[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.12989/sem.2019.70.1.013

Numerical simulation and analytical assessment of STCC columns filled with UHPC and UHPFRC

Nguyen, Chau V. (Institute of Research and Development, Duy Tan University)
Le, An H. (Division of Construction Computation, Institute for Computational Science, Ton Duc Thang University)
Thai, Duc-Kien (Department of Civil and Environmental Engineering, Sejong University)

Publication Information

Structural Engineering and Mechanics / v.70, no.1, 2019 , pp. 13-31 More about this Journal

Abstract

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 "CC3DNonlinCementitious2User" of UHPC without and with the incorporation of steel fibers (UHPFRC) in compression and tension were adopted in FEM. The predictions of utimate strength and axial load versus axial strain curves obtained from FEM were in a good agreement with the test results of eighteen tested columns. Based on the results of FEM, the load distribution on the steel tube and the concrete core was derived for each modeled column. Furthermore, the effect of bonding between the steel tube and the concrete core was clarified by the change of friction coefficient in 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.

Keywords

UHPC; UHPFRC; steel tube; concrete core; FEM; ATENA-3D; confined concrete;

Citations & Related Records

Times Cited By KSCI : 6 (Citation Analysis)

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