Experimental and numerical study of the behaviour of heat-damaged RC circular columns confined with CFRP fabric

Al-Kamaki, Yaman S.S.; Al-Mahaidi, Riadh; Bennetts, Ian

doi:10.1016/j.compstruct.2015.07.116

Cited by 39 publications

(15 citation statements)

References 29 publications

(35 reference statements)

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“…Losses of 55% in axial strength of rectangular (100 9 170 9 1000 mm) RC columns that have been exposed to 500°C for 3 h were encountered by Al-Nimry et al (2013). Higher losses in axial strength of circular (/ 204 9 750 mm) RC columns heated to 800 and 1000°C for 2 h reaching up to 43 and 72%, respectively were also reported in literature (Al-Kamaki et al 2015). As expected, differences in specimen sizes and shapes, material properties and heating regimens have a clear effect on the residual strength of heated columns.…”

Section: Heat-damaged Specimensmentioning

confidence: 52%

“…As such, the numerous applications of FRP composites in repairing reinforced concrete (RC) structural elements have been widely investigated over the past three decades. Very few experimental investigations have recently examined the potential of using FRP composites to repair heatdamaged RC columns Bailey 2011a, b, 2012;Yaqub et al 2011Bisby et al 2011;Bailey and Yaqub 2012;Tahir et al 2013;Al-Nimry et al 2013;Roy et al 2014Roy et al , 2016Al-Kamaki et al 2015). Most of the test columns were unstressed during heating, cooling and testing despite the fact that columns are expected to be stressed up to 50% of their capacity during any fire incident.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the test columns were unstressed during heating, cooling and testing despite the fact that columns are expected to be stressed up to 50% of their capacity during any fire incident. To this end, Al-Kamaki et al (2015) applied an axial compressive loading of 30% of the maximum compressive strength at ambient temperature while exposing the test columns to elevated temperatures. Available research results Bailey 2011a, b, 2012;Yaqub et al 2011Bisby et al 2011;Bailey and Yaqub 2012;Tahir et al 2013;Al-Nimry et al 2013;Roy et al 2014Roy et al , 2016Al-Kamaki et al 2015) indicated that jacketing heat-damaged columns with unidirectional FRP sheets may, depending on the cross sectional shape, restore the axial strength of the columns.…”

Section: Introductionmentioning

confidence: 99%

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FRP Confinement of Heat-Damaged Circular RC Columns

Al-Nimry

Ghanem

2017

Int J Concr Struct Mater

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To investigate the effectiveness of using fiber reinforced polymer (FRP) sheets in confining heat-damaged columns, 15 circular RC column specimens were tested under axial compression. The effects of heating duration, stiffness and thickness of the FRP wrapping sheets were examined. Two specimen groups, six each, were subjected to elevated temperatures of 500°C for 2 and 3 h, respectively. Eight of the heat-damaged specimens were wrapped with unidirectional carbon and glass FRP sheets. Test results confirmed that elevated temperatures adversely affect the axial load resistance and stiffness of the columns while increasing their ductility and toughness. Full wrapping with FRP sheets increased the axial load capacity and toughness of the damaged columns. A single layer of the carbon sheets managed to restore the original axial resistance of the columns heated for 2 h yet, two layers were needed to restore the axial resistance of columns heated for 3 h. Glass FRP sheets were found to be less effective; using two layers of glass sheets managed to restore the axial load carrying capacity of columns heated for 2 h only. Confining the heatdamaged columns with FRP circumferential wraps failed in recovering the original axial stiffness of the columns. Test results confirmed that FRP-confining models adopted by international design guidelines should address the increased confinement efficiency in heat-damaged circular RC columns.

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Section: Heat-damaged Specimensmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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FRP Confinement of Heat-Damaged Circular RC Columns

Al-Nimry

Ghanem

2017

Int J Concr Struct Mater

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“…Due to the effect of bending moment, the axial load carrying capacity and the stiffness of the columns could reduce considerably. Consequently, finding an improved strengthening technique for RC columns under combined bending and axial compression is essential . High strength concrete (HSC) columns subjected to eccentric compression are prone to early spalling of concrete cover that can reduce its load carrying capacity as compared to that of columns with normal strength concrete .…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on hybrid strengthening of short reinforced concrete column elements under eccentric compression

Chellapandian

Prakash

Sharma

2019

Structural Concrete

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This work experimentally investigates the efficacy of hybrid strengthening technique using a combination of near‐surface mounted (NSM) carbon fiber laminates and externally bonded (EB) carbon fiber‐reinforced polymer (CFRP) wraps for short reinforced concrete (RC) columns under eccentric loads. The performance of the hybrid FRP strengthened column elements was compared with the members strengthened using only NSM CFRP laminates or only EB CFRP wraps. The behavior of columns without and with different types of strengthening under concentric and eccentric compression was also compared. The tests showed that the RC column elements upgraded using hybrid strengthening displayed significant improvement in both the stiffness and strength, especially under eccentric compression. The performance improvement was primarily due to the substantial contribution of NSM laminates to the bending resistance. Existing analytical models were used to validate the observed behavior. The analytical results obtained had a close match when compared to the experimental results.

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“…The experimental results proved that wrapping RCcolumns with FRP scheme improve the ultimate load carrying capacities and enhance the ductility. Al-Kamakiet al [20]carried outan experimental and numerical study on thebehaviour of heated RCcolumnsencased inCFRP. Also, El-Karmoty [21] carried out an experimental and theatrical study on the response ofthermal protection of RC retrofitted by GFRP overlays.Tettaand Dionysios [22] studied the performance of TRM and FRP wrapping in theshear strengthening of RC beams exposed to different levels of temperature.…”

Section: Introductionmentioning

confidence: 99%

Behavior of post and pre-heated RC short columns wrapped with ferrocement

Elhady

Elsayed

2018

The International Conference on Civil and Architecture Engineer

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In this work, experimental and numerical studies were carried out to investigate the behavior of pre-and post-heated RC short columns wrapped by ferrocement overlays. Ten RC columns were constructed and tested expermintally under axial load. The tested columns were divided into unheated columns, post-heated columns, post-heated columns repaired with ferrocement, and heated wrapped columns. All heated columns were heated at a temperature of 300 o C for 3 hours. The experimental results were utilized for validation of the finite element models which developed by using ANSYS 13 software package. Based on the experimental and numerical results it is suggested that an equation that could predict the ultimate load of pst heated RC short columns wrapped by ferrocement. Afterwards,a wide range of the analysis was conducted models were analyzed to observe the effect of other parametric studies on the enhancement of axial load of post-heated columns confined by ferrocement. The results of the design equation were mutually compared with both the experimental and numerical ones. The research proved that the repairing scheme has an efficiency in surpassing the failure load of and improving the ultimate strength of heated columns significantly. The results of both the finite element and the prediction of the equation gave a satisfactory agreement with experimental ones.

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Experimental and numerical study of the behaviour of heat-damaged RC circular columns confined with CFRP fabric

Cited by 39 publications

References 29 publications

FRP Confinement of Heat-Damaged Circular RC Columns

FRP Confinement of Heat-Damaged Circular RC Columns

Experimental investigations on hybrid strengthening of short reinforced concrete column elements under eccentric compression

Behavior of post and pre-heated RC short columns wrapped with ferrocement

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