Steel and Composite Structures

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Experimental behavior of VHSC encased composite stub column under compression and end moment

  • Huang, Zhenyu (Guangdong Provincial Key Laboratory of Durability of Marine Civil Engineering, Shenzhen University) ;
  • Huang, Xinxiong (Guangdong Provincial Key Laboratory of Durability of Marine Civil Engineering, Shenzhen University) ;
  • Li, Weiwen (Guangdong Provincial Key Laboratory of Durability of Marine Civil Engineering, Shenzhen University) ;
  • Mei, Liu (Guangdong Provincial Key Laboratory of Durability of Marine Civil Engineering, Shenzhen University) ;
  • Liew, J.Y. Richard (Department of Civil and Environmental Engineering, National University of Singapore)
  • Received : 2018.12.09
  • Accepted : 2019.03.19
  • Published : 2019.04.10
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Abstract

This paper investigates the structural behavior of very high strength concrete encased steel composite columns via combined experimental and analytical study. The experimental programme examines stub composite columns under pure compression and eccentric compression. The experimental results show that the high strength encased concrete composite column exhibits brittle post peak behavior and low ductility but has acceptable compressive resistance. The high strength concrete encased composite column subjected to early spalling and initial flexural cracking due to its brittle nature that may degrade the stiffness and ultimate resistance. The analytical study compares the current code methods (ACI 318, Eurocode 4, AISC 360 and Chinese JGJ 138) in predicting the compressive resistance of the high strength concrete encased composite columns to verify the accuracy. The plastic design resistance may not be fully achieved. A database including the concrete encased composite column under concentered and eccentric compression is established to verify the predictions using the proposed elastic, elastoplastic and plastic methods. Image-oriented intelligent recognition tool-based fiber element method is programmed to predict the load resistances. It is found that the plastic method can give an accurate prediction of the load resistance for the encased composite column using normal strength concrete (20-60 MPa) while the elastoplastic method provides reasonably conservative predictions for the encased composite column using high strength concrete (60-120 MPa).

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China(NSFC), Shenzhen University

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