Aseismic retrofitting of unreinforced masonry walls using FRP

ElGawady, Mohamed A.; Lestuzzi, Pierino; Badoux, Marc

doi:10.1016/j.compositesb.2005.06.003

Cited by 101 publications

(81 citation statements)

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“…Until recently, very few systematic investigations were carried out for structures with little hysteretic energy dissipation capacity such as slender unreinforced masonry shear walls that show very different seismic behavior (Christopoulos et al, 2002 and2003). Figure 1 illustrates this fundamental difference with the hysteretic loops measured in dynamic tests on slender structural shear walls Bachmann, 2007 andElGawady et al, 2006). Even if both structural walls clearly behave in a non-linear manner, the hysteretic energy dissipation capacity is totally different.…”

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confidence: 99%

Non-linear seismic behavior of structures with limited hysteretic energy dissipation capacity

Lestuzzi

Belmouden

Trueb³

2007

Bull Earthquake Eng

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This paper investigates the non-linear seismic behavior of structures such as slender unreinforced masonry shear walls or precast post-tensioned reinforced concrete elements, which have little hysteretic energy dissipation capacity. Even if this type of seismic response may be associated with significant deformation capacity, it is usually not considered as an efficient mechanism to withstand strong earthquakes. The objective of the investigations is to propose values of strength reduction factors for seismic analysis of such structures.The first part of the study is focused on non-linear single-degree of freedom (SDOF) systems. A parametric study is performed by computing the displacement ductility demand of non-linear SDOF systems for a set of 164 recorded ground motions selected from the European Strong Motion Database. The parameters investigated are the natural frequency, the strength reduction factor, the post-yield stiffness ratio, the hysteretic energy dissipation capacity and the hysteretic behavior model (four different hysteretic models: bilinear selfcentring, with limited or without energy dissipation capacity, modified Takeda and Elastoplastic). Results confirm that the natural frequency has little influence on the displacement ductility demand if it is below a frequency limit and vice versa. The frequency limit is found to be around 2 Hz for all hysteretic models. Moreover, they show that the other parameters, especially the hysteretic behavior model, have little influence on the displacement ductility demand. New relationships between the displacement ductility demand and the strength reduction factor for structures having little hysteretic energy dissipation capacity are proposed. These relationships are an improvement of the equal displacement rule for the considered hysteretic models. In the second part of the investigation, the parametric study is extended to multi-degree of freedom (MDOF) systems. The investigation shows that the results obtained for SDOF systems are also valid for MDOF systems. However, the SDOF system overestimates the displacement ductility demand in comparison to the corresponding MDOF system by approximately 15%.

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confidence: 99%

Non-linear seismic behavior of structures with limited hysteretic energy dissipation capacity

Lestuzzi

Belmouden

Trueb³

2007

Bull Earthquake Eng

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“…There are extensive experimental and numerical researches on the in-plane retrofitting of URM walls and infills with different types of FRP laminates [11][12][13][14][15]. El-Diasity et al [16] investigated the in-plane behavior of confined masonry walls retrofitted using low-cost ferrocement and Glass Fiber Reinforced Polymer (GFRP) systems through cyclic in-plane tests.…”

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confidence: 99%

Application of Ordinary Fiber-Reinforced Concrete Layer for In-plane Retrofitting of Unreinforced Masonry Walls: Test and Modeling

et al. 2018

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The masonry walls should have sufficient in-plane strength and stiffness to withstand the seismic loads during strong ground shakings. Different retrofitting techniques are proposed for improving in-plane behavior of the Unreinforced Masonry (URM) walls. This study focuses on experimental evaluation and numerical simulation of a simple practical retrofitting technique employing Fiber Reinforced Concrete (FRC) surface layer. The simple FRC mix has conventional available fiber, low fiber content, ordinary mix design and applicable construction procedure. Effect of FRC mix including fiber type and fiber content and surface layer thickness on in-plane behavior of masonry panels made up of conventional solid clay bricks are evaluated through experimental study in accordance with ASTM E-519 diagonal tension strength of masonry panels. In addition, numerical simulation model of this retrofitting technique in ABAQUS software is proposed and validated with test results of bare and retrofitted panels.

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“…Different researchers studied the effect of FRP's on the in-plane (ElGawady et al, 2005;Erdem et al, 2006;Binici et al, 2007;Altin et al, 2008;Yuksel et al, 2010) and out-of-plane (Willis et al, 2010;Chen et al, 2012) behavior of infilled frames.…”

Section: Introductionmentioning

confidence: 99%

In-Plane Behavior of Infills using Glass Fiber Shear Connectors in Textile Reinforced Mortar (TRM) Technique

Akhoundi

Vasconcelos

Lourenço

2018

International Journal of Structural Glass and Advanced Material

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Masonry has a widespread use in the construction of the buildings even in reinforced concrete or steel frames. Past earthquakes have demonstrated the vulnerability of masonry infills resulted in the human life losses and economic costs. Recently innovative strengthening techniques such as Textile Reinforced Mortar technique (TRM) is used for enhancing the seismic response of the infills. Different procedures were suggested to enhance the bond between rendering mortar of the TRM technique and infilled frame to prevent its detachment. In this study commercial glass fiber shear connectors were used for connecting the TRM layer to the infilled frame and their response were investigated by testing the samples in the in-plane direction. The quasi static in-plane test was performed cyclically on two specimens; one without strengthening layer and another strengthened with commercial textile meshes. The results showed that TRM technique enhances the in-plane response of the infilled frames but the effectiveness of the shear connectors could be improved using proper materials.

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Aseismic retrofitting of unreinforced masonry walls using FRP

Cited by 101 publications

References 2 publications

Non-linear seismic behavior of structures with limited hysteretic energy dissipation capacity

Non-linear seismic behavior of structures with limited hysteretic energy dissipation capacity

Application of Ordinary Fiber-Reinforced Concrete Layer for In-plane Retrofitting of Unreinforced Masonry Walls: Test and Modeling

In-Plane Behavior of Infills using Glass Fiber Shear Connectors in Textile Reinforced Mortar (TRM) Technique

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