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American standard H-beam, British standard H-beam, European standard H-beam, and external standard H-beam
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Steel structures are divided into building steel structures, bridge steel structures, etc. Compared with the commonly used reinforced concrete structures in the current construction field, they have advantages such as high strength, low engineering cost, light weight, short construction period of H-shaped steel according to the Zhou De standard, and can be manufactured in factories. These advantages have been widely recognized and rapidly developed, from the use of steel structures in major projects and iconic buildings to the widespread use of steel structures, presenting an unprecedented prosperity.
Major cities regard the construction of transportation infrastructure such as bridges as an important foundation for economic development. There are cable-stayed bridges that use more steel structures, mainly in steel boxes, cables, bridge towers, and other parts. Extra large bridges over 600 meters are all steel structure bridges? In the first three years of the 11th Five Year Plan, an average of 30000 new bridges were built per year, with an average annual steel consumption of 13 million tons. According to statistics, currently 3480 steel structure bridges can be implemented in the construction of concrete bridges on expressways. After switching to steel structure, a net increase of 5.46 million tons of steel consumption can be achieved. As of the end of 2008, there were less than 1 steel structure bridge among the 590000 bridges in China.
Compared with the steel structure bridges accounting for 33 out of the 600000 bridges in the United States and 41 out of the 130000 bridges in Japan, there is a significant gap. A bridge with an all steel structure tower in China is the Nanjing Third Bridge, with a steel consumption of 14400 tons for the tower alone? The Stonecutters Island Bridge in Hong Kong (1018 meters in length) and the Sutong Yangtze River Bridge (1088 meters in length) rank among the top two major cable-stayed bridges in the world. By 2015, China will build five cross strait bridges with a total steel consumption of 6.25 million tons.
In recent years, spatial structures represented by grid structures and latticed shells have continued to develop in large numbers, not only for civil buildings, but also for industrial factories, hangars, terminal buildings, sports venues, exhibitions, theaters, museums, and more.
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