Cyclic performance of fire-damaged concrete-filled steel tubular beam–columns repaired with CFRP wraps

Tao, Zhong; Han, Lin‐Hai; Zhuang, Jinping

doi:10.1016/j.jcsr.2007.02.004

Cited by 45 publications

(10 citation statements)

References 13 publications

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“…is new structure could be used in high-rise buildings and bridges in seismic areas. Later, many researchers focused on the ultimate bearing capacity and working mechanisms, and compression and bending experiments were implemented [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Research on Dynamic Response of Concrete‐Filled Steel Tube Columns Confined with FRP under Blast Loading

Dong

Zhao

Zhang

et al. 2019

Shock and Vibration

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Recently, a concrete-filled steel tube confined with fiber-reinforced polymer (FRP) has become a hot research issue as a new type of structure. These studies mainly focus on its static performance and seismic and impact behaviour, with little research on its blast resistance performance. In this study, the dynamic response of concrete-filled steel tube columns confined with FRP under blast loading was investigated. Numerical analysis was implemented using multimaterial ALE method in the finite element analysis program LS-DYNA. The proposed numerical model was validated by the SDOF result and available experimental data. And the effects of the number of FRP layers, concrete strength, and cross section were also discussed in detail based on the proposed numerical model. The results indicate that the constraints of FRP effectively enhance the blast resistance of the column, and the vulnerable parts mainly occur at the middle and two ends of the column. The blast resistance of the column can be enhanced by increasing the number of FRP layers or concrete strength. These results could provide a certain basis for blast resistance design of concrete-filled steel tubes confined with FRP.

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Section: Introductionmentioning

confidence: 99%

Research on Dynamic Response of Concrete‐Filled Steel Tube Columns Confined with FRP under Blast Loading

Dong

Zhao

Zhang

et al. 2019

Shock and Vibration

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“…This means that the specimens became more ductile after fire exposure. Other researchers like Tao et al (2008) [32]and Tao & Han (2007) [33]also found out that the ductility of CFST columns after fire exposure increases. This can be attributed to changes in the properties of steel and concrete after being exposed to high temperature.…”

Section: Iscee 2016mentioning

confidence: 93%

Concrete-Filled Double Skin Steel Tubular Columns Exposed to ASTM E-119 Fire Curve for 60 and 90 Minutes of Fire

Zuki

Shahidan

Choong³

et al. 2017

MATEC Web Conf.

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Concrete-filled double skin steel tubular (CFDST) columns with outer steel tubes varying in diameter and thickness were exposed to ASTM E-119 fire curve for 60 and 90 minutes. All specimens (control and heated) failed by outward local buckling of outer steel tube, crushing of concrete and outward and inward buckling of inner steel tube. Residual Strength Index (RSI), secant stiffness and Ductility Index (DI) were calculated in order to compare the performance of control and fire-damaged CFDST columns. It was found that specimens with 90 minutes of fire exposure time possessed highest RSI. Meanwhile, secant stiffness seems to decrease with increased exposure time. And finally, CFDST columns became more ductile after being heated.

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“…Ductility is defined as the ability of material to plastically deform without any breaking. Ductility index of the control and CFRP strengthened beams were found as per Tao et al (2006) and shown in Figs 20 to 22. It has been found that the control specimen exhibited more ductile nature compared to CFRP strengthened beams and also the ductility of the strengthened specimens decreased when the number of FRP layers increased.…”

Section: Effect On Ductility Responsementioning

confidence: 99%

“…The test results showed that the load-carrying capacity and the longitudinal stiffness of CFRP-repaired CFST stub columns increased while their ductility decreased with the increasing number of CFRP layers. In another study, Tao et al (2006) repaired the fire-exposed CFST beams and columns by unidirectional CFRP composites. The test results showed that the load-bearing capacity was enhanced by the fibre jackets to some extent, while the influence of CFRP repair on stiffness was not apparent.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of CFST Members Under Compression Externally Reinforced by CFRP Composites

Sundarraja¹,

Prabhu²

2013

Journal of Civil Engineering and Management

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This research is aimed at investigating the structural improvements of concrete filled steel tubular (CFST) sections with normal strength concrete externally bonded with fibre reinforced polymer (FRP) composites. For this study, compact mild steel tubes were used with the main variable being FRP characteristics. Carbon fibre reinforced polymer (CFRP) fabrics was used as horizontal strips (lateral ties) with several other parameters such as the number of layers and spacing of strips. Among twenty one columns, eighteen were externally bonded by CFRP strips having a constant width of 50 mm with a spacing of 20 mm and 40 mm and the remaining three columns were unbounded. Experiments were undertaken until column failure to fully understand the influence of FRP characteristics on the compressive behaviour of square CFST sections including their failure modes, axial stress-strain behaviour, and enhancement in load carrying capapcity. It was found that the external bonding of CFRP strips provides external confinement pressure effectively and intended to delay the local buckling of steel tube and also to improve the load carrying capacity further.

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Cyclic performance of fire-damaged concrete-filled steel tubular beam–columns repaired with CFRP wraps

Cited by 45 publications

References 13 publications

Research on Dynamic Response of Concrete‐Filled Steel Tube Columns Confined with FRP under Blast Loading

Research on Dynamic Response of Concrete‐Filled Steel Tube Columns Confined with FRP under Blast Loading

Concrete-Filled Double Skin Steel Tubular Columns Exposed to ASTM E-119 Fire Curve for 60 and 90 Minutes of Fire

Behaviour of CFST Members Under Compression Externally Reinforced by CFRP Composites

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