Structural characteristics of scissors-type emergency bridges

This paper applies the scissors structure to the emergency bridge for natural disasters such as flood or earthquake. The rapid expanding of the scissors structure is quite suitable for the scissors-type emergency bridge to save the time and life of injured people. While this scissors structure has the boundary condition of cantilever at folding or pre-expanding stage, we have the simply supported condition with restraint against sway direction after reaching to the opposite bank. Since the longitudinal displacement is free in the construction stage, this restraint is necessary for the stability of structures. While the self-weight or dead load is only the external force before expanding, the traffic load and pedestrian weight will be added via the floor panel after reaching to the opposite ground. In general, these scissors structures are made of frames and treated as the statically-indeterminate structures, but single and double panel systems can be solved by the equilibrium condition only. Therefore, it is expected that we must carry out the FEM analysis in order to solve three or more panels. The explanation and generalization about solvability of these equilibrium equations for scissors structures is the one of major purpose of this study. It is presented here that the straightforward matrix formulation by using simple equilibrium equations is sufficient for scissors-type structures.

• Authors:
  • Nakazawa, M
  • Ario, I
• Conference:
  • Australian Small Bridges Conference, 5th, 2012, Surfers Paradise, Queensland, Australia
• Publication Date: 2012-11

Language

• English

Media Info

• Pagination: 7p
• Monograph Title: A comparison of bore sounding, global stiffness and through compression wave non-destructive testing of Australian hardwood timber bridges

Subject/Index Terms

• TRT Terms: Bridge design; Bridges; Cantilevers; Disasters; Emergencies; Finite element method; Structural analysis
• Uncontrolled Terms: Temporary
• Geographic Terms: Japan
• ATRI Terms: Bridge design; Cantilever; Disaster management; Emergency; Finite element method; Structural analysis; Temporary bridge
• ITRD Terms: 9011: Design (overall design); 2184: Emergency
• Subject Areas: Bridges and other structures; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01472862
• Record Type: Publication
• Source Agency: ARRB
• Files: ITRD, ATRI
• Created Date: Feb 19 2013 10:15AM