In order to comprehensively improve the technical level of the construction industry, the Ministry of Housing and Urban-Rural Development has announced a notice on the promotion and application of "10 New Technologies in the Construction Industry (2017 Edition)". The following is the specific content of "10 New Technologies in the Construction Industry (2017 Edition)". As a first-class constructor and on the way to a first-class constructor, you must know:

 

Application Technology of Steel Structure Residence

 

5.10.1 Technical content

 

Steel structure residential building design should be integrated residential building as the goal, should be based on the principle of modular coordination to achieve the standardization of components and equipment products. Steel structure is adopted as the main load-bearing structure system of residential buildings. For low-density residential buildings, cold-formed thin-walled steel structure system should be adopted. The wall is wall column and gypsum board, and the floor is C- type grid and light plate. For multi-and high-rise residential structural systems, steel frame, frame support (wall panel), cylinder structure, steel frame-steel concrete combination and other systems can be selected, the floor structure should adopt reinforced truss floor slab, cast-in-situ reinforced concrete structure and assembled integral floor slab, and the wall should be prefabricated light-weight slab or light-weight block. At present, the main development direction of steel structure residence can be applied to multi-storey light steel structure with steel plate shear wall or mixed with common steel; It can be applied to low and multi-storey steel frame system based on square steel tube concrete composite special-shaped column and outer rib ring plate node; It can be applied to high-rise mixed structure composed of steel frame and concrete cylinder or frame structure supported by strip steel; as well as the frame-support and frame-core barrel system based on the square steel pipe concrete combination special-shaped column and the outer rib ring plate node, as well as the steel pipe beam combination shear wall structure system.

 

The steel components of light steel structure residence should be hot rolled H-beam, high frequency welded or ordinary welded H-beam, cold rolled or hot rolled steel pipe, steel special-shaped column, etc. The structural column materials of multi-storey steel structure residence can be pure steel column or steel pipe concrete column, etc. The column cross-sectional shape can be rectangular, circular, L-shaped, etc. The exterior wall body can be sand aerated plate, grouting material wall plate or autoclaved aerated concrete block, the inner wall can be made of light steel keel gypsum board and other plates, and the floor slab can be reinforced truss floor bearing slab, laminated slab or cast-in-situ slab.

 

In addition to the common assembled steel structure residential structure system, modular steel structure buildings began to develop. Modular building is a new type of building form that divides traditional houses into modular units with a single room or a certain three-dimensional building space. Each unit is prefabricated and decorated in the factory, and the unit is transported to the construction site and connected as a whole. According to the different structural forms, it can be divided into: all-module building structure system and composite module building structure system, composite module building structure system can be divided into: module unit and traditional frame structure composite system, module unit and plate structure composite system, outer frame (mega frame) module building structure system, module unit and shear wall or core tube composite structure system; the outer wall panel of the module can be aerated concrete plate, thin plate steel bone composite light exterior wall, lightweight aggregate concrete and rock wool board composite wall panel; The base plate of the module can be reinforced concrete structure base plate and light structure base plate. The top plate can be double-sided steel plate sandwich panel.

 

The construction of steel structure housing should take industrialization as the goal to do a good job in the supporting work of wall panels, and do a good job in the promotion of steel structure housing on the basis of pilot projects.

 

5.10.2 Technical indicators

 

The design of steel structure residential structure should meet the industrial production requirements of factory production and on-site assembly. The design of components and nodes should be standardized, generalized and serialized. The assembly rate of building structure should be reasonably determined in the structural design.

 

Steel performance should be in line with the current national standard "steel structure design code" GB50017 and "building seismic design code" GB50009 the provisions of high performance steel can be preferred.

 

The steel structure residence shall be designed in accordance with the current national standard "Technical Standard for Prefabricated Steel Structure Building" GB/T 51232, and its seismic fortification category shall be determined according to the provisions GB50223 in the current national standard "Classification Standard for Seismic Fortification of Building Engineering". The seismic design shall be carried out according to the GB50011 of the current national standard "Code for Seismic Design of Buildings. The structure height of more than 80m buildings should check the comfort of wind load.

 

The fire rating of steel structure residential buildings shall be determined according to the current national standard "Code for Fire Protection Design of Buildings" GB 50016. Fireproof boards shall be preferred for fireproof materials. The thickness of the boards shall be determined according to the fire-resistant time limit and the product standard of the fire-resistant board. The fire-resistant time limit of load-bearing steel components shall meet relevant requirements.

 

5.10.3 Scope of application

 

Cold-formed thin-walled steel and light steel frame for the structure of the light steel structure can be applied to low, multi-storey (6 layers, 24m below) residential construction. The maximum applicable height of the multi-high-rise fabricated steel structure residential system shall comply with the provisions of GB/T 51232, the main reference values are as follows:

 

Table 5.1 Applicable maximum height of multi-storey fabricated steel structure (m)

 

For the steel structure module building, the module building of 1~3 layers should adopt the whole module structure system, the module unit can adopt the container module, and the connection node can be connected by the container angle piece; the module building of 3~6 layers can adopt the whole module structure system, and the unit connection can adopt the beam connection technology; the module building of 6~9 layers can adopt the prestressed module connection technology, A structural system combining modular units with shear walls or core tubes is required for more than 9 floors.

 

The construction of steel structure housing should take industrialization as the goal to do a good job in the supporting work of wall panels, and do a good job in the promotion of steel structure housing on the basis of pilot projects.