What are the design methods for prefab metal workshop?
1. Plastic design method
When the plastic properties and strength of the steel structure components in the prefab metal workshops are higher than the standard load multiplied by the safety factor, the plastic design method is usually used in the structural analysis of the internal force of the components. This method has certain advantages, mainly in that it can allow the redistribution of internal forces after the structure enters plasticity. However, it must be noted that its structure and members need to have sufficient ductility, and the proportional size of the flange and section web must be strictly limited according to actual needs during the design process.
2. Allowable stress method
The permissible stress method of the prefab metal workshop also needs to adhere to certain principles in the process of design and application. Specifically, the calculated stress of the structure is required to be smaller than the allowable stress specified in the structural member design. When calculating the stress of steel structure components, it must be designed according to the specified standard load. The calculation is obtained by the first-order elastic theory, and is determined by an ultimate stress or yield stress with a material removal and a safety factor greater than 1. There are certain defects in this design method, and it needs to be selected scientifically according to the actual situation in the application process.
3. Limit state method
The emergence of the limit state method can effectively solve the defects in the above two methods and better improve the design quality. The limit state method uses load sub-factors and resistance instead of a single safety factor. Under the action of load, the prefab workshop structure can reach two limit states within a certain period, that is, the limit state under normal use state and the limit state of bearing capacity. The latter corresponds to the safety of the structure, mainly referring to the structural damage caused by the fracture and plastic deformation of the structure. Limit state is the most widely used design method in the design of prefabricated metal workshop, which can effectively improve the design quality and ensure the stability of building steel structures.
