1. Low consumption of light steel structure residence is the reduction advocated by circular economy, which is to reduce the flow of materials and energy entering the production and consumption process, save the use of resources from the source, and is the basis for developing circular economy. First of all, analyze from the resource consumption. Because the enclosure structure of light steel structure residence is wallboard and the external wall is composite thermal insulation wallboard, the wall thickness of light steel structure residence is thinner than the other two structures. For example, KALC wallboard, the outer wall thickness is generally 175mm, and the inner wall thickness is not more than 125mm, generally 100mm, while the outer wall thickness of masonry structure residence is generally 200-360mm, the inner wall thickness is 200-240mm, and the inner and outer wall thickness of concrete structure residence is generally 200 mm and 2000 mm. Take a residential building with a building area of 1 1,000 square meters as an example. Generally, the external wall area is 0.5 times of the building area, and the internal wall area is about 1.0 times of the building area. Suppose the height of the building is 3m, the thickness of the inner wall and the outer wall of the light structure residential building is 100mm and 175mm. The wall of light structure residence is 562.5m3, and the thickness of inner wall and outer wall of concrete structure residence is 200mm and 250mm respectively. The concrete structure residential wall is 975m3, and the concrete structure residential wall is 0.73 times that of 65438+ light structure residential building. The concrete consumption of light steel structure residence is much less than that of masonry structure residence and concrete structure residence, so the consumption of sand, stone and cement is much less, thus reducing the exploitation of natural resources, saving land and reducing the damage to non-renewable resources. It can also be seen that the use of wallboard greatly reduces the consumption of resources, and the heat preservation is stronger, reducing the heating energy consumption. In addition, due to the light weight of light steel structure residence, the foundation area can be reduced accordingly, and the amount of soil taken during foundation construction is also reduced, which can save land. General light steel structure houses are fully decorated: design integration, construction integration and management integration, avoiding secondary decoration and effectively saving building materials. However, in brick-concrete or reinforced concrete rough houses, due to the disconnection between civil design and decoration design, repeated construction such as wall demolition and re-wiring (when decorating, it is conservatively estimated that wiring is l00m for each household, and 50% of the households will demolish the wall for 5m2) will cause great material waste and produce a lot of construction waste. Second, consider reducing environmental pollution. First, the light steel structure residence reduces the emission of construction waste; Second, it reduces the consumption of cement, thus reducing the emission of carbon dioxide; Thirdly, because the light steel structure adopts factory production and dry construction, it reduces the production water consumption, reduces the dust generation and greatly reduces the pollution and damage to the environment. Second, the low energy consumption economic analysis of light steel structure residence 1, light steel structure residence foundation form. Light-steel residential buildings are lighter than brick-concrete structures and reinforced concrete structures 1/2- 1/3, which can significantly reduce the cost of foundation treatment, especially in soft soil areas. At the same time, the light steel structure building is light in weight and the comprehensive transportation cost of building materials is low. The overall weight of light steel structure residence is light because: firstly, the steel used in this structure has high strength-to-weight ratio and performance. If the same strength is to be achieved, the consumption ratio of concrete to steel is 7:1; Secondly, in the structural system of light steel residential buildings, the use of lightweight materials for walls and floors plays an important role in reducing the main weight, which will greatly reduce the main weight. Most of the light-weight residential walls are made of light materials, such as gypsum board, ALC board, OSB board, etc. After construction, the main structure is about 30% lighter than other traditional materials. If the decoration of residence is considered, the main structural weight of light steel structure system is 1/4- 1/6 for brick-concrete structure and 1/2 for reinforced concrete structure. The weight reduction of the superstructure has brought many benefits to the lower foundation. If the superstructure adopts steel structure, the foundation can be reduced by nearly half, and then the requirements for foundation durability of the foundation are greatly reduced. Therefore, light steel structure houses adopt shallow foundations, and generally strip foundations can be used, which can make the foundation treatment simple and reduce the cost, especially when soft soil foundation is encountered. 2. Economic analysis of light steel structure residence. Light steel residence has high strength and small beam-column section, which can increase the effective use area of the building and increase the intrinsic value of the house. Now take three kinds of multi-storey houses with different structures in the same area as an example for analysis. Project 1: Six-storey residential building with brick-concrete structure, with construction area of1300m2; Project 2: A staff residential building of a certain group, with six floors and reinforced concrete structure (reinforced concrete structure), with a construction area of1200m2; Project III: Six-story light steel residential building with construction area of 1500m2. Through calculation, analysis and comparison, the building area utilization rates of three different structures are 73%, 78.4% and 92% respectively, that is, per 100m2 of building area, the light steel structure system is higher than the brick-concrete structure system by 17 m2, and higher than the reinforced concrete structure (reinforced concrete structure) by 16 m2. If the current average residential sales price is 3,000 yuan /m2, after residents buy the house of 100m2, if the house is light steel structure, compared with the brick-concrete structure, the implied income that residents can get is 3,000 yuan-17510,000 yuan; Compared with the R.C structure, the implied income that residents can get is: 3000- 1 1.6=34800 yuan. At the same time, due to the limitation of strength and stiffness, reinforced concrete structure and brick-concrete structure houses can not build large rooms, which affects the layout of rooms and can not meet the needs of different family structures. Residents are dissatisfied with the apartment type, and the wall structure of the room is destroyed, which not only brings hidden dangers of the wall structure and the overall earthquake resistance, but also wastes the decoration expenses of residents. 3. Light-weight steel structure residence has fast capital turnover and high utilization rate. The construction of light-weight steel residential buildings is fast, for example, it takes only 45 days to build a 6-storey house with a area of 2000 square meters. The light steel structure residence adopts the way of industrial production, and the structural members are manufactured in the factory and transported to the construction site for installation. This mode of production enables many operations to be completed cross-directionally, such as factory production and site installation at the same time, which is not affected by weather and seasons, and is conducive to reasonable arrangement of construction plans of various sub-projects. The improvement of labor productivity can shorten the construction period, reduce the time occupied by funds and speed up the capital turnover. Nowadays, in the financial situation of high loan interest rate, the construction period index is as important as the cost index, and the construction speed has become an important factor in choosing the structure type. The adoption of light steel structure residence can speed up the capital turnover and reduce the cost of capital use. For example, the developer borrows 6,543,800,000 yuan from the bank. If the current annual loan interest rate is 6.57%, the savings are: total funds-annual loan interest rate-days ÷ 365 =1000-6.57%-100 ÷. At the same time, the construction period of light steel residential buildings is shortened, and the number of on-site workers required is reduced by nearly half compared with other structures, which reduces labor costs and saves a lot of money. Because light steel structure is not widely used in residential buildings in China, people are not very familiar with it, and there is a misunderstanding in concept that steel structure residential buildings are expensive. We should have a comprehensive understanding of the cost of light steel structure. If only the structural cost is considered, the cost of light steel structure building is higher than that of traditional structure building, but considering the advantages of a structural system, we must consider its comprehensive benefits. The total investment of residential construction projects includes engineering costs, demolition costs, land acquisition costs, etc. The project cost only accounts for 50% of the project investment. Engineering costs include structural costs, decoration costs and equipment costs. The structural cost only accounts for less than 30% of the project cost. The structural cost is divided into superstructure and foundation cost, and the superstructure cost is only 50%-70% of the foundation cost. Steel structure is only the superstructure of the project, accounting for only 7%- 10% of the total investment.

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