Behaviour of Rubberized Concrete Short Columns Confined by Aramid Fibre Reinforced Polymer Jackets Subjected to Compression

Oprişan, Gabriel; Enţuc, Ioana-Sorina; Mihai, Petru; Toma, Ionuţ-Ovidiu; Ţăranu, Nicolae; Budescu, Mihai; Munteanu, Vlad

doi:10.1155/2019/1360620

Cited by 10 publications

(6 citation statements)

References 52 publications

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“…Existing studies show that the section shape of the specimens is one of the important factors affecting the compressive strength of FRP-confined normal concrete [ 32 , 33 , 34 , 35 , 36 ], FRP-confined rubber concrete [ 13 , 16 ], and FRP-confined recycled concrete [ 37 , 38 ]. The influence of the specimen section shape on FRP confinement can be modified by the parameter corner radius ratio (2 r / b ) [ 35 , 36 ], therefore Equation (4) can be rewritten as:

where

is a coefficient related to the rubber content, which can be written as

, and a 1 , a 2 , a 3 , and a 4 are the parameters that need to be determined.…”

Section: Analytical Modelingmentioning

confidence: 99%

Unified Stress–Strain Model of FRP-Confined Square and Circle Rubber Concrete Columns

et al. 2022

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Studying the stress–strain relationship of fiber-reinforced polymer (FRP)-confined rubber concrete (RuC) plays an important role in its application in engineering projects. Most of the existing stress–strain relationship models are established based on the test data of FRP-confined rubber concrete with circular cross-sections, and the effect of the section shape is not considered. Therefore, an analysis-oriented stress–strain model of FRP-confined circular and square rubber concrete columns was studied in this paper for the first time. A database that includes the rubber particle content and section shape on the peak stress-peak strain and axial–lateral strain relationship of FRP-confined rubber concrete was established by collecting 235 test data from the literature. By modifying the key parameters in the existing FRP-confined normal concrete stress–strain relationship model, a unified stress–strain relationship model of FRP-confined RuC with circular and square columns is established. The proposed model is verified, and a good accuracy of the model is proven.

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where

is a coefficient related to the rubber content, which can be written as

, and a 1 , a 2 , a 3 , and a 4 are the parameters that need to be determined.…”

Section: Analytical Modelingmentioning

confidence: 99%

Unified Stress–Strain Model of FRP-Confined Square and Circle Rubber Concrete Columns

et al. 2022

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“…From the very beginning, it was clear that adding rubber aggregates to concrete resulted in a decrease in the values of mechanical properties [6]. Since strength and elastic properties are the main parameters considered in the design process of structural elements, rubberized concrete has seen limited application in this direction unless special confining solutions were applied [7][8][9]. However, significant deformability was achieved for a material that is inherently brittle [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations on the Long Term Material Properties of Rubberized Portland Cement Concrete

et al. 2021

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The paper presents the results of a research work aimed at assessing the long-term strength and elastic properties of rubberized concrete. The parameters of the research were the rubber replacement of fine aggregates and the age of testing the specimens. Compressive and splitting tensile strength of concrete cylinders were obtained at the age of 5 years, coupled with the static and dynamic modulus of elasticity of all concrete specimens. Additionally, the material damping coefficient was assessed by means of non-destructive tests. The density of the rubberized concrete decreases with the percentage replacement of natural sand by rubber aggregates. A significant drop in the values of density after 5 years was observed for specimens made with rubberized concrete. The static and the dynamic moduli of elasticity decrease with the increase in rubber content. A similar trend is observed for the compressive and tensile splitting strength.

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“…Columns are considered to play a significant role in the overall stability of structures during seismic events because they are expected to resist both the lateral cyclic loads induced by the earthquake and the gravitational loads. FRP composite materials proved their effectiveness [6] in strengthening the already damaged columns due to past seismic events, as demonstrated by a series of recent shake table tests [7,8]. The advancement of knowledge regarding the seismic behaviour of RC frame structures is slowed by the lack of experimental data documenting the realistic responses of structures tested under seismic scenarios and is mainly caused by the expensive nature of the involved testing equipment (shake tables) as well as by the complexity of such experimental investigations.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on the seismic performance of a scaled-down RC frame structure pre- and post-strengthening with composite membrane

Toma¹,

Enţuc²,

Petcu³

et al. 2021

1st Croatian Conference on Earthquake Engineering

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Due to the rapid expansion of urban areas around the world and the ever-increasing number of reinforced concrete (RC) structures serving a variety of functional purposes, their behaviour in case of major seismic events has become of great interest to researchers and decision makers alike. Although initially designed to ensure certain levels of safety in case of earthquakes, the damage accumulated in a reinforced concrete structure during its lifetime due to seismic events will ultimately require its strengthening in order to comply with the new seismic design regulations. The paper presents the results obtained by numerical analyses of the seismic performance of a scaled-down RC frame structure retrofitted with a composite membrane. The 1/3-scale symmetric structure was designed according to the specifications of the European norms and following the guidelines in the national annex for Romania. The RC frame structure was previously damaged during a series of shake table tests. The numerical model was developed based on the initial undamaged state of the frame structure and was validated by comparing the numerical results to the experimentally obtained results. A non-linear time history analysis (THA) was used in order to account for the damage accumulation in the model from one seismic record to the next. Modal analysis was run after each non-linear THA to determine any change in the fundamental period of vibration. The seismic record consisted in an artificial earthquake generated according to Eurocode 8 using soil type C spectrum, the amplitude of which was gradually increased from one loading scenario to the next. The numerical model was then updated to include the effect of strengthening by means of composite membrane. The obtained results were used to estimate the outcomes of a new series of shake table tests on the strengthened model following the same loading set-up in terms of seismic motions.

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Behaviour of Rubberized Concrete Short Columns Confined by Aramid Fibre Reinforced Polymer Jackets Subjected to Compression

Cited by 10 publications

References 52 publications

Unified Stress–Strain Model of FRP-Confined Square and Circle Rubber Concrete Columns

Unified Stress–Strain Model of FRP-Confined Square and Circle Rubber Concrete Columns

Experimental Investigations on the Long Term Material Properties of Rubberized Portland Cement Concrete

Numerical investigations on the seismic performance of a scaled-down RC frame structure pre- and post-strengthening with composite membrane

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