Seismic Rehabilitation of RC Columns Under Biaxial Loading: An Experimental Characterization

Rodrigues, Hugo; Arêde, António; Furtado, André; Rocha, Patrı́cio

doi:10.1016/j.istruc.2015.03.001

Cited by 23 publications

(5 citation statements)

References 15 publications

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“…They are reported due to poor and inadequate detailing of the longitudinal and transverse reinforcement and to the use of smooth bars. Some experimental studies were carried out on evaluating and retrofitting existing RC building structures designed according to codes earlier than the 1970s [6,[17][18][19][20]. Most of these studies are related to ribbed bars.…”

Section: Seismic Behaviour Of Infilled Rc Structures: Definition Of Damage Typementioning

confidence: 99%

A Review of the Performance of Infilled RC Structures in Recent Earthquakes

et al. 2021

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The primary objective is to present the most representative types of damage observed in reinforced concrete (RC) structures due to earthquakes. Those damages are divided according to the ten most representative types. Examples and the main reasons that could trigger each failure mechanism are presented. The definition of these damage types is supported by post-earthquake damage reconnaissance missions in Sichuan (China) in 2008, L’Aquila (Italy) in 2009, Lorca (Spain) in 2011, Emilia-Romagna (Italy) in 2012, Gorkha (Nepal) in 2015, Muisne (Ecuador) in 2016 and Chiapas (Mexico) in 2017. An extensive discussion is presented concerning the infill walls’ seismic behaviour and their interaction with the RC structural elements. The presentation of the significant learnings and findings concerning the typical damage herein presented and discussed are compared with the common Southern European construction practice. The impact of the infill walls on the rehabilitation costs of damaged RC buildings is also studied. These costs are compared to those related to the structural damage and rehabilitation of the entire building structure to understand the impact of the infill walls. Finally, a case study is presented to study the effect of implementing simplified retrofitting strategies to prevent the soft-storey mechanism, one of the most common problems observed in past earthquake events.

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Section: Seismic Behaviour Of Infilled Rc Structures: Definition Of Damage Typementioning

confidence: 99%

A Review of the Performance of Infilled RC Structures in Recent Earthquakes

et al. 2021

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“…Composites such as carbon-fibre-reinforced plastic (CFRP) have the potential to reduce automotive components by 60-80% [1][2][3][4]. CFRP is also frequently adopted in other fields and applications, such as for the structural reinforcement of buildings [5,6]. However, CFRP is produced slowly by hand laying, which lowers reproducibility [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Stiffness Retention in Cyclic-Loaded CFRP Composites Produced via Novel Automatic Tape Laying

Blythe,

Fox,

Nikzad

et al. 2024

J. Compos. Sci.

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Sixteen-head automatic tape laying of non-crimped carbon-fibre-reinforced plastic is performed, and the fibre alignment is compared with that produced via hand laying. The effect of fibre alignment is tested via quasi-static and cyclic three-point bending tests. Using the Fill Multilayer (a 16-head tape-laying machine), precision fibre laying of unidirectional fabrics is performed with deliberate misalignment to examine the effect of fibre orientation and investigate the random effect on longitudinal misalignment. The automatic tape-layered coupons are compared with hand-layered carbon fibre tapes to investigate the relationship between the fibre alignment and the flexural strength. A 52% reduction in the fibre alignment scatter is achieved via the Fill Multilayer. Fibre orientation increases lead to a higher flexural strength of 16.08% for Fill Multilayer-made coupons compared with hand-layered samples. An investigation of the correlation between fibre alignment and flexural strength shows that shear-based failure increases exponentially as the alignment decreases. Fill Multilayer-made coupons have a higher void concentration due to ultrasonic welding, but also the highest modulus and flexural strength, as fibre misalignment is reduced to 1.68°, with a modulus degradation of 1.4%.

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“…As a result, developing techniques for strengthening damaged structures to increase the sustainability and durability of existing RC structures is of great practical and scientific importance [10]. In recent years, the application of Fiber-Reinforced Polymer (FRP) for repairing, strengthening, and retrofitting RC structural elements such as beams and columns has been increased [7,[11][12][13][14][15][16][17] due to its lightweight, high-strength, strong corrosion resistance, and high-durability features. Bonding FRP laminates with adhesive to concrete surfaces is a common solution for external strengthening.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Shear Reinforcing of Reinforced Concrete Beams with Carbon Fiber Reinforced Polymer Grid-Strengthened Engineering Cementitious Composite

et al. 2023

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This study investigates the shear behavior of reinforced concrete (RC) beams that have been strengthened using carbon fiber reinforced polymer (CFRP) grids with engineered cementitious composite (ECC) through finite element (FE) analysis. The analysis includes twelve simply supported and continuous beams strengthened with different parameters such as CFRP sheets, CFRP grid cross-sectional area, and CFRP grid size. To conduct the analysis, FE models of the RC beams were created and analyzed using ABAQUS software. Research results show that the strengthened RC beams with CFRP grids and ECC had approx. 30–50% higher shear capacity than reference RC beams. The composite action of CFRP grids with the ECCs also showed a significant ability to limit diagonal cracks and prevent the degradation of the bending stiffness of the RC beams. Furthermore, this study calculated the shear capacity of the strengthened beams using an analytical model and compared it with the numerical analysis results. The analytical equations showed only a 4% difference from the numerical results, indicating that the analytical model can be used in practice.

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Seismic Rehabilitation of RC Columns Under Biaxial Loading: An Experimental Characterization

Cited by 23 publications

References 15 publications

A Review of the Performance of Infilled RC Structures in Recent Earthquakes

A Review of the Performance of Infilled RC Structures in Recent Earthquakes

Stiffness Retention in Cyclic-Loaded CFRP Composites Produced via Novel Automatic Tape Laying

Finite Element Analysis of Shear Reinforcing of Reinforced Concrete Beams with Carbon Fiber Reinforced Polymer Grid-Strengthened Engineering Cementitious Composite

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