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Structural Engineering and Mechanics   Volume 70, Number 1, April10 2019, pages 013-31
Numerical simulation and analytical assessment of STCC columns filled with UHPC and UHPFRC
Chau V. Nguyen, An H. Le and Duc-Kien Thai

Abstract     [Buy Article]
    A nonlinear finite element model (FEM) using ATENA-3D software to simulate the axially compressive behavior of circular steel tube confined concrete (CSTCC) columns infilled with ultra high performance concrete (UHPC) was presented in this paper. Some modifications to the material type \"CC3DInterface\" in FEM. The numerical results revealed that the increase in the friction coefficient leads to a greater contribution from the steel tube, a decrease in the ultimate load and an increase in the magnitude of the loss of load capacity. By comparing the results of FEM with experimental results, the appropriate friction coefficient between the steel tube and the concrete core was defined as 0.3 to 0.6. In addition to the numerical evaluation, eighteen analytical models for confined concrete in the literature were used to predict the peak confined strength to assess their suitability. To cope with CSTCC stub and intermediate columns, the equations for estimating the lateral confining stress and the equations for considering the slenderness in the selected models were proposed. It was found that all selected models except for EC2 (2004) gave a very good prediction. Among them, the model of Bing et al. (2001) was the best predictor.
Key Words
    UHPC; UHPFRC; steel tube; concrete core; FEM; ATENA-3D; confined concrete
Chau V. Nguyen: Institute of Research and Development, Duy Tan University, 03 Quang Trung, Danang, Vietnam
An H. Le:
1) Division of Construction Computation, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
2) Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
Duc-Kien Thai: Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul, 143-747, South Korea

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