Structural performance of RC shear walls with post-construction openings strengthened with FRP composite laminates

Mosallam, Ayman; Nasr, Aml S.

doi:10.1016/j.compositesb.2016.06.063

Cited by 35 publications

(18 citation statements)

References 25 publications

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“…Along with this, clinical trials are also necessary for statistical analysis of in-vivo results to meet up all the claims. Future directions of the present research will deal with studies on the mechanical modeling and the employment of biodegradable Mg-3Si-5HA composites for the manufacturing of a wide range of multiscale composite materials and structures with arbitrary geometry at different scales Mosallam and Nasr, 2017).…”

Section: Prr 22mentioning

confidence: 99%

Physical-mechanical characterization of biodegradable Mg-3Si-HA composites

Prakash

Singh

Farina³

et al. 2018

PRR

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Purpose Porous implant surface is shown to facilitate bone in-growth and cell attachment, improving overall osteointegration, while providing adequate mechanical integrity. Recently, biodegradable material possessing such superior properties has been the focus with an aim of revolutionizing implant’s design, material and performance. This paper aims to present a comprehensive investigation into the design and development of low elastic modulus porous biodegradable Mg-3Si-5HA composite by mechanical alloying and spark plasma sintering (MA-SPS) technique. Design/methodology/approach This paper presents a comprehensive investigation into the design and development of low elastic modulus porous biodegradable Mg-3Si-5HA composite by MA-SPS technique. As the key alloying elements, HA powders with an appropriate proportion weight 5 and 10 are mixed with the base elemental magnesium (Mg) particles to form the composites of potentially variable porosity and mechanical property. The aim is to investigate the performance of the synthesized composites of Mg-3Si together with HA in terms of mechanical integrity hardness and Young’s moduli corrosion resistance and in-vitro bioactivity. Findings Mechanical and surface characterization results indicate that alloying of Si leads to the formation of fine Mg2 Si eutectic dense structure, hence increasing hardness while reducing the ductility of the composite. On the other hand, the allying of HA in Mg-3Si matrix leads to the formation of structural porosity (5-13 per cent), thus resulting in low Young’s moduli. It is hypothesized that biocompatible phases formed within the composite enhanced the corrosion performance and bio-mechanical integrity of the composite. The degradation rate of Mg-3Si composite was reduced from 2.05 mm/year to 1.19 mm/year by the alloying of HA elements. Moreover, the fabricated composites showed an excellent bioactivity and offered a channel/interface to MG-63 cells for attachment, proliferation and differentiation. Originality/value Overall, the findings suggest that the Mg-3Si-HA composite fabricated by MA and plasma sintering may be considered as a potential biodegradable material for orthopedic application.

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Section: Prr 22mentioning

confidence: 99%

Physical-mechanical characterization of biodegradable Mg-3Si-HA composites

Prakash

Singh

Farina³

et al. 2018

PRR

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“…The experimental results indicated that the best performance has been obtained from the strengthening with lateral strips and showed the improvement of hysteretic behavior and displacement capacity as well. Mosallam and Nasr (2016) have experimentally investigated the strengthening of reinforced concrete shear walls with openings using CFRP composite laminates under cyclic lateral loading. The experimental results indicated that the average peak loads of the CFRP-strengthened wall specimens with central window opening (R-WO) and eccentric door opening (R-DO) were 1.32, 1.25 times the average peak load of the unstrengthened walls with window opening (C-WO) and door opening (C-DO), respectively.…”

Section: Introductionmentioning

confidence: 99%

Strengthening of reinforced concrete shear walls with openings using carbon fiber-reinforced polymers

Husain

Eisa

Hegazy

2019

Int J Adv Struct Eng

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Reinforced concrete shear walls are one of the most widely used lateral load structural resisting elements in high rise buildings. Introducing openings in existing shear walls may be due to remodeling or municipality considerations, such as placement of staircases, windows, doors and elevators. Making openings in existing shear wall decrease the overall structural capacity and integrity of the wall, in addition to stress concentrations around the openings. This necessitates the strengthening of the opening rim with FRP wraps. This paper focuses on developing a 3D high-reliability dynamic nonlinear finite element model on ABAQUS theory manual and users' manual, version 6.10 (2010) to simulate the behavior of shear walls with openings strengthened with FRP wraps to investigate their seismic response under the monotonic loads. The proposed FE model has been validated using previous experimental data in literature. The FE results indicated that the proposed configuration of CFRP laminates substantially increases the lateral load strength and deformation capacity of the shear wall with openings and also improves the ductility and energy dissipation of the shear wall.

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“…Although there have been many experimental studies on the behaviour of reinforced concrete (RC) walls, the performance of RC walls with openings has not been investigated in the same depth. The few studies that have been published in this area [1][2][3][4][5][6] have focused on structural walls subjected to seismic forces (constant axial load + lateral loading to failure).…”

Section: Introductionmentioning

confidence: 99%

Assessment of RC walls with cut-out openings strengthened by FRP composites using a rigid-plastic approach

Popescu

Schmidt

Goltermann

et al. 2017

Engineering Structures

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Building refurbishment works frequently require the cutting of new openings in concrete walls. Cutting new openings weakens the overall response of such elements, so they usually require strengthening. However, current design codes offer little guidance on strengthening walls with openings, and less still on the use of non-metallic reinforcements such as FRP (Fibre Reinforced Polymers) to ensure sufficient load bearing capacity. This paper proposes a new procedure based on limit analysis theory for evaluating the ultimate load of walls with cutout openings that have been strengthened with carbon-FRP (CFRP). First, the approach is verified against transverse (out-of-plane) and axial (in-plane) loading for unstrengthened specimens. These loading types result in different failure mechanisms: transverse loading leads to failure due to yielding/rupture of the steel reinforcement while axial loading leads to failure by concrete crushing. Second, the proposed method is further developed for CFRPstrengthened specimens under axial loading. It accounts for the contribution of CFRP indirectly, by updating the concrete model with an enhanced compressive strength as a result of confining the piers. Predictions made using the new method agree closely with experimental results.

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Structural performance of RC shear walls with post-construction openings strengthened with FRP composite laminates

Cited by 35 publications

References 25 publications

Physical-mechanical characterization of biodegradable Mg-3Si-HA composites

Physical-mechanical characterization of biodegradable Mg-3Si-HA composites

Strengthening of reinforced concrete shear walls with openings using carbon fiber-reinforced polymers

Assessment of RC walls with cut-out openings strengthened by FRP composites using a rigid-plastic approach

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