Architectonics 1

Six main types:

Arch bridge - Beam bridge - Cable stayed bridge - Cantilever bridge - Suspension bridge - Truss bridge

ARCH BRIDGES main characteristics:

1. High strength

2. Has supports at each end

3. Materials can bare the weight under compression

4. Span from 60 to 240m

5. Deck is either supported or hung from the main structure

1. Deck Arch Bridge:

- deck on top of arch

- supported by spanderals

- spandrels: number of vertical columns or solid wall spandrels

- Another name: cathedral arch bridge

2. Through Arch Bridge

- Deck below arch and supported by vertical hangers

- Arch supported at each end

3. Half-through Arch Bridge

- Ends of arch rib connected by ties

- Deck is primary support

A) arch rib:

main structure

carries the load

materials: reinforced concrete or steel

most aesthetic component of the bridge

new materials used: oncrete-filled steel   tubular, high-performance concrete, steel  concrete composites

B) Abutments/Supports/ Piers

  carries most of the load transmitted from arch ribs

materials: reinforced concrete or steel

new materials used: cellular reinforced concrete and mass concrete (cheaper)

C) Hangers and Spandrels