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Structural Engineering and Mechanics Volume 61, Number 5, March10 2017 , pages 645-655 DOI: https://doi.org/10.12989/sem.2017.61.5.645 |
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Seismic applicability of a long-span railway concrete upper-deck arch bridge with CFST rigid skeleton rib |
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Changjiang Shao, Jiann-wen Woody Ju, Guoqing Han and Yongjiu Qian
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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. | ||
| Key Words | ||
| seismic applicability; long-span railway arch bridge; CFST rigid skeleton; ductile design; seismic isolation; triple friction pendulum system; lead-plug rubber bearing | ||
| Address | ||
| Changjiang Shao, Yongjiu Qian: School of Civil Engineering, Key Laboratory of Ministry of Education of Traffic Tunnel Engineering, Southwest Jiaotong University, Chengdu 610031, China Jiann-wen Woody Ju: Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA; School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China Guoqing Han: China Railway Eryuan Engineering Group Co. Ltd, Chengdu 610031, China | ||