Axial capacity of post-heated square columns wrapped with FRP composites

Yaqub, M.; Bailey, Colin; Nedwell, Paul

doi:10.1016/j.cemconcomp.2011.03.011

Cited by 55 publications

(23 citation statements)

References 22 publications

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“…For the normal condition of concrete, calcium hydroxide, Ca(OH) 2 , is created in the hydration process of cement, which is described by…”

Section: Neutralization Test Of Concretementioning

confidence: 99%

“…Furthermore, a reinforced concrete (RC) structure with proper reinforcement details can effectively redistribute loads from damaged region to undamaged components even if the part of the structure is severely damaged by fire. Therefore, it is not common for fire-damaged RC structures to completely collapse during or after an event of fire [2].…”

Section: Introductionmentioning

confidence: 99%

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A Case Study on the Rehabilitation of a Fire-Damaged Structure

Lee

et al. 2016

Applied Sciences

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This paper presents a case study on the rehabilitation of a fire-damaged structure and describes the results of a site investigation and tests, leading to a plan for the rehabilitation of the structure. The fire took place in the main control room of a thermal power plant and lasted about three hours until it was finally extinguished. To set up a rehabilitation plan for the damaged structure, a visual inspection of the damaged condition was first carried out, which was followed by analysis and on-site material tests indicating the degree of neutralization progress in the remaining structure. Specimens of damaged concrete and reinforcing bars were sampled and tested for their residual strengths. As a conclusion, two methods of rehabilitation were suggested considering the current condition of the structure and the sequence of construction.

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“…For the normal condition of concrete, calcium hydroxide, Ca(OH) 2 , is created in the hydration process of cement, which is described by…”

Section: Neutralization Test Of Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Case Study on the Rehabilitation of a Fire-Damaged Structure

Lee

et al. 2016

Applied Sciences

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“…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%

“…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. FRP jacketing has been found efficient in enhancing the ductility, deformation and energy dissipation capacities of heat-damaged columns.…”

Section: Introductionmentioning

confidence: 99%

“…To restore the original axial strength of square heat-damaged RC columns; Al-Nimry et al (2013) proposed the use of externally bonded longitudinal FRP plates confined with circumferential carbon FRP sheets over the full column height. Glass and carbon FRP jacketing showed no significant effect on the axial stiffness of wrapped heatdamaged columns Bailey 2011a, b, 2012;Yaqub et al 2011Bisby et al 2011;Al-Nimry et al 2013). proposed the use of both ferrocement and FRP jackets to restore the strength, stiffness and ductility of fire-damaged RC 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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