Experience in the operation of reinforced metal structures of industrial buildings has shown that under increased influence of static loads, units of frame elements rarely fail, which cannot be noted in the case of prolonged application of dynamic loads. As a rule, welded joints of fastenings of reinforcement elements are subject to destruction, which is the reason for conducting this study. During the work, the influence of residual welding stresses on the durability of reinforced frame assemblies under the influence of dynamic loads was revealed. The numerical modeling method was used using the Ansys SpaceClaim software package. The vibration strength of seams is determined by the height of the leg of welded joints associated with the transition of the material to the stage of deformation and displacement of structural units subjected to cyclic loading. It should be noted that fatigue failure is divided into two categories: high-cycle fatigue and low-cycle fatigue. High-cycle fatigue, when the number of cycles of load application is large (around 1e4 - 1e9). With this formulation, the stress level is usually lower in comparison with the ultimate strength of the material. Durability assessment, depending on the stress level, is usually used to calculate high-cycle fatigue. Low-cycle fatigue, when the number of cycles of the applied load is relatively small. Plastic deformation is often associated with low cycle fatigue calculations and results in reduced fatigue life. Assessment of durability depending on the level of deformation is more applicable to the calculation of low-cycle fatigue.