Issue 47

Y. Mizuno et alii, Frattura ed Integrità Strutturale, 47 (2019) 209-220; DOI: 10.3221/IGF-ESIS.47.16

Construction Method / Names of Completed Bridge

Efficiency （ Dimensionless ）

Construction Process

Transition

Material

Time

○ △

Lowering Method

Overhanging Arch Erection Method with Truss

○

×

Arch Center Method

○

×

Balanced Cantilever Method

◎ △

Launching Erection Method

△ ◎

Span by Span Construction Method

◎

×

Single ‐ Operation Method with Floating Crane or Pontoon

◎

×

Fixed Timbering Erection Method

◎

×

Table 5 : Structural change list No. 2 for newly constructed bridges.

Triangular Coordinate System

Constructed Completed Retrofitted Retrofitting

More efficient because of the material efficiency Efficient because of the material efficiency More efficient because of the material efficiency

Efficient because of the material efficiency Efficient if being used as a diagonal system

Efficient because of the material efficiency Efficient at both time and material because of being

Suspension System (Spanning System)

Low efficiency

Diagonal System (Beam System)

Web System (Beam System)

Efficient

used as a cantilever

Efficient for Supporting exisiting spanning systems

Arch System (Spanning System)

Low efficiency

Efficient

Table 6 : Effectiveness in each structure system.

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