Multi storey building steel structure system multi storey light plastic building steel structure system takes welded or hot-rolled H-section steel as the main load-bearing frame structure, profiled steel plate composite floor, light envelope structure and internal partition. If necessary, support shall be set to improve lateral stability. In Europe, the United States, Japan and other countries, the main structural form of public or residential buildings is light steel frame. The steel consumption of profiled steel plate composite floor system is about 40 ~ 50kg / m2, mainly using hot-rolled or welded H-shaped steel beams and columns or square, round tube members M The construction speed of light steel structure frame is faster than that of reinforced concrete. The composite floor can ensure the overall stability of steel beams and improve the rigidity and bearing capacity of basket beams. However, the technical requirements for construction and installation are high, and the support may have a certain impact on the use.

The steel structure of multi-storey light residential buildings is mainly used for residential buildings, multi-storey industrial plants, schools, hospitals, offices, entertainment and other public buildings, as well as commercial buildings such as supermarkets, retail stores and department stores, and the addition, reconstruction and expansion of old buildings. The column spacing is between 6 and 12m. The typical multi-storey light residential steel structure system is composed of foundation, frame beam column, wall beam, purlin, roof panel, wall panel, roof support, column support, floor beam, profiled steel plate floor, etc. The load-bearing structure shall be designed as a plane frame or a space frame. If necessary, support between columns shall be arranged to ensure the overall stability and reduce lateral displacement. The floor adopts the primary and secondary beam system. The profiled steel plate composite floor or the precast slab and cast-in-place slab can be overlapped. The roof can use purlins and profiled steel plates. The internal wall is a light partition. The external wall adopts profiled steel plates or other light wall structures. Huizhou steel structure.

At present, some multi-storey factories in China have begun to adopt the above structure. The development of multi-storey residential system provides a huge potential market for the application of multi-storey light residential steel structure. The use of composite beams can achieve the rigidity of the basket structure, reduce the size of the structure, and increase the use space of the building. The web opening beam can provide passage space for equipment and pipes, but stiffening ribs should be set around the hole to improve the shear capacity. Circular or hexagonal honeycomb beams are used for the secondary beams of the building cover. The beam height can be increased by 70% without increasing the steel consumption, and the span can be further increased by the composite truss.

The steel structure design of multi-storey light-duty buildings is based on the code for design of steel structures (gb17-88). The code for the design of steel structures of light-weight buildings prepared by China Association for engineering and building standardization is being submitted for approval. According to the analysis and design of the space rigid frame, the non column support is designed as a side moving frame, the column section is H-shaped or box shaped, the beam is I-shaped solid web beam, the main beam and the column are rigidly connected or hinged, and the primary and secondary beams should be hinged; Profiled steel plate or prefabricated plate laminated floor can be used for composite floor. The floor beam shall be designed according to the composite beam, and the number and size of shear members such as bolts shall be arranged according to the stress requirements. If the combined action is not considered, shear members such as bolts can be set according to the structural requirements. The honeycomb beam can not only improve the utilization rate of the basket section, but also provide a passage space for equipment pipes. There are no clear provisions on the design and calculation of honeycomb beams in China, but there are experimental research data at home and abroad for design. The longitudinal force transmitted by the column support, wall support and roof support shall be designed according to the wind resistance, seismic resistance and structural requirements. The new profiled steel plate ribbed composite floor is supported on the widened lower flange (slimdek) of the beam. Equipment pipes can be arranged between the beam ribs. The overall structural height of the beam and plate is only 300mm, which can also improve the fire resistance of the beam, but it needs to solve the torsional design problem of the beam.