Steel and Composite Structures

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Experimental and analytical investigation of composite columns made of high strength steel and high strength concrete

  • Lai, Binglin (Department of Civil and Environmental Engineering, National University of Singapore) ;
  • Liew, J.Y. Richard (Department of Civil and Environmental Engineering, National University of Singapore) ;
  • Xiong, Mingxiang (Protective Structures Centre, School of Civil Engineering, Guangzhou University)
  • Received : 2019.01.24
  • Accepted : 2019.09.25
  • Published : 2019.10.10
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Abstract

Composite columns made of high strength materials have been used in high-rise construction owing to its excellent structural performance resulting in smaller cross-sectional sizes. However, due to the limited understanding of its structural response, current design codes do not allow the use of high strength materials beyond a certain strength limit. This paper reports additional test data, analytical and numerical studies leading to a new design method to predict the ultimate resistance of composite columns made of high strength steel and high strength concrete. Based on previous study on high strength concrete filled steel tubular members and ongoing work on high strength concrete encased steel columns, this paper provides new findings and presents the feasibility of using high strength steel and high strength concrete for general double symmetric composite columns. A nonlinear finite element model has been developed to capture the composite beam-column behavior. The Eurocode 4 approach of designing composite columns is examined by comparing the test data with results obtained from code's predictions and finite element analysis, from which the validities of the concrete confinement effect and plastic design method are discussed. Eurocode 4 method is found to overestimate the resistance of concrete encased composite columns when ultra-high strength steel is used. Finally, a strain compatibility method is proposed as a modification of existing Eurocode 4 method to give reasonable prediction of the ultimate strength of concrete encased beam-columns with steel strength up to 900 MPa and concrete strength up to 100 MPa.

Keywords

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