我国桥梁工程培植用钢长大状态(国外英文资料).doc

我国桥梁工程建设用钢发展状况(国外英文资料) Railway bridge steel such as jiujiang Yangtze river bridge, the mouth of the Yellow River bridge, sun long east of the Yellow River bridge, wuhu Yangtze river bridge, such as male iron amphibious bolt welded steel bridge or railway bolt welded steel bridge; And by riveting of girder node receives welding integral node, tied to plug welding proportion by early little welding much tied to the all welding integral node, to 14 MNNBQ steel by 16 MNQ development, from 24 mm to 56 mm steel plate thickness. At present, the material mainly for 14 MNNBQ steel design of railway Bridges, with the acceleration of Chinas railway, a large number of high-speed railway bridge will be built, puts forward new requirements for bridge steel: (1) strength level transition from 370 MPa to 420 MPa (the beijing-shanghai high-speed railway under construction of component has used the nanjing pass bridge steel grade). The demand for steel plate weathering is getting higher and higher. In order to reduce the weld and the nodes, the demand for high-strength bridge plates with ultra-wide overthickness is increasing In the future development of steel Bridges, comply with the needs of bridge engineering development of high strength, lightweight, weldability, fault resistance, fatigue resistance, long service life, good weather resistance of high performance In the future development of steel Bridges, comply with the needs of bridge engineering development of high strength, lightweight, weldability, fault resistance, fatigue resistance, long service life, good weather resistance of high performance steel bridge will be the main development direction of steel bridge. According to Chinas 11th five-year development planning, traffic engineering of the bridge will be increased, the railway bridge adopts steel structure, in recent years has become the development trend of highway bridge using steel structure, steel weight of the future will also have a larger increase. In the nea