Techno Press

Steel and Composite Structures   Volume 27, Number 2, April25 2018, pages 185-192
Experimental study on creep behavior of fly ash concrete filled steel tube circular arches
Wu T. Yan, Bing Han, Jin Q. Zhang, Hui B. Xie, Li Zhu, and Zhong J. Xue

Abstract     [Full Text]
    Fly ash can significantly improve concrete workability and performance, and recycling fly ash in concrete can contribute to a cleaner environment. Since fly ash influences pozzolanic reactions in concrete, mechanical behaviors of concrete containing fly ash differ from traditional concrete. Creep behaviors of fly ash concrete filled steel tube arch were experimentally investigated for 10% and 30% fly ash replacement. The axes of two arches are designed as circular arc with 2.1 m computed span, 0.24 m arch rise, and their cross-sections are all in circular section. Time dependent deflection and strain of loading and mid-span steel tube were measured, and long term deflection of the model arch with 10% fly ash replacement was significantly larger than with 30% replacement. Considering the steel tube strain, compressive zone height, cross section curvature, and internal force borne by the steel tube, the compressive zone height and structural internal forces increased gradually over time due to concrete creep. Increased fly ash content resulted in more significant neutral axis shift. Mechanisms for internal force effects on neutral axis height were analyzed and verified experimentally.
Key Words
    creep; fly ash; concrete filled steel tubes; arch; experiment
(1) Wu T. Yan, Bing Han, Hui B. Xie, Li Zhu:
School of Civil Engineering, Beijing Jiaotong University, Shangyuancun 3, Haidian District, Beijing 100044, P.R. China;
(2) Bing Han:
vKey Laboratory of Safety and Risk Management on Transport Infrastructures, Ministry of Transport, PRC, Beijing 100044, P.R. China;
(3) Jin Q. Zhang:
Research Institute of Highway Ministry of Transportation, West Tucheng Road 8, Haidian District, Beijing 100088, P.R. China;
(4) Zhong J. Xue:
Beijing Road Engineering Quality Supervision Station, Panjiamiao 222, Fengtai District, Beijing 100076, P.R. China.

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