走进修建(国外英文资料).docVIP

走进建筑(国外英文资料) The skyscraper is also known as the super-tall building, which is very tall. Originally it was a 20-story building, but now it usually refers to more than forty or fifty storeys. With the development of high-rise buildings in different places, the definition height of skyscrapers is slightly different. In mainland China, the building codes are more than 100 meters high. Japan, France, and more than 60 meters of righteousness belong to supertall buildings. In the United States, it is widely believed that 152 meters (500 feet) above buildings are skyscrapers. When the tower was built in the 11th century, there were only four floors, which was a rare tall building at the time. The walls of the tower are masonry, each bearing the weight of its upper layers. To make the tower stand up, the bottom wall had to be 5.2 meters thick. Use the building of the heavy wall up to about 5 stories. Because the bottom wall doesnt support a higher structure, no matter how thick it is. It is possible to build tall buildings only by using the frame to support the upper weight and the lighter wall against the wind and snow. The medieval wooden frame house was the first step in that direction. In the 19th century there was a fundamental solution to a huge increase in steel production and reliable performance. The first monolithic iron framework was built in the four storeys built in the British in 1860. It is 16 meters high, with cast iron columns and 9m-long wrought iron beams, which are tightly fixed with bolts. But the skyscraper is produced in the United States. The first skyscraper with a bearing frame was 1884 -- the 10-storey insurance company building built in Chicago in 1885, and the designer was Jenny. The next six layers of iron pillars are a frame of wrought iron, and the four layers are steel frames. Since then, steel frame skyscrapers have been built in the United States. As long as the frame is installed, the entire wall of the skyscraper can be built at the sa