STUDY OF SEISMIC ISOLATION SYSTEM OF JAMUNA MULTIPURPOSE BRIDGE, BANGLADESH

Abstract eng:
This paper examines the use of bearings and energy dissipating devices for seismic isolation of Jamuna Multipurpose Bridge over the Jamuna River in Bangladesh. The 4.8km long bridge is located in a seismically active region and over an alluvial flood plain. The designers used lubricated sliding bearings and steel dampers for protection against possible seismic events. The isolation system and the mechanism of operation are described here along-with the layout and the general arrangement. Other integral components of the system and the installation details are also investigated. Summary of the laboratory tests performed on the bearings and the seismic devices are reviewed to verify the properties of the system. Maintenance procedure and rehabilitation strategies for the system after possible seismic damage are explained. Investigation of the design philosophy and mechanism of the seismic devices show that the although the isolation system can be helpful in reducing seismic damage potential of the structure in case of weak or moderate events, it has some serious shortcomings in terms of strong earthquakes or long-term performance basis. Relevant design code provisions are discussed in this regard.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket