At present, Japan's main building architecture wood structure, reinforced concrete structures, steel and other residential buildings. Japanese government "Building Standards Law" in the housing and construction materials proposed seismic standards are very strict mandatory standards, the request must go through the design standard of review, the use of building materials through professional organizations certified by a professional construction team for construction. Japanese seismic importance can be divided into three stages. From the beginning of last century, in 1923, after the Great Kanto Earthquake, Japan has enacted a law requiring building houses must calculate the shock strength, attaches great importance to the building seismic design; 1978 Miyagi earthquake in Japan, the Japanese government in 1981 promulgated the " New Seismic Design Law "to amend the building's earthquake standards; 1995 Kobe earthquake, the Japanese government has further enhanced earthquake standards. Japanese law on building seismic safety requirements are very strict. Japan's "Building Standards Law" stipulates that new buildings must meet suffered a major earthquake does not collapse, suffered moderate earthquake without damage.

Seismic standards through national legislation to be published in the implementation is even more rigorous and meticulous. In Japan, a construction permit to get started, you must submit seismic report, after confirmation through the relevant departments to start. Japan attaches great importance to the new technology's role in housing earthquake, which "shock resistance building", "isolated buildings", "curb earthquake architecture" three technologies are valued and developed. Shock resistance is the use of bolts building, walls and other buildings constructed elastic absorb seismic energy; isolated building between floors in the ground or placed bearings, rubber mats absorb seismic energy, prevent the building shake; suppression earthquake building is the use of suppression shock devices, such as wall dampers, ball and other technical solutions to absorb seismic energy, and thus control the entire building of the swing, reducing the extent of earthquake damage.

Japanese steel residential development has its specific historical conditions and social environment, especially in the last century, the Japanese government in every major city after the earthquake Revised Statutes, supplement and improve the building's seismic standards. Moreover, Japan's builders will be based on the extent of the damage and building a thematic study different scenarios and propose new technology solutions. Continuous improvement of the structural system architecture, focusing on the damage case and meticulous research; research and technological achievements can quickly get the government and the whole society's attention, and the promotion and application, which is well worth our study and construction enterprises reference.

Housing Industrialization has become the mainstream of development in Japan and trends in the construction industry, and has made considerable achievements supporting technology and mature management experience. From Japan, the number of residential projects in the construction site to see, the venue is small, the use of closed-end management. Whether wood, steel or reinforced concrete structure, industrial production, on-site assembly-type construction is the construction of the main forms of residential projects. Construction required for the major components are produced in a factory, transported to the site for assembly of construction, slab components supporting each other, Jiecha seamless counterpart to traditional building methods to bring revolutionary changes, greatly reducing construction waste emissions, reducing Hydro-site material loss, reducing on-site temporary construction facilities, to ensure project quality. In Japan, we visited the construction site, many live in and around the House floor buildings connected to structural columns for the dock crane with building climb, building materials transported through the inside of the building, the entire project by the safety net wrapped closed, safe, clean, have sequence.

The construction of multi-site production to take the way of building materials, equipment, transportation construction sites, on-site operations, the construction process unchanged for decades. This traditional mode of production because the management level differences and differences in the quality of personnel, resulting in a prominent site material waste, on-site management is extensive, serious waste water, waste discharge mishandling. Relevant data show that more than 50% of the residential development project duration can not be guaranteed, there is no schedule at hand over the contract period; There are more than 30% cost of the project exceeded the contract price. Duration and cost breakthroughs leading developer of investment costs, and ultimately increase the cost of this part are bound to be passed on to consumers. Site control, inspection weakening links, a large number of on-site construction work for inferior materials entering the site, the scene of shoddy behavior opens the door to engineering quality lay hidden.

Facing a new historical stage of development and achieve the sustainable development of the national economy, and take energy conservation, green building development, construction is simply to change the traditional mode of production. The industrialization of residential construction development direction is to achieve building products factory production, intensive management, standardization construction. The use of technical means to achieve the scientific control of resources, rational use of materials; industrial production can achieve strict quality inspection and testing instruments, strict quality process control to make the project a firm assurance. Residential product factory production, allowing workers to enter the factory to become industrial workers, help to improve the quality of construction personnel, improve skills, in order to ensure project quality guarantee. The on-site assembly of construction management, on-site, small footprint, high degree of mechanization of operations, helping improve efficiency, speed up the progress, reduce environmental pollution.

　　
　　Third, steel residential building energy efficiency, green obvious advantages

　　For structural safety and energy-saving considerations, Japan's high-rise buildings and public facilities are mostly steel structure system. Starting from the design, the use of standardized, using uniform product standards, the use of components for assembly. Japan's three-star, four-star hotels are mostly made ​​from steel and built of lightweight composite panels, giving the impression that is deeper guest bathroom system and decoration materials, sanitary ware --- a full bathtub, toilet bowl, washbasin, including floors, walls, is formed by an integral component mounting, wall wall decoration materials, bright and crisp, do not see concrete and tile, the materials used are the composite material of the material, all in factory production, reaching economic yet comfortable, environmentally-friendly and energy-saving effect of modernization.

Steel building materials can be recycled only, reuse, reduce construction waste emissions, but also because of its structural seismic performance, in our high-rise residential, schools, hospitals and other public facilities construction priority should be promoted. Because the characteristics of steel structures, facilitate the formation of a stable independent structure, internal and external wall materials to promote the use of new energy-saving panels, developed doors and windows, glass enclosed insulation function with new materials, specifications conducive to the development of standardized integral kitchen system, you can use fly ash and other industrial waste, or a variety of beautiful and practical development of new combinations of materials and so on, through the promotion of steel housing, driving new materials, new technology revolutionary change, gradually reduce sand, cement dependence and ultimately promote China's construction sector to achieve circular economy, environmental protection and sustainable development goals.

(The author is China Construction Metal Structure Association Committee and deputy director of construction steel)