Structural Engineering and Mechanics

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Seismic applicability of a long-span railway concrete upper-deck arch bridge with CFST rigid skeleton rib

  • Shao, Changjiang (School of Civil Engineering, Key Laboratory of Ministry of Education of Traffic Tunnel Engineering, Southwest Jiaotong University) ;
  • Ju, Jiann-wen Woody (Department of Civil and Environmental Engineering, University of California) ;
  • Han, Guoqing (China Railway Eryuan Engineering Group Co. Ltd.) ;
  • Qian, Yongjiu (School of Civil Engineering, Key Laboratory of Ministry of Education of Traffic Tunnel Engineering, Southwest Jiaotong University)
  • Received : 2015.12.12
  • Accepted : 2016.12.06
  • Published : 2017.03.10
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Abstract

To determine the seismic applicability of a long-span railway concrete upper-deck arch bridge with concrete-filled steel-tube (CFST) rigid skeleton ribs, some fundamental principles and seismic approaches for long-span bridges are investigated to update the design methods in the current Code for Seismic Design of Railway Engineering of China. Ductile and mixed isolation design are investigated respectively to compare the structural seismic performances. The flexural moment and plastic rotation demands and capacities are quantified to assess the seismic status of the ductile components. A kind of triple friction pendulum (TFP) system and lead-plug rubber bearing are applied simultaneously to regularize the structural seismic demands. The numerical analysis shows that the current ductile layout with continuous rigid frame approaching spans should be strengthened to satisfy the demands of rare earthquakes. However, the mixed isolation design embodies excellent seismic performances for the continuous girder approaching span of this railway arch bridge.

Keywords

Acknowledgement

Supported by : National Natural Science Fund Committee of China

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