What Is Good About A Beam Bridge?

What is the strongest type of bridge?

Truss bridgesTruss bridges are extremely effective because they have a high strength to weight ratio.

In this experiment we have tested which type of truss bridge is the strongest, yet uses the least amount of material.

Two of the most used truss bridges are of the Pratt and Howe design..

How much weight can a beam bridge support?

Beam bridge number two held 12 pounds so the average weight of the beam bridges was 13.25 pounds. Arch bridge number one held 21.5 pounds. The second arch bridge held 21 pounds so the average weight held by the arch bridges was 21.25 pounds. Truss bridge number one held 24 pounds.

How do you strengthen a beam bridge?

To create very tall beams, bridge designers add supporting latticework, or a truss, to the bridge’s beam. This support truss adds rigidity to the existing beam, greatly increasing its ability to dissipate the compression and tension. Once the beam begins to compress, the force spreads through the truss.

What is the longest bridge in the world?

Danyang–Kunshan Grand BridgeThe Lake Pontchartrain Causeway is the world’s longest continuous bridge over water. The world’s longest bridge is the Danyang–Kunshan Grand Bridge in China, part of the Beijing-Shanghai High-Speed Railway.

Why is an arch stronger than a beam?

Strength. An arch bridge is stronger than a beam bridge, simply because the beam has a weak point in the center where there is no vertical support while arches press the weight outward toward the support. … Arch bridges, meanwhile, have been used to cover very long distances, with up to 800 feet for a single arch.

What are the strengths of a truss bridge?

The Pros of Truss BridgesHigh Strength. The triangular shape that the supports are place in give it a great amount of strength. … No Span Restrictions. … Road Placement. … Relatively Economical. … Large Amount of Maintenance Required. … Difficult Design To Execute. … Heavy Weight. … Low Weight Capacities.More items…•

What material is strongest in tension for bridges?

SteelSteel is a useful bridge material because of its high strength in both compression and tension. Steel is also a ductile material, meaning that it can be bent or shaped easily into different forms.

What are the advantages of suspension bridges?

Pros of a Suspension BridgeIt can span over long distances. Suspension bridges can span anywhere between 2,000 to 13,000 feet, which is farther than any type of bridge can accommodate. … It is inexpensive to build. … It is easy to maintain. … It is incredibly versatile. … It is aesthetically pleasing.

How long does it take to build a beam bridge?

It took eight years, five major contractors and the relentless labour of 432 construction workers each day to build Tower Bridge in 1886. Two massive piers were sunk into the river bed to support the construction and over 11,000 tons of steel provided the framework for the Towers and Walkways.

How long are bridges designed to last?

about 70 yearsThe average life span of highway bridges is about 70 years and the majority of bridges currently in use were built after 1945. However, significant environmental damage requiring repair typically occurs before the average bridge reaches mid-life.

What is the advantage of a beam bridge?

Pros: A beam bridge is easy to build, it is not that expensive compared to other bridges, and beam bridges are also easily used in rural and urban communities. Cons: Beam bridges have a limited span on the top, they are not made very eye-catching, and large ships can’t go underneath it.

What are the strengths and weaknesses of a Arch Bridge?

List of Weaknesses of an Arch BridgeIt has a limited span. … It has constraints on location. … It requires extra maintenance. … It requires more support. … It can take long to build. … It is costly to build.

What was the first beam bridge?

The first reinforced concrete girder (beam) bridge was built in 1903 but the design was apparently never widely used for small structures. The State Roads Commission’s Standard Plans of 1912 and 1919 specified the use of the girder for the largest of small structures, the 18-foot span.

What are the disadvantages of an arch bridge?

List of the Disadvantages of Arch BridgesIt offers a finite span length to use. … It is a time-consuming project to complete. … It is a structure which requires careful maintenance. … It is a bridge option that cannot be built in some locations. … It requires more side support to complete a successful span.More items…•

What are bridge supports called?

Pile: A pile is a vertical support structure that’s used, in part, to hold up a bridge. It can be made of wood, concrete, or steel. A pile is hammered into the soil beneath the bridge until the end of it reaches the hard sub layer of compacted soil or rock below.

What is one disadvantage to beam girder bridges?

Followings are the disadvantages of the beam bridges: Beam Bridge contains forces, which are much larger than the load, and it needs to be relatively massive. Beam Bridges have a limited span and do not allow large boats or vehicles to pass underneath. Mostly heavy boat traffic or large ships cannot pass underneath.

What are the pros and cons of an arch bridge?

List of Cons of Arch BridgesTheir construction is a tough job. … Their spans are limited. … There can be constraints on their locations. … More supports are usually required. … They require extra maintenance. … It can take a long time to build one. … Their construction requires high costs.

What makes a beam bridge so strong?

The weight of the beam pushes straight down on the piers. The beam itself must be strong so that it doesn’t bend under its own weight and the added weight of crossing traffic. When a load pushes down on the beam, the beam’s top edge is pushed together (compression) while the bottom edge is stretched (tension).