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Cantilever DrawBridge
3
Transcript
By Jesse Resurreccion, Christian Blanquera, Josiah Strigler, and Daniel Sanchez
Cantilever Drawbridge
Disadvantages
- Complex to build and maintain, with constant complications during construction times.
- Costs highly due to the need for a substantial structure for stability by balancing compressive and tensile forces.
- require bigger and more durable support columns.
- neither resistant to earthquake areas nor low-rock stability places.
- experience high amounts of turning stress during construction.
Assets of Cantilever Bridges
- has the main element of a cantilever, which is a structure piece anchored into a base, while the bridge remains suspended.
- provided passageway for automobiles, ships, and pedestrians by compact beams and steel tracts.
- larger cantilever bridges are constructed with concrete for functioning railroad or roadway traffic.
Advantages
- support is only required in one side of the Cantilever support.
- Supports are single sided and simple columns.
- Do not require any type of falsework, which are temporary during construction, with exception to construction of piers.
- highly ideal for gorges in caverns, and other deep structures, such as bodies of water.
- have no obstruction for traffic during construction
History
Famous Cantilever Bridges
- 1st Cantilever bridge was created during the 19th century, when a need for a longer bridge appeared.
- While solving the necessity for length, the bridge was designed with supports to proportionally distribute the loads.
- Precursor designs to the Cantilever bridge included hinge designs in the midway of the bridge.
- Heinrich Gerber first patented the Cantilever bridge in 1866.
How Cantilever Bridges Work
- Quebec Bridge in Quebec Canada- roadway/pedestrian bridge towards the Saint Lawrence River
- Forth Bridge- railway bridge over the 5th and 4th in Scotland/longest span of 520 m.
- Minato Bridge- Osaka Japan/built in 1973 with span of 510 m.
- Oakland Bay Bridge- span of 427 m./built in 1936
- Cantilever Bridges are supported by one end, while the structure is extended horizontally.
- Sizable Cantilever Bridges are designed with steel trusses to support roadways or railways.
Forces
- main forces of compression and tension are present.
- compression and tension forces are directed forwards by a suspension deck.
- cantilever arms support load weight in a compressing force.
- top support of the bridge experience tension.
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