Techno Press

Steel and Composite Structures   Volume 21, Number 1, May20 2016, pages 109-122
Influence of creep on dynamic behavior of concrete filled steel tube arch bridges
Yishuo Ma, Yuanfeng Wang, Li Su and Shengqi Mei

Abstract     [Full Text]
    Concrete creep, while significantly changing the static behaviors of concrete filled steel tube (CFST) structures, do alter the structures' dynamic behaviors as well, which is studied quite limitedly. The attempt to investigate the influence of concrete creep on the dynamic property and response of CFST arch bridges was made in this paper. The mechanism through which creep exerts its influence was analyzed first; then a predicative formula was proposed for the concrete elastic modulus after creep based on available test data; finally a numerical analysis for the effect of creep on the dynamic behaviors of a long-span half-through CFST arch bridge was conducted. It is demonstrated that the presence of concrete creep increases the elastic modulus of concrete, and further magnifies the seismic responses of the displacement and internal force in some sections of the bridge. This influence is related closely to the excitation and the structure, and should be analyzed case-by-case.
Key Words
    creep; seismic analysis; time-dependent analysis; concrete; steel; arch bridges
(1) Yishuo Ma, Yuanfeng Wang, Li Su, Shengqi Mei:
School of Civil Engineering, Beijing Jiaotong University, No. 3 Shangyuancun Road, Haidian District, Beijing, 100044, P.R. China;
(2) Yishuo Ma:
Center of Science and Technology of Construction, Ministry of Housing and Urban-Rural Development (MOHURD), No. 9 Sanlihe Road, Haidian District, Beijing, 100835, P.R. China.

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