In-plane shear performance of masonry panels strengthened with FRP

Marcari, Giancarlo; Manfredi, Gaetano; Prota, Andrea; Pecce, Marisa

doi:10.1016/j.compositesb.2006.11.004

Cited by 175 publications

(80 citation statements)

References 12 publications

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“…Many researchers have tried to evaluate the performance of retrofitted masonry using full-scale brick units with size of masonry panels ranging from 1070 to 1975 mm but it requires large size testing facilities and a large amount of research funds [10,18,19,38]. Structural tests of scaled models are also an alternative to understand the behavior of masonry wall system.…”

Section: Experimental Programmentioning

confidence: 99%

“…Whereas for out-of-plane bending test, FRP strip width of 40 mm with fabric thickness of 0.5 mm was used. In the case of FRP and FRP + PP-band retrofitted masonry panels, quantity of FRP was decided based upon the FRP reinforcement ratios used in experiments conducted in the past [12,16,18,[35][36][37][38]. The surfaces of masonry walls were cleaned with the help of a wet cloth and then FRP was applied on both faces of wall using strong epoxy glue.…”

Section: Retrofitting Proceduresmentioning

confidence: 99%

“…Some of the retrofitting methods include the seismic retrofit of URM walls using externally-bonded or near surface mounted Fiber Reinforced Polymer (FRP) laminates, bars and fabrics. Experiments on various patterns and layouts of FRP have validated that FRP can significantly increase in-plane and out-of-plane strength of URM walls [7,[9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Higher strength to weight ratio, ease of application and corrosion resistance are some of well-known advantages of FRP retrofitting technique over conventional retrofitting methods.…”

Section: Introductionmentioning

confidence: 99%

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Fiber Reinforced Polymer and Polypropylene Composite Retrofitting Technique for Masonry Structures

et al. 2015

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In the current research work, an attempt is made to increase the seismic capacity of unreinforced masonry (URM) structures by proposing a new composite material which can improve shear strength and deformation capacity of URM wall systems. Fiber Reinforced Polymer (FRP) having high tensile and shear stiffness can significantly increase in-plane and out-of-plane strength of masonry walls, but, inherently, FRP strengthened wall systems exhibit brittle failure under extreme seismic loading. Polypropylene (PP-band) is a low cost material with sufficient ductility and deformation capacity. Keeping in view the behavior of FRP and PP-band, a composite of FRP and PP-band is proposed for retrofitting of URM walls. Mechanical behavior of the proposed composite material is assessed by carrying out an in-plane diagonal compression test and an out-of-plane bending test on twenty-five 1/4-scaled masonry wall panels. Experimental plan for each panel, URM, PP-band retrofitted, FRP retrofitted and FRP + PP-band retrofitted masonry, is diagonal compression test and three-point bending test. Experimental results have determined that FRP + PP-band composite increased, not only the initial peak strength, but also the ductility, deformation capacity and residual strength of URM wall systems. OPEN ACCESSPolymers 2015, 7 964

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Section: Experimental Programmentioning

confidence: 99%

Section: Retrofitting Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fiber Reinforced Polymer and Polypropylene Composite Retrofitting Technique for Masonry Structures

et al. 2015

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“…ρ H , which represents a measure of the effective axial stiffness of the external FRP reinforcement of a masonry panel, where E f is the Young's modulus of FRP and ρ H is the horizontal FRP reinforcement ratio, defined as the area of horizontal FRP strips on both sides of the panel divided by the product of the height and the thickness of the panel. Based on experimental results by Marcari and co-autohrs [10], the effective axial stiffness equal to 60 MPa has been considered. The authors have concluded that effective axial stiffness of the FRP strips larger than 15 MPa changes the original failure mode of the panels clearly changed from shear to a shear/flexural mode; consequently, larger gains in lateral strength were achieved.…”

Section: Fiber-reinforced Polymersmentioning

confidence: 99%

Seismic rehabilitation of masonry heritage structures with base-isolation and with selected contemporary strengthening measures

Kilar¹,

Petrovčič²

2017

Int. J. SAFE

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In the seismically active zones of southern and central Europe, unreinforced masonry (URM) structures are one of the most common types of buildings. Some of them possess a high historical value and could therefore be classified as part of the architectural heritage, requiring special attention with regard to their preservation and retrofitting measures. In practice, however, the accurate prediction of the seismic response of such structures often proves to be difficult, not only due to the complex geometrical features of their individual architectural parts, but also due to the composite and non-homogeneous nature of URM. Due to the great variety of structural configurations and materials used, rational approaches for the assessment of the seismic safety levels of such buildings are needed. The paper analyses the applicability of two contemporary seismic strengthening measures, namely the use of fibre-reinforced polymer composites and the implementation of base-isolation to achieve the desired, code-based seismic protection levels. A three-storey masonry building was considered in the study. Non-linear static analyses for different levels of seismic intensities were conducted on a mathematical model of the fixed-base, FRP-strengthened and base-isolated variants of the structure.

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“…Fiber-reinforced polymer (FRP) materials recently gained popularity in a variety of retrofitting solutions aimed at upgrading structural members in existing civil engineering structures, such as concrete columns [1], wooden floor beams [2] and masonry panels [3]. As a matter of fact, the mechanical response of the adhesive interface often controls the structural performance of reinforced concrete (RC) members strengthened by externally-bonded (EB) FRP strips.…”

Section: Introductionmentioning

confidence: 99%

A Unified Theoretical Model for the Monotonic and Cyclic Response of FRP Strips Glued to Concrete

Martinelli

Caggiano

2014

Polymers

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Abstract:The mechanical behavior of the adhesive interface between the fiber-reinforced polymer (FRP) strip and the concrete substrate often controls the response of FRP-strengthened reinforced concrete (RC) members. Plenty of studies devoted to understanding the mechanical behavior of FRP strips glued to concrete are currently available in the scientific literature. However, they are mainly focused on the response under monotonic actions, which is certainly relevant in a wide class of practical applications. Conversely, few contributions are currently available to better understand the response of FRP-to-concrete interfaces under cyclic actions, such as those deriving from either seismic excitations or traffic loads. This paper presents a unified numerical approach to simulate both monotonic and cyclic behavior of FRP plates glued on quasi-brittle substrates like those made of concrete. Particularly, a damage-based approach is proposed to simulate the fracture behavior of FRP-to-concrete joints under loading/unloading cycling tests. The model is formulated within the general framework of Fracture Mechanics and is based on assuming that fracture at the FRP-to-concrete interface develops in (pure shear) mode II, as widely accepted in similar problems. Two alternative expressions of the bond-slip behavior are herein considered and their preliminary validation is finally proposed. The proposed results highlight the difference between the monotonic and the cyclic response; particularly, they show that the latter is characterized by a significantly lower force and displacement capacity.

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In-plane shear performance of masonry panels strengthened with FRP

Cited by 175 publications

References 12 publications

Fiber Reinforced Polymer and Polypropylene Composite Retrofitting Technique for Masonry Structures

Fiber Reinforced Polymer and Polypropylene Composite Retrofitting Technique for Masonry Structures

Seismic rehabilitation of masonry heritage structures with base-isolation and with selected contemporary strengthening measures

A Unified Theoretical Model for the Monotonic and Cyclic Response of FRP Strips Glued to Concrete

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