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Behaviour of uni-axially loaded concrete-filled-steel-tube columns confined by external rings.

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Title: Behaviour of uni-axially loaded concrete-filled-steel-tube columns confined by external rings.
Authors: Lai, M. H.1, Ho, J. C. M.1
Source: Structural Design of Tall & Special Buildings. Apr2014, Vol. 23 Issue 6, p403-426. 24p.
Subjects: Concrete-filled tubes, Columns, Tall buildings, Ductility, Tuned mass dampers
Abstract: SUMMARY Concrete-filled-steel-tube (CFST) columns have been widely adopted for column construction of tall buildings due to its superior strength and ductility performance contributed by the composite action. However, this beneficial composite action cannot be fully developed at early elastic stage as steel dilates more than concrete and thereby causing imperfect interface bonding. Hence, it reduces the elastic strength and stiffness of the CFST columns. To resolve the problem, external confinement in the form of steel rings is proposed in this study to restrict the lateral dilation of concrete and steel at initial elastic stage. In this paper, CFST columns of various dimensions cast with normal-strength or high-strength concrete and installed with external steel rings were tested under uni-axial compression. From the results, it was evident that (a) the external steel rings could restrict the lateral dilation of CFST columns and improve the interface bonding condition and (b) externally confined CFST columns had uni-axial strength and stiffness larger than those of unconfined CFST columns. With the experimental results, an analytical model taking into account the confining effects of steel tube and rings has been developed to predict the uni-axial strength of ring-confined CFST columns. Copyright © 2012 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]
Copyright of Structural Design of Tall & Special Buildings is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Behaviour of uni-axially loaded concrete-filled-steel-tube columns confined by external rings.
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  Data: <searchLink fieldCode="JN" term="%22Structural+Design+of+Tall+%26+Special+Buildings%22">Structural Design of Tall & Special Buildings</searchLink>. Apr2014, Vol. 23 Issue 6, p403-426. 24p.
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  Data: <searchLink fieldCode="DE" term="%22Concrete-filled+tubes%22">Concrete-filled tubes</searchLink><br /><searchLink fieldCode="DE" term="%22Columns%22">Columns</searchLink><br /><searchLink fieldCode="DE" term="%22Tall+buildings%22">Tall buildings</searchLink><br /><searchLink fieldCode="DE" term="%22Ductility%22">Ductility</searchLink><br /><searchLink fieldCode="DE" term="%22Tuned+mass+dampers%22">Tuned mass dampers</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: SUMMARY Concrete-filled-steel-tube (CFST) columns have been widely adopted for column construction of tall buildings due to its superior strength and ductility performance contributed by the composite action. However, this beneficial composite action cannot be fully developed at early elastic stage as steel dilates more than concrete and thereby causing imperfect interface bonding. Hence, it reduces the elastic strength and stiffness of the CFST columns. To resolve the problem, external confinement in the form of steel rings is proposed in this study to restrict the lateral dilation of concrete and steel at initial elastic stage. In this paper, CFST columns of various dimensions cast with normal-strength or high-strength concrete and installed with external steel rings were tested under uni-axial compression. From the results, it was evident that (a) the external steel rings could restrict the lateral dilation of CFST columns and improve the interface bonding condition and (b) externally confined CFST columns had uni-axial strength and stiffness larger than those of unconfined CFST columns. With the experimental results, an analytical model taking into account the confining effects of steel tube and rings has been developed to predict the uni-axial strength of ring-confined CFST columns. Copyright © 2012 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]
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  Label:
  Group: Ab
  Data: <i>Copyright of Structural Design of Tall & Special Buildings is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/tal.1046
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      – Code: eng
        Text: English
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        PageCount: 24
        StartPage: 403
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      – SubjectFull: Concrete-filled tubes
        Type: general
      – SubjectFull: Columns
        Type: general
      – SubjectFull: Tall buildings
        Type: general
      – SubjectFull: Ductility
        Type: general
      – SubjectFull: Tuned mass dampers
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              Text: Apr2014
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