New theoretical model for SSTT-confined HSC columns

Khun, Chau; Awang, Abdullah Zawawi; Omar, Wahid

doi:10.1680/macr.13.00230

Cited by 15 publications

(5 citation statements)

References 18 publications

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“…However, the increment in maximum load of HSC columns was found to decrease with the increase in confinement level, showing no proportional increment in maximum load with confinement level. A similar observation has been reported by Jiang and Teng , Ma et al and Johansson , indicating that there is a threshold strength improvement due to external confinement. 3.The post‐tensioning steel‐strap confinement enhanced the performance of the columns by postponing the crushing of concrete on the compressive side, which means it increased the column ductility. …”

Section: Discussionsupporting

confidence: 89%

Flexural capacity enhancement of rectangular high‐strength concrete columns confined with post‐tensioned steel straps: experimental investigation and analytical modelling

Khun

Awang

Omar

et al. 2016

Structural Concrete

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Load carrying capacity and deformability of concrete column can be substantially enhanced after confined with post-tensioned steel-straps. As the interests in the high-strength concrete (HSC) grow among structural engineers and researchers due to its superior performance, this confining technique is extended to HSC columns with the hope that it can eliminate the undesired properties of HSC especially its brittleness.However, experimental studies in confined HSC columns subjected to eccentric loads is comparatively limited. It can be observed in the past research that most of the studies in external confinement were conducted on small-scale normal-strength concrete (NSC) cylinders subjected to concentric loads. Since most of the columns are subjected to eccentric loads in reality, the scarcity of test data has prevented the full potential use of this confining technique. In this paper, this confining technique is termed as steel-strapping tensioning technique (SSTT) hereafter for brevity. Nine HSC columns were tested under eccentric loads. The specimens were grouped into three groups with each group had an unconfined HSC column as control specimen, a two layer SSTT-confined HSC column and a four layer confined HSC column. The experimental results show that the flexural capacities of HSC columns can be enhanced with SSTT. The deformability of confined HSC columns is significantly improved with the confinement provided.

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Section: Discussionsupporting

confidence: 89%

Flexural capacity enhancement of rectangular high‐strength concrete columns confined with post‐tensioned steel straps: experimental investigation and analytical modelling

Khun

Awang

Omar

et al. 2016

Structural Concrete

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“…Due to the economic consideration, mostly the latter will be chosen as it requires less time, cheaper, easier and most importantly, it is highly effective. Past research works have proven that rapid repairing using confinement is effective in restoring the original strength of the concrete columns [7][8][9][10]. Besides, it was also reported that the confinement restored the ductility of damaged concrete as well [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effects of Predamaged Level on Confined HSC Columns

et al. 2017

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Abstract. In the design of repair works for damaged concrete, an accurate and representative stress-strain model is of important. The stress-strain model for damaged high strength concrete (HSC) repaired with posttensioning steel straps confinement yet available, although the confining method has been proven to be effective in improving the performance of non-damaged HSC. A series of experimental test was carried out to investigate the stress-strain relationships of such concrete. A total of 24 HSC cylinders were compressed until certain damaged levels, then repaired by using steel straps. Two important parameters have been identified to have significant effects on the stress-strain relationship of such repaired concrete, namely the confining volumetric ratio and damaged levels. These parameters were incorporated into the development of stressstrain model, which later was shown to correlate well with the experimental results. This paper also has evidenced that existing stressstrain models of damaged concrete are not suitable to be directly applied to the design of repair works using post-tensioning steel straps confinement that produce external lateral stress on damaged columns before subsequent loading applied.

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“…Recently, the suitability of using steel straps as confining material has been experimentally investigated [1][2][3][4][5]. The steel straps used in these studies are recycled steel straps which are commonly used as packing strands for exporting good crates.…”

Section: Introductionmentioning

confidence: 99%

Innovative Concrete Repairing Technique Using Post Tensioning Steel Straps

et al. 2017

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Abstract. In this paper, innovative technique using low-cost recycled steel straps confinement to repair load-induced damaged high-strength concrete (HSC) columns were studied. This paper explains the effects of repairing technique using post tensioning steel straps. A series of experimental test was carried out to investigate the stress-strain relationships of such concrete. A total of 6 HSC columns were compressed 50% of their ultimate strength, then repaired by using steel straps. The proposed repairing technique significantly improved the performance of damaged concrete columns, in both strength and ductility. It was evidenced from this study that the steel strapping confining technique is effective in repairing of damaged HSC columns but ensured reasonable operating costs.

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New theoretical model for SSTT-confined HSC columns

Cited by 15 publications

References 18 publications

Flexural capacity enhancement of rectangular high‐strength concrete columns confined with post‐tensioned steel straps: experimental investigation and analytical modelling

Flexural capacity enhancement of rectangular high‐strength concrete columns confined with post‐tensioned steel straps: experimental investigation and analytical modelling

Effects of Predamaged Level on Confined HSC Columns

Innovative Concrete Repairing Technique Using Post Tensioning Steel Straps

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