Cyclic Stress–Strain Relationships of FRP Confined Concrete Members

Demir, Cem; Darılmaz, Kutlu; İlki, Alper

doi:10.1007/s13369-014-1517-5

Cited by 12 publications

(4 citation statements)

References 30 publications

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“…Demir et al [32] proposed a cyclic stress-strain model for FRP-confined concrete circular and rectangular columns, but their test database also has some deficiencies similar to those found in Lam and Teng's study [24]. Abbasnia et al [26]- [30] and Ziaadiny [31] conducted some studies on the cyclic stress-strain behaviour of circular, square and rectangular prisms confined with FRP composites and reported many valuable results about different aspects of the cyclic behaviour of these specimens.…”

Section: Introductionmentioning

confidence: 99%

Unified cyclic stress‐strain model for FRP‐confined concrete circular, square and rectangular prisms

Ziaadiny

Abbasnia

2016

Structural Concrete

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IntroductionIn recent years, owing to some excellent results when using FRP materials in seismic retrofits of reinforced concrete structures, many studies have been carried out to investigate the behaviour of reinforced concrete members confined with FRP composites. For concrete columns, FRP composites are used as confining jackets. FRP confinement can change the behaviour of concrete columns and enhance their strength and ductility. Thus, for proper design of concrete columns confined with FRP composites, good modelling of the monotonic and cyclic stressstrain curves of these columns is necessary. Over the past decade, extensive studies have investigated the monotonic behaviour of steel and FRP-confined concrete in circular and rectangular columns, and several models have been proposed for the monotonic stressstrain behaviour of them [1]- [21].The computational analysis of reinforced concrete structures subjected to dynamic or cyclic loadings requires realistic stress-strain material models to reproduce the real behaviour of the structure. Research on the cyclic response of concrete intends to provide efficient models capable of predicting all the hysteretic characteristics of the material subjected to cyclic loading. Thus, in recent years, some studies have been conducted on the behaviour and modelling of FRP-confined concrete columns under axial cyclic compression [20]- [28].Shao et al.[22] proposed a cyclic stress-strain model for FRP-confined concrete circular specimens. Lam et al. [23] has shown that this model is inadequate for predicting the unloading path of FRP-confined concrete under cyclic compression and is incapable of predicting the cumulative effect of loading history on the stress-strain response of concrete [23]. Lam and Teng [24] developed a cyclic stress-strain model for these specimens based on a test database that contained circular specimens confined by FRP composites. Although their model predicts all types of cyclic loading pattern, the test database that was used for the generation of their model has some deficiencies that may reduce the accuracy of the model results: 1) The unloading path of cyclic loading was not continued to zero stress so the plastic strain was obtained approximately.2) The maximum number of cycle repetitions at each prescribed unloading strain was three cycles. Thus, the effects of subsequent cycles on the stress deterioration and plastic strain cannot be determined from their test database.3) The test database of their study does not include partial unloading and partial reloading cycles.

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Section: Introductionmentioning

confidence: 99%

Unified cyclic stress‐strain model for FRP‐confined concrete circular, square and rectangular prisms

Ziaadiny

Abbasnia

2016

Structural Concrete

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“…Raspravlja se o točnosti nekoliko modela naprezanja i deformacija predloženih za beton omotan FRP-om za predviđanje krivulja histereznih anvelopa i grana rasterećenja i ponovnog opterećenja cikličnih odnosa naprezanja i deformacije ispitanih uzoraka. Autori su također predložili predviđanje grana za rasterećenje i ponovno opterećenje na temelju cikličnih ispitivanja provedenih samo u ovu svrhu [38]. Uvođenje naprednih polimernih kompozita u građevinske objekte bio je vrlo brz proces, a izvanredna svojstva ovih materijala omogućila su projektantima veće povjerenje u potencijal materijala i posljedično njihovu primjenu u raznim građevinskim projektima, uključujući pojačanje zgrada [39].…”

Section: Uvodunclassified

Software development for retrofitting columns with FRP composites: A case study

Lakusic

2024

JCE

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This manuscript delineates an extensive inquiry into a structure in Ankara, Turkey, specifically focusing on its existing state, retrofitting initiative, and concomitant software development. The evaluation of the building’s current state, earthquake loads, and anticipated structural stresses was conducted per the Turkish Seismic Code of 2018. The structural model was analysed, incorporating data derived from on-site inspections, surveys, and samples from the building’s concrete core and reinforcement elements by employing non-linear calculation methods. Remedial measures were undertaken after recognising deficiencies in the structure’s performance, including strengthening columns and selecting slabs by applying Fibre-Reinforced Polymer (FRP) composites. Subsequently, the authors engineered the FRP Composite Column Strengthening software. This software facilitates the computation of axial compression strength, shear strength, and ductility enhancements for columns after the retrofitting process.

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“…However, testing specimens under cyclic loads can provide more evidence to better understand the compression response and to evaluate its ductility during an event having loading and unloading phases, such as earthquakes. The number of studies focusing on the FRP confinement of concrete members under cyclic axial loads is relatively low (Lam et al 2006;Ilki et al 2008;Lam and Teng 2009;Bai et al 2014;Demir et al 2015;Li and Wu 2015;Yu et al 2015;Cao et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Cyclic Compressive Behavior of Hybrid FRP-Confined Concrete

2021

Self Cite

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The aim of this study is to define the cyclic axial behavior of hybrid FRP (fiber reinforced polymer)-confined concrete based on the results of an experimental study presented here. Two different types of fiber sheets with different ultimate tensile strain capacities were used together in a suitable epoxy resin matrix to confine concrete. The inner and outer jackets of the concrete confinement were constituted with carbon (or glass) sheets with a relatively low tensile strain capacity and polyethylene terephthalate (PET) sheets with a high tensile strain capacity. PET fibers, which are a relatively new type of fiber, are made from recycled plastics. By varying the number of layers of the outer fiber sheet, different combinations were formed for the hybrid jackets. To characterize the cyclic axial behavior of hybrid FRP-confined concrete, experimental data were utilized to obtain the axial stress-strain relationship and dilation behavior. Based on the results, a stress-strain model for the envelope curve of the cyclic response of hybrid FRP-confined concrete is proposed.

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Cyclic Stress–Strain Relationships of FRP Confined Concrete Members

Cited by 12 publications

References 30 publications

Unified cyclic stress‐strain model for FRP‐confined concrete circular, square and rectangular prisms

Unified cyclic stress‐strain model for FRP‐confined concrete circular, square and rectangular prisms

Software development for retrofitting columns with FRP composites: A case study

Cyclic Compressive Behavior of Hybrid FRP-Confined Concrete

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