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Steel and Composite Structures
  Volume 19, Number 1, July 2015 , pages 111-129

Creep performance of concrete-filled steel tubular (CFST) columns and applications to a CFST arch bridge
Meng-Gang Yang, C.S. Cai and Yong Chen

    This paper first presents an experimental study of twelve specimens for their creep performance, including nine concrete-filled steel tubular (CFST) columns and three plain concrete columns, subjected to three levels of sustained axial loads for 1710 days. Then, the creep strain curves are predicted from the existing creep models including the ACI 209 model, the MC 78 model, and the MC 90 model, and further a fitted creep model is obtained by experimental data. Finally, the creep effects of a CFST arch bridge are analyzed to compare the accuracy of the existing creep models. The experimental results show that the creep strains in CFST specimens are far less than in the plain concrete specimens and still increase after two years. The ACI 209 model outperforms the MC 78 model and the MC 90 model when predicting the creep behavior of the CFST specimens. Analysis results indicate that the creep effects in the CFST arch bridge are significant. The deflections and stresses calculated by the ACI 209 model are the closest to the fitted model in the three existing models, demonstrating that the ACI 209 model can be used for creep analysis of CFST arch bridges and can meet the engineering accuracy requirement when lack of experimental data.
Key Words
    Concrete-filled steel tubular (CFST); creep experiment; creep performance; creep effect; CFST arch bridge
(1) Meng-Gang Yang:
School of Civil Engineering, Central South University, Changsha 410075, P.R. China;
(2) C.S. Cai:
Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA;
(3) Yong Chen:
Shanghai Municipal Engineering Design Institute (Group) Co. Ltd., Shanghai 200092, P.R. China.

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