The development of modern construction increases the requirements for the reliability and accuracy of determining the stress-strain state of structures, nodes and details of designed objects. At the same time, today it is difficult to imagine the calculation of any structure without the use of modern software. When calculating the building as a whole, all joints, abutments and connections, as a rule, are specified in a simplified manner. At the same time, the special attention should be paid to the calculation of nodes connecting structures to each other, since, depending on the operating conditions of the node, a different distribution of the stress-strain state is possible, which in turn affects the geometric characteristics and operation of the structures. Thus, the calculation scheme of the node should reflect its real behavior as part of the structure, which, in turn, can lead to the complication of model creation, significant time costs and errors in calculations. Models of materials and individual components (bolts, welds) should also match the real ones as much as possible. This process is most relevant in the design of nodes of metal structures. The design of typical nodes is carried out using serial solutions, standard methods and manuals, but in the case of non-standard nodes of a complex shape, it is advisable to use the component method of finite elements reflected in foreign literature. This approach is implemented in the Idea StatiCa software complex. The model made in this program gives the modern engineer a sufficient amount of information about the behavior of the unit, its stress-strain state and the coefficients of use of individual components, as well as about the results of joint inspections. The results obtained during the calculation of the frame unit using this complex were compared with the calculations performed manually according to the methods of various regulatory documents.