Industrial revolution. With the arrival of the new century, steel bridges are riveted together instead of

Where bolts and concrete bridges are thrown, they are not members of prefabricated and large bridges.

From the tie bars and small parts, don't roll together. Plastic is not yet available.

Invented. Construction techniques, such as manufacturing, mud wall protection, soil freezing,

The reinforced earth wall is not pregnant yet. Measuring machinery

There are still 75 years to go before infrared and optical technology.

Bridge construction is the beginning of the new millennium. New building

Technology and new materials are constantly emerging. Bridges are also facing new solutions.

The needs of related research in the construction industry, these new technologies

Materials.

Long-span bridge

suspension bridge

Although the construction of suspension bridge has been going on for 20 years, the speed is not fast.

This century, unprecedented Excellence, is based on records.

Far East and Denmark. The two sides officially opened the Akashi Strait Bridge in Japan, which is a great ribbon bridge.

It was completed in Denmark on 1998. The Akashi Strait Bridge was officially opened to traffic, which is the largest suspension bridge in the world.

In this world, the year when there was a bridge, m, 199 1, is the second largest bridge in China.

Use paragraph 1624).

Although it has increased nearly five times in the cross-century process,

They have reached their physical limits with today's materials. This study will

New requirements for ultra-high strength steel wire and carbon fiber wire must be developed.

Suspension cables are established, which will no longer be the main possibility to increase the span length.

Over 2000 meters.

When we enter the new Millennium, we will restore and continue to maintain the existing ones.

The suspension bridge must continue. The recent detoxification measures are the main ones.

Cable suspension systems and these bridges were found to be degraded.

Hydrogen embrittlement corrosion. What's left of this research?

Life suspension bridge cable and what measures can be taken to slow down or

Stop the process of degradation.

Transport in the new Millennium

Other components of existing and new long-span bridges are undergoing revolutionary changes.

Technological progress. The technology of producing stronger and lighter on deck is put forward.

Deck. Orthogonal cards and ectodermal cards are more and more popular because of their large span.

As a means to reduce the dead load of the structure. Bearing, combined system and seismic capacity

More and more active ingredients are larger-scale testing equipment.

Build.

50 points! ! ~ ~ Thank you