A Stress-Strain Model for Concrete Cylinders Confined by Both Carbon Fiber Sheets and Hoop Reinforcement

Hosotani, Manabu; Kawashima, Koichiro

doi:10.2208/jscej.1999.620_25

Cited by 7 publications

(6 citation statements)

References 3 publications

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“…(1) The stress-strain model for the concrete confined by a few stirrups (region P1 and P2 of the AA section, Table 7) on the base of previously reported models [70]; (2) The experimental stress-strain curve for the UHS concrete used to repair the column R16-UHS (region P2 of the BB section, Table 7); (3) The experimental stress-strain curve for the UHP concrete used to repair the column R16-UHP (region P2 of the BB section, Table 7); (4) The skeleton curve that approximates the experimental curves obtained for the turned and unturned steel rebar in Figure 8.…”

Section: Numerical Fiber Models and Section Analisysmentioning

confidence: 99%

Severely Damaged Reinforced Concrete Circular Columns Repaired by Turned Steel Rebar and High-Performance Concrete Jacketing with Steel or Polymer Fibers

et al. 2018

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A new strategy that repairs severely damaged reinforced concrete (RC) columns after an earthquake is proposed as a simpler and quicker solution with respect to the strategies currently available in the literature. The external concrete parts are removed from the column surface along the whole plastic hinge region to uncover the steel reinforcement. The transverse steel is cut away, and each longitudinal rebar is locally substituted by steel rebar segments connected by welding connections to the original undamaged rebar pieces outside the intervention zone. The new rebar segments have a reduced diameter achieved by turning to ensure plastic deformation only in the plastic hinge, protecting the original rebar and the welding connections. The connection is specifically designed to be effective and simple, and is directly realized on column reinforcement. Finally, the removed concrete is restored by a jacket built with high-performance concrete with steel or polymer fibers. The use of concrete with high volume fraction of polymer fibers to repair the column is investigated for the first time in this paper. This concrete was characterized by compression and flexural tests in the laboratory and its mechanical characteristics were compared with those of the concrete with steel fibers, which are being increasingly used in construction. The repair strategy was applied to two RC columns (1:6 scaled bridge piers), tested by asymmetric cyclic tests. The results show that the column strength, stiffness, and ductility were restored, and the energy dissipation capacity improved. The experimental evidence was investigated by fiber models in OpenSees.

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Section: Numerical Fiber Models and Section Analisysmentioning

confidence: 99%

Severely Damaged Reinforced Concrete Circular Columns Repaired by Turned Steel Rebar and High-Performance Concrete Jacketing with Steel or Polymer Fibers

et al. 2018

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“…The behaviors of the cover and core concretes of the specimens P16-1, P16-2 and R16-SCC-SR-1 were described by means of the analytical stress-strain model proposed by Hosotani et al [43] for concrete confined by CFRP and/or steel stirrups.…”

Section: Numerical Fiber Section Analysesmentioning

confidence: 99%

“…The concrete maximum deformation was evaluated by Hosotani 2154 et al [43] equation using the maximum value of the experimental CFRP deformation measured during the cyclic tests (about 0.005).…”

Section: Numerical Fiber Section Analysesmentioning

confidence: 99%

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Ultra-High-Performance Fiber-Reinforced Concrete Jacket for the Repair and the Seismic Retrofitting of Italian and Chinese Rc Bridges

Lavorato¹,

Bergami²,

Nuti³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Richart (1928) et al conducted a study to improve the strength (of concrete members) through the lateral binding of concrete, whale Mander et al (1988) demonstrated the effect of lateral binding through their study that mathematically examined the stress-strain relationship of laterally bound concrete; thereafter, researchers have developed the design formulae of laterally bound concrete with the development of diverse kinds of fibers. Lee et al (2007) and Cho (2007) also conducted tests to predict the strength and strain of the concrete retrofitted with FRP, and Hosotani and Kawashima (1999) and Youssef et al (2007) proposed the design formulae of the lateral binding of rectangular and cylindrical columns and then suggested the formulae to predict the ultimate strength and strain of retrofitted structures and the post -yield ductility.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of CFRP Reinforced Concrete Members Utilizing Fuzzy Technique

Chung

Hur

Park

2018

Int J Concr Struct Mater

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Aging and structural deterioration under severe environments are major causes of damage in reinforced concrete (RC) structures, such as buildings and bridges. Degradations such as concrete cracks, corrosion of steel, and deformation of structural members can significantly degrade the structural performance and safety. Therefore, effective and easy-to-use methods are desired for repairing and strengthening such concrete structures. Various methods for the strengthening and rehabilitation of RC structures have been developed over the past several decades. Recently, FRP composite materials have emerged as a cost-effective alternative to conventional materials for repairing, strengthening, and retrofitting deteriorating/deficient concrete structures, by externally bonding FRP laminates to concrete structural members. The main purpose of this study is to investigate the effectiveness of the FRP retrofit for circular type concrete columns under the framework of the adaptive neuro-fuzzy inference system (ANFIS). Retrofit ratio, strength of existing concrete, thickness, number of layer, stiffness, ultimate strength of fiber, and size of specimens are used as input parameters to predict strength, strain, and stiffness of the post-yielding modulus. These proposed ANFIS models show reliable increased accuracy in predicting the constitutive properties of concrete retrofitted by FRP, compared to the constitutive models suggested by other researchers. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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A Stress-Strain Model for Concrete Cylinders Confined by Both Carbon Fiber Sheets and Hoop Reinforcement

Cited by 7 publications

References 3 publications

Severely Damaged Reinforced Concrete Circular Columns Repaired by Turned Steel Rebar and High-Performance Concrete Jacketing with Steel or Polymer Fibers

Severely Damaged Reinforced Concrete Circular Columns Repaired by Turned Steel Rebar and High-Performance Concrete Jacketing with Steel or Polymer Fibers

Ultra-High-Performance Fiber-Reinforced Concrete Jacket for the Repair and the Seismic Retrofitting of Italian and Chinese Rc Bridges

Performance Evaluation of CFRP Reinforced Concrete Members Utilizing Fuzzy Technique

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