di; Imperatore, Stefania

doi:10.3390/buildings10040072

Cited by 9 publications

(5 citation statements)

References 45 publications

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“…One example of composite brick masonry walls with brick, FRP, mesh, and fabric-reinforced cementitious matrix (FRCM) masonry is detailed in [61]. The OoP performance of the retrofitting system consisted of a mechanical coupling between the active confinement of the masonry system of steel straps and CFRP strips clearing up the delamination interruption when the transfer of stresses from the steel straps to the CFRP strips occurs on both sides of a bent beam [62]. The combination of shotcrete and FRCM mesh with carbon FRP strips as a strengthening technique enhances the mechanical and durability performance of composite masonry walls (Figure 4) [63].…”

Section: Classification Of the Strengthening Techniques Of Masonry Wallsmentioning

confidence: 99%

Review of Out-of-Plane Strengthening Techniques of Unreinforced Masonry Walls

Thomoglou,

Jagadesh,

Voutetaki

2023

Fibers

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When a seismic load is applied horizontally or laterally on unreinforced masonry walls (URM), the walls behave in two different ways, viz., in-plane (IP) and out-of-plane (OoP). This review beneficially provides a literature overview of the most cited research papers on Scopus, and the database is evaluated with VOSviewer software for scientometric analysis. This review paper delves into the practical applications of various types of reinforcement for masonry walls, specifically focusing on four commonly used systems: externally bonded strengthening techniques using fiber-reinforced polymers (FRP), steel-reinforced grout (SRG), fabric-reinforced cementitious mortar (FRCM), and textile-reinforced mortars (TRM). The main objective of the paper is to explore the efficacy of these reinforcement techniques in strengthening masonry walls, and to provide a comprehensive overview of their respective advantages and limitations. A further detailed study of the extent of the literature is performed about the effect of the different strengthening systems on the mechanical properties of different categories of masonry walls like a cement block, stone, and clay brick are described and categorized. The efficiency of OoP strengthening can depend on various factors, such as the types of masonry units, the rendering mortar, the type of strengthening system, the bond between the different materials interfaces, the geometry of the wall, and the loading conditions. By utilizing the practical method of Dematel (Decision-making trial and evaluation laboratory) analysis, this review can delve deeply into the impact of various factors and precisely identify the crucial components of the cause-and-effect connection. The results indicate that the bond between material interfaces is the critical factor. This meticulous and structured review offers valuable perspectives for researchers and engineers, showcasing current research trends and presenting potential avenues for future exploration.

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Section: Classification Of the Strengthening Techniques Of Masonry Wallsmentioning

confidence: 99%

Review of Out-of-Plane Strengthening Techniques of Unreinforced Masonry Walls

Thomoglou,

Jagadesh,

Voutetaki

2023

Fibers

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“…The mechanisms of the seismic response of confined masonry buildings for in-and out-of-plane seismic effects were explained thoroughly in the Seismic Design Guide for Low-Rise Confined Masonry Buildings [28]. Some retrofitting interventions might be required to strengthen masonry panels [29,30]. If not properly retrofitted, the repair costs for masonry infilled panels that do not have an adequate seismic strength can be significant [31].…”

Section: Retrofitting Asymmetric Reinforced Concrete Frame Buildings: a Worst-case Scenariomentioning

confidence: 99%

Seismic Retrofitting of Irregular Pre-80s Low-rise Conventional RC Building Structures

Lie

Utomo

et al. 2021

ced

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A resilience and seismic safety evaluation method of under-qualified concrete structures designed based on codes prior to the introduction of earthquake provisions is presented. A numerical method for evaluating and improving a structure’s performance and resilience through jacketing and Carbon Fiber Reinforced Polymers (CFRP) retrofitting was developed. The model analyzed the structure’s existing condition, inadequate elements were identified, and segments that required strengthening were determined. Retrofitting and external reinforcing techniques were applied, and their effectiveness evaluated. Elements identified as insufficient were subjected to a strengthening iteration process to ensure that all qualifications were fulfilled. It was proven that the numerical simulation was accurate, cost-effective and time-saving in evaluating deficient structures and the effectiveness of their strengthening methods. The numerical model and analysis in conjunction with the technology of jacketing and CFRP retrofitting provide a fast and straightforward solution for older structures in ameliorating their resilience and overall performance

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“…The seismic conduct of prefabricated strengthened shear partitions with vertical joints was investigated by Zhang and Wang [17,18], in which shear walls were constructed in a pilot building. Coccia et al [19] studied the overall seismic performance of masonry partitions modified with vertical FRP stiffeners and found that conventional methods of seismic strengthening of masonry partitions have an impact on the seismic performance of the components. Generally, out-ofsurface bending behavior is used for modification.…”

Section: Introductionmentioning

confidence: 99%

Comparative Response Spectrum Analysis on 15- and 50-Story Reinforced Concrete Buildings Having Shear Walls with and without Openings as per EN1998-1 Seismic Code

Abate,

Evangelista,

Tam

2023

Buildings

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Medium-rise reinforced concrete (RC) framed apartment complexes with stories ranging from 15 to 50 are becoming more common in Ethiopia’s main cities. In these RC-framed structures, shear walls are included for lateral load resistance. As apertures are frequently provided in shear walls, it is critical to evaluate their influence on story drift, stiffness, shear and moments, and stress within the shear walls. A 3D study with five different cases was carried out with ETABS version 19.00 software to investigate the influence of apertures in a building’s shear wall. This study looks at the effects of changing the size and location of these apertures. Based on this analysis, extensive data were acquired, and useful conclusions were formed that will be useful to practicing engineers. The seismic parameter utilized for the response spectrum study was Building Code of Ethiopia ES8-15, which conforms to Eurocode 8-2004 seismic code guidelines (based on EN1998-1) with target response spectrum type-I. The following parameters were used: ground acceleration, ag/g = 0.1, spectrum type = I, ground type = B, soil factor, S = 1.35, spectrum period, Tb, = 0.05 s, spectrum period, Tc = 0.25 s, spectrum period, Td = 1.2 s, lower bound factor, beta = 0.2, behavior factor = 1, and damping ratio = 5%. The outcomes are compared using various parameters such as displacement, story drift, story stiffness, story shear, and story moment both with and without shear wall opening cases. This study will give tremendous insight into the effect of shear wall openings on the performance of the structure. The analysis in this work was carried out on a linear model, which may not represent the complete local response of the structure; thus, future researchers should perform nonlinear analysis based on a performance-based design. It was concluded from this investigation that incorporating shear walls considerably enhanced the performance of the building over framed structures. Shear wall openings in a structure have a significant influence on the building’s performance. Due to their significant resistance to earthquake forces, shear wall structures are highly recommended for seismic hazard zones.

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Masonry Walls Retrofitted with Vertical FRP Rebars

Cited by 9 publications

References 45 publications

Review of Out-of-Plane Strengthening Techniques of Unreinforced Masonry Walls

Review of Out-of-Plane Strengthening Techniques of Unreinforced Masonry Walls

Seismic Retrofitting of Irregular Pre-80s Low-rise Conventional RC Building Structures

Comparative Response Spectrum Analysis on 15- and 50-Story Reinforced Concrete Buildings Having Shear Walls with and without Openings as per EN1998-1 Seismic Code

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