The node structure is the core technical link of the prefabricated steel structure industrial warehouse, and its design rationality and connection reliability are directly related to the overall structural safety.The nodes of the steel structure warehouse mainly include beam and column connection nodes, column foot nodes, support nodes, purlin connection nodes, etc.The connecting nodes of beams and columns are usually connected by end plates and fixed by high-strength bolts.The node design needs to determine the thickness of the end plate, the number of bolts and the arrangement according to the force, so as to ensure that the strength of the node is not lower than the strength of the component.Stiffeners need to be set in the node domain to prevent local buckling.The column foot node needs to withstand the bending moment and shear force of the bottom of the column. It usually adopts exposed column feet, which are fixed to the foundation by anchors, and shear-resistant keys are set to transmit horizontal forces.

The reliability of the connection depends not only on the design calculation, but also closely related to the quality of construction.High-strength bolt connections need to control the pre-tension, and the torque method or angle method is used for construction to ensure that the bolts reach the specified pre-tension value.The order in which the bolts are tightened must be reasonable to avoid additional stress on the nodes.On-site welding needs to be operated by a licensed welder and carried out according to the parameters determined by the process evaluation. The welds need to be visually inspected and flaw detected to ensure internal quality.For important nodes, weld heat treatment may be required to eliminate residual stress.After the node is installed, it needs to be retested to check the deformation and ensure that it meets the design requirements.

In the design of node structure, it is also necessary to consider the convenience of construction and the inspectability and repairability.The node form should be easy for the components to be hoisted in place and adjusted, and the bolted connection space should be sufficient to facilitate the operation of the wrench.The position of the weld should be easy to apply welding and inspection, and avoid operating in a small space.For nodes that are difficult to inspect or repair, more reliable design and stricter quality control measures should be adopted.After being put into use, the condition of the nodes needs to be checked regularly, especially those that are under dynamic load or in a corrosive environment, and the problems found will be dealt with in a timely manner.This kind of careful design and strict control of the node structure ensures the connection reliability and structural safety of the steel structure prefabricated industrial warehouse during the whole life cycle.