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Steel and Composite Structures
  Volume 45, Number 1, October10 2022 , pages 051-66
DOI: https://doi.org/10.12989/scs.2022.45.1.051
 


Axial load-strain relationships of partially encased composite columns with H-shaped steel sections
Papan Bangprasit, Worakarn Anuntasena and Akhrawat Lenwari

 
Abstract
    This paper presents the axial compression behavior of partially encased composite (PEC) columns using H-shaped structural steel. In the experimental program, a total of eight PEC columns with H-shaped steel sections of different flange and web slenderness ratios were tested to investigate the interactive mechanism between steel and concrete. The test results showed that the PEC columns could sustain the load well beyond the peak load provided that the flange slenderness ratio was not greater than five. In addition, the previous analytical model was extended to predict the axial load-strain relationships of the PEC columns with H-shaped steel sections. A good agreement between the predicted load-strain relationships and test data was observed. Using the analytical model, the effects of compressive strength of concrete (21 to 69 MPa), yield strength of steel (245 to 525 MPa), slenderness ratio of flange (4 to 10), and slenderness ratio of web (10 to 25) on the interactive mechanism (Kh = confinement factor for highly confined concrete and Kw = reduction factor for steel web) and ductility index (DI = ratio between strain at peak load and strain at proportional load) were assessed. The numerical results showed that the slenderness of steel flange and yield strength of steel significantly influenced the compression behavior of the PEC columns.
 
Key Words
    analytical model; composite column; compressive strength; confined concrete; partial encasement
 
Address
Papan Bangprasit, Worakarn Anuntasena and Akhrawat Lenwari:Composite Structures Research Unit, Department of Civil Engineering, Faculty of Engineering,
Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, Thailand 10330
 

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