FRP Confinement of Heat-Damaged Circular RC Columns

Al-Nimry, Hanan; Ghanem, Aseel Mohammad

doi:10.1007/s40069-016-0181-4

Cited by 31 publications

(8 citation statements)

References 60 publications

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“…Natural-flax fabric reinforced epoxy polymer material increases in peak load and fracture energy by 6-layer and it is 374 % and 4660 % and also S.E.M analysis show perfect bonding between materials [23]. Elevated temperatures should result the stress parameters in between FRP and concrete [24]. Round edged concrete members will help to decreases the stresses at the corners [25].…”

Section: Frp Strengthened Concrete Columnsmentioning

confidence: 96%

Art-of-review on CFRP Wrapping to Strengthen Compressive and Flexural Behavior of Concrete

Komma¹,

Nerella²,

Madduru³

2019

RCMA

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Strengthening of reinforced concrete structures is given top priority in construction sector across the world. Ageing and load pattern changes will affect the stability of structure may be reduced. In this case, Fibre-Reinforced Polymer (FRP) materials are recognized as vital constituents to solve stability issues of the modern concrete structures. The purpose of present constructive studies of various techniques for FRP retrofit concrete structures because, the FRP material has improves the structural performance in terms of stability, stiffness, strength and durability such that the Fibre-Reinforced Polymers wrapping is one of the techniques to regain the strength of a concrete structures. By various researchers the different wrappings techniques are used to regain the strength and also enhanced the durability of the structure. This paper focuses mainly on various wrapping techniques of FRP sheets for external strengthening of RC structures such as reinforced circular columns, square beams, columns and column-beam joints.

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Section: Frp Strengthened Concrete Columnsmentioning

confidence: 96%

Art-of-review on CFRP Wrapping to Strengthen Compressive and Flexural Behavior of Concrete

Komma¹,

Nerella²,

Madduru³

2019

RCMA

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“…Then they developed a design-oriented model to predict the compressive strength of unheated and heated concrete columns. Al-Nimry and Ghanem (2017) tested 15 FRP-confined specimens to investigate the effectiveness of FRP jackets in strengthening the heated concrete columns. They subjected their specimens to the temperature of 500°C for two and 3 h and then wrapped them by GFRP and CFRP composites.…”

Section: Introductionmentioning

confidence: 99%

Behavior and modeling of post-heated circular concrete specimens repaired with fiber-reinforced polymer composites

Elhamnike

Abbaszadeh

Razavinasab

et al. 2021

Advances in Structural Engineering

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Exposure of buildings to fire is one of the unexpected events during the life of the structure. The heat from the fire can reduce the strength of structural members, and these damaged members need to be strengthened. Repair and strengthening of concrete members by fiber-reinforced polymer (FRP) composites has been one of the most popular methods in recent years and can be used in fire-damaged concrete members. In this paper, in order to provide further data and information about the behavior of post-heated circular concrete columns confined with FRP composites, 30 cylindrical concrete specimens were prepared and subjected under four exposure temperatures of 300, 500, 700, and 900. Then, specimens were repaired by carbon fiber reinforced polymer composites and tested under axial compression. Results indicate that heating causes the color change, cracks, and weight loss of concrete. Also, with the increase of heating temperature, the shape of stress–strain curve of FRP-retrofitted specimens will change. Therefore, the main parts of the stress–strain curve such as ultimate stress and strain and the elastic modulus will change. Thus, a new stress–strain model is proposed for post-heated circular concrete columns confined by FRP composites. Results indicate that the proposed model is in a good agreement with the experimental data.

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“…The columns strengthened using CFRP confinement had large stress concentration at the corners and failed by local debonding. Al-Nirmy and Ghanem [10] researched the behaviour of pre-damaged RC columns due to high temperatures and shown that the damaged columns when retrofitted using CFRP were able to increase the axial load but with the reduced ductility. Fukuyama et al [11] investigated the behaviour of RC columns under cyclic shear loading and concluded that CFRP strengthening was able to improve the performance of the damaged column than the control specimens.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cyclic Damage on the Performance of RC Square Columns Strengthened Using Hybrid FRP Composites under Axial Compression

Chellapandian

Jain

Prakash

et al. 2019

Fibers

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The effectiveness of hybrid fibre-reinforced polymer (FRP) strengthening is evaluated for rapid repair of the pre-damaged plain concrete (PC) and reinforced concrete (RC) columns. The objective of this study is to understand the efficiency of hybrid technique for completely restoring the initial stiffness, load carrying capacity and ductility of pre-damaged columns under cyclic compression loads. Two series of PC and RC square columns were cast. The columns were pre-damaged by loading up to 80% of peak load capacity for three cycles under pure compression. After cyclic damage, the columns were strengthened with two techniques, namely (a) near-surface mounted (NSM) carbon FRP (CFRP) laminates and (b) hybrid FRP technique, which uses a combination of NSM and externally bonded (EB) CFRP fabric. Analytical modelling was carried out for predicting the behaviour of columns with initial cyclic pre-damage. Additionally, a phased three-dimensional nonlinear finite element (FE) analysis was performed to validate the behaviour of pre-damaged columns with different strengthening techniques. Test results show that cyclic pre-loading and resulting damage causes a reduction in axial stiffness of all damaged specimens. Hybrid strengthening completely restored the stiffness and strength under compression. Prediction of analytical and FE analysis correlated well with the tests.

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FRP Confinement of Heat-Damaged Circular RC Columns

Cited by 31 publications

References 60 publications

Art-of-review on CFRP Wrapping to Strengthen Compressive and Flexural Behavior of Concrete

Art-of-review on CFRP Wrapping to Strengthen Compressive and Flexural Behavior of Concrete

Behavior and modeling of post-heated circular concrete specimens repaired with fiber-reinforced polymer composites

Effect of Cyclic Damage on the Performance of RC Square Columns Strengthened Using Hybrid FRP Composites under Axial Compression

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