Experimental Investigation of Concrete Columns Enhanced by PVC Tubes

Raheemah, Murtaza Allawi; Resan, Sa’ad Fahad

doi:10.1088/1757-899x/584/1/012047

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…In the present study, the average peak strain of CFPT specimens was found to be εfu=0.0078 and substituting in Eqn. (7):…”

Section: Cfptmentioning

confidence: 99%

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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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“…In the present study, the average peak strain of CFPT specimens was found to be εfu=0.0078 and substituting in Eqn. (7):…”

Section: Cfptmentioning

confidence: 99%

“…The capacity of CFPT specimens [7] incorporating 5% silica fume was explored in a composite mode where loading applied to the entire composite system and confining mode where loading applied to the concrete core only. The composite mode columns showed more enhancements in strength, 2.25 to 1.56, than those of confining mode, 2.07 to 1.55.…”

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 results showed the formation of two peak strains with a compression strain-softening in the falling ranch. To predicate the plastic capacity of PTCI columns with two different mechanisms, composite mode and confining mode, two series of short PTCI specimens were tested, and material failure dominated the test results [8]. Double skin PTCI specimens under axial compression loads were investigated [9], showing considerable ductility enhancement.…”

Section: Introductionmentioning

confidence: 99%

Deformations of a plastic tube with concrete-infill under direct load

Abdulla¹

2021

CEBEL

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Confinement of concrete columns can be an effective means of enhancing structural members' deformation—alternative materials such as uPVC tube show elastic-plastic behavior with considerable elongations at failure. The material ductility features significant deformations that usually considered to be belonging to the set of mechanical properties. The tube can be applied for encasing concrete, thereby influencing the deformability capacity of a column. The current work aims to evaluate the axial strain of plastic tubes with concrete-infill (PTCI) specimens tested under uniaxial compression load. A strain model was developed for PTCI specimens using a normalized confinement stiffness procedure, based on a database of experimental results from recent studies 2019-2020 and those of the present study. Five existing FRP-confined concrete models and the developed model were employed to predict PTCI columns' strain, and the predictions were compared with experimental results in the database. Three statistical indexes were used to evaluate the proposed and the three existing FRP-confined concrete strain models' performance. The indexes included: Average absolute relative error (AAE), Normalized root-mean-square error (NRMSE), and coefficient of correlation (R2). The comparison shows the proposed model to give more close prediction to the experimental test data and the comprehensive database to yield the lowest average absolute error (AAE). The root means square error (RMSE) compared with other models in the present study.

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