Structural Engineering and Mechanics

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Creep effects on dynamic behavior of concrete filled steel tube arch bridge

  • Ma, Y.S. (School of Civil Engineering, Beijing Jiaotong University) ;
  • Wang, Y.F. (School of Civil Engineering, Beijing Jiaotong University) ;
  • Mao, Z.K. (School of Civil Engineering, Beijing Jiaotong University)
  • Received : 2010.05.18
  • Accepted : 2010.10.13
  • Published : 2011.02.10
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Abstract

Long-term properties of concrete affect structures in many respects, not excepting dynamic behaviors. This paper investigates the influence of concrete creep on the dynamic behaviors of concrete filled steel tube (CFT) arch bridges, by means of combining the analytical method for the creep of axially compressed CFT members, which is based on Model B3 for concrete creep, with the finite element model of CFT arch bridges. By this approach, the changes of the stress and strain of each element in the bridge with time can be obtained and then transformed into damping and stiffness matrices in the dynamic equation involved in the finite element model at different times. A numerical example of a long-span half-through CFT arch bridge shows that creep influences the natural vibration characteristics and seismic responses of the bridge considerably, especially in the early age. In addition, parameter analysis demonstrates that concrete composition, compressive strength and steel ratio have an obvious effect on the seismic response of the CFT arch bridge.

Keywords

Acknowledgement

Supported by : National Science Foundation of China

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