Reliability assessment of axially loaded uPVC tube confined reinforced concrete columns

Woldemariam, Abraham Mengesha; Oyawa, Walter O.; Nyomboi, Timothy

doi:10.1016/j.istruc.2019.11.009

Cited by 11 publications

(4 citation statements)

References 30 publications

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“…1.1.3 Un-plasticized polyvinyl chloride (uPVC) tubes remaining formwork UPVC tubes protected reinforced concrete columns from chemical attacks, increased the corrosion resistance of steel in a harsh environment, and prevented the peeling of concrete cover. Also, the columns' strength, ductility, and energy absorption improved by lateral confinement of uPVC to the concrete column [37][38][39][40][41][42][43].…”

Section: Steel Tubementioning

confidence: 99%

Stay in Place Formwork, Encased Reinforced Concrete Column: A Review

Abbas,

Hassan,

Gorgis

2023

ETJ

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SIP formwork offers a cost-effective alternative to classic formwork systems, reducing construction expenses • The review covers various types of SIP formworks for columns, including PVC, CFRP, steel tubes, and composite material • The study explores the mechanical features and confinement efficiency of some SIP formwork types for RC columns • The provides valuable insights for future research in this field Formwork systems are required for almost all cast-in-place concrete construction.However, some forms cost too much, often exceeding 30% of the entire cost of the concrete construction. Thus, the stay-in-place (SIP) formwork, a premanufactured permanent constructional member that holds fresh concrete to the intended sizes and stays in the site to afford loads over the construction lifecycle, could be an auspicious alternative to the classic formwork procedure. Several types of stay-inplace (SIP) formworks for columns have been reviewed, like PVC tubes, CFRP, steel tubes, and the composite of two or more types of stay-in-place (SIP) formwork used together. Moreover, some types of concrete and mortar used as stay-in-place (SIP) formwork have been reviewed. The mechanical, restrain, and deformability characteristics of several types of stay-in-place (SIP) formwork system for concrete columns is discussed. Further, the effect of change in the thickness of several kinds of stay-in-place formworks is highlighted. The impact of the change in the strength level of the core of concrete-filled stay-in-place formworks on the confinement efficiency of stay-in-place formwork is also investigated. Finally, the recommendations for futurity researchers in this area are introduced.

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Section: Steel Tubementioning

confidence: 99%

Stay in Place Formwork, Encased Reinforced Concrete Column: A Review

Abbas,

Hassan,

Gorgis

2023

ETJ

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“…Confronted to measurement uncertainties and variabilities (Shali and Naderpour, 2021; Woldemariam, et al , 2020), in particular the mechanical and geometric parameters (Si Salem et al , 2015; Doran et al , 2014), reliability and probability approaches of confined concrete columns have become primordial to assess the safety margin of such structures (Ayazian et al , 2021; Chen et al , 2021a, 2021b; Ahmad and Raza, 2020; Mansouri et al , 2016; Khun Ma et al , 2019). In this connection, Woldemariam et al (2020) have used the Monte Carlo simulation to evaluate the failure probability and reliability of the strength reduction factor of confined concrete columns with unplasticized polyvinyl chloride tube. Using the same subset simulation method, Chen et al (2021a, 2021b) recommended probabilistic prediction and explicit databases for adjustments and fitting of deterministic models for strength and strain enhancement in external wrapping of CFRP on reinforced concrete (RC) columns.…”

Section: Introductionmentioning

confidence: 99%

Experimental behavior and reliability of predamaged concrete columns externally repaired with FRP spiral strips under axial compression

Ahmed

Salem²,

Taleb³

et al. 2022

WJE

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Purpose This paper aims to investigate the experimental behavior and the reliability of concrete columns repaired using fiber-reinforced polymers (FRPs) under axial compression loading. The expression of the ultimate axial resistance was assessed from the experimental data of damaged concrete cylinders repaired by externally bonded double-FRP spiral strips. Design/methodology/approach The tested columns bearing capacity mainly depends of the elasticity modulus of both damaged and undamaged concrete have been considered in addition to the applied load and the cylinder diameter as random variables in the expression of the failure criterion. The reliability indicators were assessed using first order second moment method. Findings The emphasized test results, statistically fitted show that the strength has been retrofitted for all repaired specimens whatever the degree of initial damage. However, the gain in axial strength is inversely proportional to the degree of damage. Originality/value The efficiency of a new FRP repair procedure using double-spiral strips was studied. This research provides a technical and economical solution for retrofitting existing concrete columns. Finally, the random character of the variables that govern the studied system shows the accuracy and safety of the proposed original design.

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“…The three composite systems increased the ultimate load resistance capacity of slender columns by 36%, 43% over its equivalent steel-reinforced columns without plastic tube confinement. When used as a plastic pour in form, Woldemariam et al [17] proposed a strength reduction factor (ϕ) of 0.75 for CFPT columns instead of 0.65 mandated by ACI 318-14. The material and labor cost makes the application of FRP in some construction applications less economical.…”

Section: Introductionmentioning

confidence: 99%

Strength of Concrete-Filled Plastic Tube Stub Columns Using a Normalized Stiffness Approach

Abdulla

2021

AMR

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The polymeric plastic tube can encase concrete and provide an external shell for confining and insulating concrete core from the impact of the surrounding environment. The effect of the tube and concrete strength on the concrete-filled plastic tubes (CFPT) stub columns specimens was investigated. Test results show that the tube provides passive confinement to the concrete core, which increases both the maximum peak load and the ultimate strain capacities. However, the tube has low stiffness, which affects its confinement capacity and hindrance its applications for structural use. To examine the role of tube stiffness and express the strength of a concrete-filled plastic tube, a previously proposed normalized stiffness approach for both active and passive confinement of FRP-confined concrete was adopted for the present study. From the perspective of stiffness and to better understand the behavior of CFPT specimens under uniaxial compression loads, a database of recent studies were assembled combined with the results of the present study. Several existing strength models for FRP-confined concrete were also used to predict the mechanical strength of CFPT. Two models were proposed with good predictions of the experimental results of the database.

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Reliability assessment of axially loaded uPVC tube confined reinforced concrete columns

Cited by 11 publications

References 30 publications

Stay in Place Formwork, Encased Reinforced Concrete Column: A Review

Stay in Place Formwork, Encased Reinforced Concrete Column: A Review

Experimental behavior and reliability of predamaged concrete columns externally repaired with FRP spiral strips under axial compression

Strength of Concrete-Filled Plastic Tube Stub Columns Using a Normalized Stiffness Approach

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