外文资料（英文）Steel system because of their own with the light weight, high strength, the construction of such advantages, and the reinforced concrete structure, the more "high, light," the development of three unique advantages. Along with the country's economic construction, the long concrete and masonry structure dominate the market situation is changing. Steel products in the large-span space structure, lightweight steel gantry structure, multi-storey and high-rise residential areas of increasing construction, Application areas are expanding. From the West-East Gas sent, the West-East power transmission and-north water diversion project, the Qinghai-Tibet Railway, the 2008 Olympic venues and facilities, residential steel, development of the western region construction practice, the development of a steel construction industry and the market momentum is emerging in our country.1： the steel market development trend of the past 20 years of reform and opening up and economic development, Steel has to create a system of highly favorable environment for development.（1） from the development of the main steel material foundation : Steel is the development of steel a key factor in development. To meet the needs of the construction market, steel varieties will toward complete standardization of materials direction. Domestic steel for construction steel, in terms of quantity, variety and quality have developed rapidly and hot-rolled H-beam, a color plate, Cold steel production increased significantly, the development of steel to create important conditions. Other steel-Steel, Coated Steel Plate and there has been a marked growth, product quality has been greatly improved. Refractory, weathering steel, hot-rolled thin number of H-beam steel has started a new project in the application, Steel to create the conditions for development.（2） from design, production, construction, professional level look : steel industry after years of development, Steel professional design quality in the practice of continually improving. A number of characteristics with the strength of professional institutes, research and design institutes continuously developed steel design software and new technologies. Currently, many domestic steel design software have been brought forth, they can adapt to light steel structure, the network structure, high-rise steel structures, Thin arched structure design needs. With computer technology in the engineering design of the universal application of steel structure design of the software is getting more sophisticated, To help designers complete structural analysis and design, construction mapping provides a great convenience. Steel manufacturers in the country blossom everywhere, and creating a number of strong leading enterprises. Annual output reaching 10 -- 20 million tons of size alone, more than 10 enterprises that the large domestic steel project mission, They fully equipped with the industry and international enterprises to compete on equal strength. At present, some foreign investment, joint ventures, private sector steel manufacturing enterprises in the fierce market competition winners. From the computer design, mapping, digital control, automated processing and manufacturing industries are in the lead, its products range from the traditional building structures, machinery and equipment, non-standard components, and turnkey facilitiesto the value of housing, Container products, port facilities directly to the end-user products. Steel industrialized mass production, the installation of a new steel structure engineering endless, and energy-efficient, waterproof, insulating, , and other advanced product set and integrated suite of applications, design and construction of integrated production will be raised the level of the construction industry.（3） the steel works from the view of the performance : the world's third 421-meter high Shanghai Jinmao Tower, is a leading international standard. height of 279 meters in Shenzhen SEG buildings, the span of 1,490 meters Runyang Yangtze River Bridge, span of 550 meters of the Lupu Bridge, the 345-meter-high transmission tower across the Yangtze River, and the Capital International Airport, nest national sports center, many of steel construction system of the important projects, Steel Buildings positive marks top heavy and large-span steel structure of space development.（4） from the domestic steel industry view : China has steel in housing construction light on the application of the industry as a revolution. With domestic industry to become China's new economic development and growth, lightweight steel residential housing industry will be the development of the country. And the housing industry is the prerequisite for dealing with the industrialization of matching new technologies, new materials and new systems. As the steel structure system easy to realize industrialization and standardization of production, and to go along with the wall material can be used in energy conservation, environmental protection of new materials. Therefore, the study of steel structures for residential package technology will greatly promote domestic industry's rapid development.（5） from the government sector can guide and support : government departments guidance and support, so that as a green steel products and development workers. Steel with the traditional concrete structure, compared with light weight, high strength, good seismic performance advantages. Suitable for live load accounted for a smaller proportion of the total load of the structure, and is more suitable for large-span space structure, tall structures and is suitable for the construction of the soft ground. Is also in line with environmental protection and conservation, intensive use of resources policy, The overall economic benefits to investors increasingly are recognized objective will be to promote the designers and developers they chose steel.2： the steel market outlook of the development trend of steel, China Steel Development has tremendous market potential and prospects for development.（1） since China began in 1996 steel output of over 100 million tons, ranking first in the world. 1998 commissioning of a series of rolling H-beam steel to create a sound material basis. Steel and other materials industries, the development of the steel industry to provide good quality, complete specifications for the material. According to the market demand, the next batch of 23 will be color plate production line, hot-rolled H-beam will also be an increase in production lines, large cold-formed unit will soon be launched. By that time China will produce more than 100 color plates million tons, Hot H-beam more than 100 million tons of cold and the large and medium-sized rectangular pipe and tube, in addition to the existing H-beamwelding, plate, Sheet steel and other construction, the steel industry can meet development needs. With steel production and quality continues to rise, their prices are gradually declining. Steel has been a corresponding cost of a more substantial reduction. And the steel structure supporting the use of thermal insulation, corrosion-resistant materials, fire resistant paint, various welding material and bolts, connectivity products and the technology of new materials will also continue to enhance innovation.（2） efficient and new welding technology of welding and cutting equipment and welding application development and application of materials, for the development of steel works to create a good technical condition. In ordinary steel, thin light steel structures, steel structures in tall buildings, the door frame of light steel structure, network structure, pressure plate structure, welding and the connecting bolt, steel concrete composite floor. CFST steel reinforced concrete structure and the structure of the design, construction, Statutes regulating acceptance of industry standards and has more than 20 of this issue. The steel structure norms, in order to constantly improve the system of steel lay the necessary technical foundation and basis.（3） At present, the portal frame light steel structure and pressure plate arch shell structure of cost per unit area, Similar single-storey steel and concrete structure approximately the same, or even lower; and light steel structure of the higher levels of commercialization, production and installation rate will reach each class 700 -- 1000 square meters, much faster than the reinforced concrete structure. In recent years, expansion of the market quickly. Tall steel structure of the composite price is higher than the reinforced concrete structure similar 4% -- 5%, but the seismic performance and Construction is fast, especially in high-rise buildings to be used. In November 1997 the Ministry of Construction issued the "China Building Technology Policy", made clear that development of steel construction, construction steel and construction steel construction technology specific requirements, China's long-term practice of "reasonable Steel" policy to "encourage Steel" policy. Steel will promote the popularization and application play a positive role.（4）the steel industry will see a number of characteristics with the strength of the professional design institutes, research institutes, output over 200,000 tons of large-scale steel factories, dozens of first-class technology and advanced equipment to the construction and installation enterprises。