Lateral seismic isolation system for yonging yellow river bridge
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The document summarizes the lateral seismic isolation system used for the Yonging Yellow River Bridge in China. The new lateral isolation system (NLIS) includes elastic cable pairs, fluid viscous dampers at the towers, and buckling resistant bracings at the piers. This is compared to traditional systems and other isolation systems used elsewhere. The NLIS was installed and its dominant mode shape shows it performs better than a traditional fixed system. An alternative steel damper isolation system was also considered but the NLIS was determined to be most suitable for the bridge's seismic conditions and girder weight.
Lateral seismic isolation system for yonging yellow river bridge
- 1. Lateral Seismic Isolation System for Yonging Yellow River Bridge, China By Tofail Ahmed
- 2. The Bridge
- 4. Components of New Lateral Isolation System (NLIS) Elastic Cable Pairs Fluid Viscous Dampers (FVD) at towers Buckling Resistant Bracings (BRB) at piers
- 5. Traditional and Other systems Traditional system with permanent wind resistant bearing, shear key, steel sliding bearings Parallel viscous damper and fuse restraints in Rion-Antirion bridge, Greece Roll N Cage (RNC) isolator tasted in Bill Emerson Bridge, Missouri, USA
- 7. Installation
- 8. Dominant Mode Shape; comparison with traditional system
- 9. Alternative Solution: System Isolated with Steel Dampers (SISD) Energy Dissipation Bearing (EDB) Successfully used in Nanjing Jia river Bridge Available product specification: deformation capacity 150mm, yield strength less than 1500kN Girder weight: 112 ton/m (Yellow river bridge) 60.2 ton/m (Nanjing Jia river bridge) Spectral acceleration: .44g (Yellow river bridge) .30g (Nanjng Jia river bridge)
- 11. Comparison between SISD and NILS
- 13. Design Team Zhongguo Guan Associate Professor, State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji Univ., Shanghai 200092, China Han You Department of Bridge Engineering, Tongji Univ., Shanghai 200092, China Jian-zhong Li Professor, Stae Key Laboratory for Disaster Reduction in Civil Engineering, Tongji Univ., Shanghai 200092, China
- 14. Disclaimer: Based on the Paper lateral isolation system of a long span cable stayed bridge with heavyweight concrete girder in a high seismic region, by Zhongguo Guan; Han You; and Jian-zhong Li, Journal of Bridge Engineering, Volume 22 Issue 1 January 2017