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Because of cracks and corrosion. Actually, poor maintenance is the cause of ALL modern bridge failures and closures.
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∙ 16y ago
Wiki User
∙ 11y agobecause they very good to use.
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Why are bridges declared unsafe after long use?
Due to repeated stress and strain, the material used in the bridges loses elastic strength and ultimately may be collapsed. Hence, bridges are declared unsafe after long use
Why do steel bridges take so long to build?
Steel bridges take a long time to build because of the precision of the work. The pieces have to fit perfectly together, or else the bridge will not be safe.
Why are suspension bridges used for long spans?
The longest bridges in the world are viaducts or trestle bridges. It is easier to design a high, elevated roadway by directly supporting it with many towers or piers (as in a viaduct or trestle bridges). It is more difficult to design an elevated roadway with a large unobstructed span (as in a suspension bridge or arch bridge). However, the bridges with the longest unobstructed spans in the world are invariably suspension bridges, because ...
What materials go into building a bridge?
Bridges are very complex structures that must be carefully engineered using long-lasting and strong materials. Some of the materials that are used for bridge building includes stones, cement, steel, wood, and composites.
What is a beam bridge made out of?
Most highway beam bridges are made of concrete and steel. Beam Bridges are in the form of plate grinders, box grinders or trusses.
What features of an Arch bridge is strong?
Bridges typically have three characteristics and are built into three different types. These include truss bridges, beam bridges, and suspension bridges.
Why is long loose hair unsafe in a lab?
I think long,loose hair is unsafe in a lab because you could burn your hair.
How long are beam bridges?
as long as 552 m
How many miles between bay bridges?
The Bayonne Bridge is 1.095 miles long. It is the fifth longest steel arch bridge in the world. It opened on November 15, 1931.
Why is long hair unsafe?
it could get caught in an escalator
How long are truss bridges?
the longest span of a truss bridge is 2.1 miles long
What is the difference between steel and steel long?
one is long you dumb person
