How to choose the suitable steel structural system in Prefabricated steel structure buildings?
It should consider followings factors such as building height and aspect ratio, seismic fortification category, seismic fortification intensity, site category, and construction technical conditions.
Steel frame structure, steel frame-support structure, steel frame-ductile wall structure are suitable for multi-story steel structure residential and public buildings; staggered truss structure is suitable for dormitories, hotels or apartments with intermediate corridors; portal steel frame structure is suitable for single High-rise supermarkets, workshops or warehouses. The low-rise cold-formed thin-walled steel structure is suitable for low-rise buildings with cold-formed thin-walled steel as the main load-bearing member and the number of floors is not more than 3.
(1) Steel frame structure
Steel frame structures are mainly used in office buildings, residential buildings, teaching buildings, hospitals, shopping malls, parking lots and other multi-story buildings that require large open spaces and relatively flexible interior layouts.
The steel frame structure system can be divided into semi-rigid frame and fully rigid frame, which can adopt larger column spacing and obtain larger use space, but due to the small lateral force rigidity, the use height is limited to a certain extent. The maximum applicable height of the steel frame structure is determined according to the local seismic fortification intensity, 7 degrees (0.1g) can reach 110 meters; 8 degrees (0.2g) can reach 90 meters.
The steel frame structure mainly bears vertical load and horizontal load. The vertical load includes the structure's own weight and the live load of the floor (roof). The horizontal load is mainly wind load and earthquake.
(2) Steel frame - supporting structure
For high-rise buildings, due to the large wind load and earthquake effect, the size of beams and columns and other components will also increase accordingly, which loses economic rationality. At this time, supports can be set between some frame columns to form a steel frame-support system.
The maximum applicable height of the steel frame-support system is determined according to the local seismic fortification intensity, which can reach 220 meters for degree 7 (0.1g), and 180 meters for degree 8 (0.2g).
Under the action of horizontal load, the steel frame-bracing structure can be divided into central bracing frame, eccentric bracing frame and buckling restrained bracing frame through the coordination of the deformation of the floor, forming a double lateral force resistance structure system by frame and bracing.
(3) Staggered truss structure
The staggered truss structure system, also known as the staggered truss structure system, is mainly suitable for medium and high-rise residences, hotels, apartments, office buildings, hospitals, schools and other steel structure houses whose plane is rectangular or composed of rectangles, and combines the spatial structure with the high-rise structure. Combined organically, a column-free space of 300 to 400 square meters can be obtained in a high-rise structure.
(4) Low-rise cold-formed thin-walled steel structure
A structure made of cold-formed steel as the main load-bearing member.
Cold-formed thin-walled steel is made of steel plate or strip steel with a thickness of 1.5-5 mm, which is formed by cold processing (cold bending, cold pressing or cold drawing). The thickness of the same section is the same, and the corners of the section are arc-shaped. In public buildings and residential buildings, thin-walled steel can be used to make various structures and components such as roof trusses, rigid frames, net frames, purlins, wall beams, and wall columns.
With the development of prefabricated steel structure buildings, especially the increase of steel structure residential projects, a number of new structural systems have emerged. It can be roughly divided into two categories: one is to optimize and expand the original steel structure system, and adopt steel composite members or steel-concrete composite members to make the steel structural members adapt to the layout requirements of steel structure residential units; the other is to improve the speed of assembly and construction solves the problem of large amount of welding on site, resulting in a fully bolted connection structure.
Qingdao Xinguangzheng is a premier choice for prefabricated steel structure buildings in China. We supply light-weight steel building systems, and heavy duty steel structures in various sizes and designs.
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