The utilization rate of steel structure workshops is also accompanied by more and more people’s understanding of it, and at the same time, because steel structure buildings can be applied to almost various usage conditions. Whether it is industrial buildings or civil buildings, steel structure buildings can always be done perfectly. Therefore, steel structure buildings have occupied more and more construction markets because of their excellent characteristics.
However, in the planning, according to its characteristics, it can better play the role of steel structure.
Steel has a high thermal conductivity, with a thermal conductivity of 50W/(m.c). When heated to above 100°C, its tensile strength decreases and plasticity increases. When the temperature reaches 250°C, the tensile strength of the steel increases slightly, but the plasticity decreases, showing blue brittleness. When the temperature reaches 500°C, the strength of the steel drops to a very low level, which will cause the steel structure to collapse. Therefore, when the ambient temperature of the steel structure reaches 150°C or higher, it is necessary to develop a heat preservation and fire prevention plan.
The placement of the roof support system should be decided according to conditions such as the span, height, column network placement, roof structure, crane tonnage, and seismic fortification intensity of the location area. In general, roof structures with or without purlin systems should be equipped with straight supports. In the purlinless system, the large roof panel has three points welded to the roof truss, which can support the upper chord, but the constraints of construction conditions and equipment requirements must be considered.
Temperature changes will cause deformation of the steel structure workshop, causing temperature stress to the structure. When the plant plane standard is large, in order to prevent excessive temperature stress, temperature expansion joints should be set in the vertical and horizontal directions of the plant, and the section length can be implemented in accordance with the steel structure standard. Temperature expansion joints are generally treated with double columns, and longitudinal temperature expansion joints can be provided with rolling supports at the roof truss supports.
The surface of the steel arched roof will corrode when exposed directly to the atmosphere. When the steel structure workshop has corrosive media in the air or the steel structure is in a humid environment, the corrosion of the steel structure workshop will become more significant and severe. The corrosion of the steel structure will not only reduce the cross section of the component, but also cause rust spots on the surface of the steel component. When the component is stressed, it will cause stress concentration and premature failure of the structure.
Therefore, in the design of steel structure, we need to give full play to the role of steel structure according to its characteristics.