Seismic retrofitting of rectangular reinforced concrete columns using fiber composites for enhanced flexural strength

Li, Xian; Lv, Henglin; Zhang, Guang-Chang; Sha, Shi-Yu; Zhou, Shu-Chun

doi:10.1177/0731684413477222

Cited by 20 publications

(7 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, it was observed that the combination of NSM bars with CFRP wrapping improves the overall seismic performance of the column remarkably. In another study, Li et al [66] proposed using NSM GFRP rebars and CFRP jackets and CFRP anchors in the potential plastic hinge region for strengthening RC columns with a large side aspect ratio. Four types of strengthening layouts were used.…”

Section: Nsm Bars With Frp Wrappingmentioning

confidence: 99%

Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review

et al. 2019

View full text Add to dashboard Cite

Sustainability necessitates the protection of infrastructure from any kind of deterioration over the life cycle of the asset. Deterioration in the capacity of reinforced concrete (RC) infrastructure (e.g., bridges, buildings, etc.) may result from localised damage sustained during extreme loading scenarios, such as earthquakes, hurricanes or tsunamis. In addition, factors such as the corrosion of rebars or ageing may also deteriorate or degrade the capacity of an RC column, thereby necessitating immediate strengthening to either extend or ensure its design life is not limited. The aim of this paper is to provide a state-of-the-art review of various strengthening and repair methods for RC columns proposed by different researchers in the last two decades. The scope of this review paper is limited to jacketing techniques for strengthening and/or repairing both normal- and high-strength RC columns. The paper also identifies potential research gaps and outlines the future direction of research into the strengthening and repair of RC columns.

show abstract

Section: Nsm Bars With Frp Wrappingmentioning

confidence: 99%

Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Therefore, both the beam yielding deformation and the plastic deformation are key parameters. 10,13 Let us define the ratio of the two key parameters as a new factor , which is closely related to the unloading stiffness value. Therefore, equation ( 27) is proposed to predict the values of K 4 , including this new factor,…”

Section: Unloading Stiffnessmentioning

confidence: 99%

“…It has been reported that columns with high postyield stiffness have good recoverability and reparability. 12,13,14 As for the study of the stiffness and residual deformation of this type of FRP-RC composite beam, it is much needed but still lack now.…”

Section: Introductionmentioning

confidence: 99%

Study on stiffness and recoverability of Fiber Reinforced Polymers-Reinforced Concrete (FRP-RC) composite T-beams with prefabricated Basalt fiber-reinforced polymers shell

Dong¹,

Zhang

Zhu³

et al. 2015

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

This paper focuses on the stiffness and recoverability of a new type of composite beam, the Fiber Reinforced Polymers-Reinforced Concrete (FRP-RC) beam, in which steel bars are the main reinforcement. Ten pieces of beams under both static and cyclic bending load were conducted. Fiber-reinforced polymer profile made by the vacuum infusion molding process is used as reinforcement in the composite beams, in which basalt fiber-reinforced polymer sheets were axially laid at the bottom of the beams in order to improve bearing capacity, and hoop-directionally laid at the lateral side of the beams with the advantages of improving the shear resistance. A finite element model is proposed to predict nonlinear deflections and stresses. The flexural stiffness and recoverability index of this new type of composite beam are studied. The results show that the recoverability of the FRP-RC composite beam is better than that of the normal RC beam and it increases along with the fiber-reinforced polymers reinforcement ratio. Stiffness calculation formulas at various stages and residual deformation formulas are proposed. Finally, the calculation results and test results are compared, which shows that the formulas for stiffness and deformation demonstrate good precision.

show abstract

“…According to the best knowledge of the authors', reversed cyclic flexural behavior of RC members strengthened with longitudinal FRP reinforcement was studied for the first time by Ilki and Kumbasar [46]. More recently, Bournas and Triantafillou [47], Goksu et al [48], Fahmy and Wu [49], Vrettos et al [50], Li et al [51], Goksu et al [52] and Faustino and Chastre [53] also studied this type of behavior. However, in all cases, except the studies of Goksu et al [48,52], it is difficult to perceive the performance of the NSM FRP system and anchoring of NSM reinforcement into the footing in case of low strength concrete.…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Substandard RC Columns Retrofitted with Embedded Aramid Fiber Reinforced Polymer (AFRP) Reinforcement

et al. 2015

View full text Add to dashboard Cite

Many existing reinforced concrete structures were constructed with substandard characteristics. Low quality concrete, poor transverse reinforcement details and insufficient flexural strength are among the most common deficiencies. While substandard structures are in need of retrofitting, particularly in seismic areas, problems such as high costs and disturbance to occupants are major obstacles for retrofit interventions. Fiber reinforced polymers can provide feasible retrofit solutions with minimum disturbance to occupants. In this study, the basic aim is to investigate the flexural seismic performance of substandard reinforced concrete columns retrofitted with embedded longitudinal fiber reinforced polymer reinforcement without increasing the original dimensions of the columns. In the experimental study, the reference and retrofitted columns were tested under constant vertical and reversed cyclic lateral loads. Three different connection methods of aramid fiber reinforced polymer reinforcement to the footing were investigated experimentally. A significant enhancement was obtained in lateral flexural strength through the proposed retrofitting method. Furthermore, it was observed that the cyclic lateral drift capacities of the retrofitted columns were as high as 3%, which can be deemed as quite satisfactory against seismic actions. The comparison of the experimental data with analytical calculations revealed that a conventional design approach assuming composite action between concrete and fiber reinforced polymer reinforcement can be used for flexural retrofit design. Experimental results also demonstrated that strain limit for longitudinal fiber reinforced polymer (FRP) reinforcement should be remarkably lower in case of reversed cyclic loading conditions.

show abstract

Seismic retrofitting of rectangular reinforced concrete columns using fiber composites for enhanced flexural strength

Cited by 20 publications

References 14 publications

Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review

Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review

Study on stiffness and recoverability of Fiber Reinforced Polymers-Reinforced Concrete (FRP-RC) composite T-beams with prefabricated Basalt fiber-reinforced polymers shell

Seismic Behavior of Substandard RC Columns Retrofitted with Embedded Aramid Fiber Reinforced Polymer (AFRP) Reinforcement

Contact Info

Product

Resources

About