Presentation based on a review of a paper as a class project

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

12. Sensitivity Analysis

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

15. Thank You!!
Questions?