Risk Management for Seismic Retrofit of a Long-Span Truss Bridge Applying Damage-Controlled Design

The Minato Bridge is a long-span truss bridge with a length of 980m and located in the Hanshin Expressway at the Osaka Port, Japan. Although damage to this bridge from the 1995 Hyogo-ken Nanbu Earthquake had not been so serious, design seismic force for highway bridges was revised after the earthquake. Seismic performance of the bridge was evaluated by dynamic analysis applying revised ground motions and its seismic risk was found to be at non-negligible level. In this project, several types of retrofit structural systems with three different performance levels were considered and evaluated using seismic life-cycle cost (S-LCC). S-LCC consists of retrofitting cost and seismic risk. Several risks were calculated using the damage probability obtained from the hazard and fragility curves as well as cost data. As a result, the damage-controlled structure with minimized S-LCC was employed to achieve rational retrofit from a view point of risk management. The concept was to differentiate main members which support vertical load from sub-members for lateral force such as seismic force. In this design, main members were required to be within linear region and sub-members were allowed to perform nonlinearly to provide damping. This structural system should allow early reopening of the bridge to traffic even after a severe earthquake so that it will serve as a part of lifeline and reduce social loss.

• Corporate Authors:

  World Road Association (PIARC)

  La Grande Arche, Paroi Nord, Niveau 5
  F-92055 La Defense Cedex,   France 
• Authors:
  • Kanaji, Hidesada
  • Fujino, Yozo
  • Ishibashi, T
  • Tokumasu, T
• Conference:
  • Choice for Sustainable Development. Pre-Proceedings of the 23rd PIARRC World Road Congress
  • Location: Paris , France
  • Date: 2007-9-17 to 2007-9-21
• Publication Date: 2007

Language

• English

Media Info

• Media Type: CD-ROM
• Features: Figures; References; Tables;
• Pagination: 12p
• Monograph Title: The Choice for Sustainable Development. Pre-Proceedings of the 23rd PIARC World Road Congress

Subject/Index Terms

• TRT Terms: Earthquake resistant design; Earthquake resistant structures; Life cycle analysis; Life cycle costing; Long span bridges; Retrofitting; Risk assessment; Risk management; Truss bridges
• Subject Areas: Bridges and other structures; Design; Finance; Highways; Safety and Human Factors; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01080990
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 26 2007 9:54AM