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Behaviour and design of circular hollow section steel columns strengthened by infilling concrete under preload
ABSTRACT The objective of this work is to develop design guidance for existing hollow steel columns that are retrofitted by infilling concrete into the tubes. The primary challenge is the unknown effect of the existing preload on the steel columns prior to the concrete infill. Composite performance and buckling behaviour of circular hollow section (CHS) steel columns strengthened by infilling concrete under preload was experimentally and numerically investigated in this study. A total of 34 CHS steel columns were tested under pin-ended boundary conditions, and the overall buckling failure modes and corresponding ultimate buckling resistances were recorded. Prior to the member testing, material properties of the steel columns and the infilled concrete were attained. By means of the finite element (FE) software package ABAQUS, elaborate FE models for the CHS columns strengthened by infilling concrete were developed and validated against the obtained test results, which were further verified with other available test data. Using the validated FE models, systematic parametric studies were conducted to examine the influences of the major factors affecting the ultimate capacities of the CHS columns strengthened by infilling concrete, including preload ratios, steel and concrete strengths, steel ratios, initial global imperfections, eccentricity ratios and column slenderness ratios. The obtained test and numerical results were therefore utilised to develop design criteria for predicting the overall buckling resistance of CHS steel columns strengthened by infilling concrete. In view of the difficulty of determining the key parameters in practice and the uncertainty of the strengthening process, a new simplified design coefficient was proposed, taking into account the influence of the preload. It has been demonstrated that accurate and reasonable strength predictions can be provided by the proposed design method.
Highlights Experimental tests on 34 CHS steel columns strengthened by infilling concrete. Validated numerical modelling and parametric studies were carried out by ABAQUS. Newly developed design formulae for predicting the ultimate resistances of strengthened columns. Simplified reduction coefficient taking into the effect of existing preload was introduced.
Behaviour and design of circular hollow section steel columns strengthened by infilling concrete under preload
ABSTRACT The objective of this work is to develop design guidance for existing hollow steel columns that are retrofitted by infilling concrete into the tubes. The primary challenge is the unknown effect of the existing preload on the steel columns prior to the concrete infill. Composite performance and buckling behaviour of circular hollow section (CHS) steel columns strengthened by infilling concrete under preload was experimentally and numerically investigated in this study. A total of 34 CHS steel columns were tested under pin-ended boundary conditions, and the overall buckling failure modes and corresponding ultimate buckling resistances were recorded. Prior to the member testing, material properties of the steel columns and the infilled concrete were attained. By means of the finite element (FE) software package ABAQUS, elaborate FE models for the CHS columns strengthened by infilling concrete were developed and validated against the obtained test results, which were further verified with other available test data. Using the validated FE models, systematic parametric studies were conducted to examine the influences of the major factors affecting the ultimate capacities of the CHS columns strengthened by infilling concrete, including preload ratios, steel and concrete strengths, steel ratios, initial global imperfections, eccentricity ratios and column slenderness ratios. The obtained test and numerical results were therefore utilised to develop design criteria for predicting the overall buckling resistance of CHS steel columns strengthened by infilling concrete. In view of the difficulty of determining the key parameters in practice and the uncertainty of the strengthening process, a new simplified design coefficient was proposed, taking into account the influence of the preload. It has been demonstrated that accurate and reasonable strength predictions can be provided by the proposed design method.
Highlights Experimental tests on 34 CHS steel columns strengthened by infilling concrete. Validated numerical modelling and parametric studies were carried out by ABAQUS. Newly developed design formulae for predicting the ultimate resistances of strengthened columns. Simplified reduction coefficient taking into the effect of existing preload was introduced.
Behaviour and design of circular hollow section steel columns strengthened by infilling concrete under preload
Yuan, H.X. (author) / Du, X.X. (author) / Shokouhian, M. (author) / Ye, J. (author) / Schafer, B.W. (author)
Journal of Constructional Steel Research ; 159 ; 415-427
2019-05-02
13 pages
Article (Journal)
Electronic Resource
English
Ultimate Load Capacity of Columns Strengthened under Preload
| British Library Conference Proceedings | 1999