古代的建筑英文介绍 建筑的发展.ppt

In the next 1400 years, the bridge survived at least ten major floods and earthquakes, the nearest of which being the 7 degree Xingtai Earthquake in 1966. the bridge is still in use. * In China, the dragon is a lucky, and He can control the river on the bridge has a lot of dragon, this is the biggest dragons head, * Zhaozhou bridge has a beautiful story the bridge was built in a single night. by a master architect named Lu Ban And the bridge was put to the test by two old man who crossed it， One riding a donkey, another, pushing a carriage with three mountain and five moon. at the same time Lu Ban supporting the structure under the bridge. * When Professor Liang Sicheng of Tsing Hua University rediscovered the bridge in Hebei province, published a report and drawing, it became world famous. * Zhaozhou Bridge was dedicated as an International Historic Civil Engineering Landmark by the American Society of Civil Engineers in 1991. a very important place in the world bridge building history. * Steel and cement, are the two most important construction materials of modern times,they were introduced in the nineteenth century. The enormous advantage of steel is its tensile strength; that is, it does not lose its strength when it is under a calculated degree of tension, a force which, （as we have seen）, tends to pull apart many materials. Modern cement, called Portland cement, was invented in 1824. It is a mixture of limestone and clay, which is heated and then ground into a powder. And whereas steel has great tensile strength, concrete has great strength under compression. Thus, the two substances complement each other. * Steel and cement, are the two most important construction materials of modern times,they were introduced in the nineteenth century. The enormous advantage of steel is its tensile strength; that is, it does not lose its strength when it is under a calculated degree of tension, a force which, （as we have seen）, tends to pull apart many mate