Analysis on the Evolution Process of Dynamic Performance of Single Bolt Connection

The connection quality of the bolted joints directly determines the service performance and reliability of the structure. However, there will always be a certain degree of loss in the bolt clamping force during the long-term service, accompanied by degradation of the mechanical performance. Herein, the experimental study on the single bolt connection was carried out to analyze the evolution process of dynamic performance. The clamping force was continuously monitored after tightening to obtain a quantitative analysis of its loss with and without external loads. The loosening curves of the clamping force with the service time was established respectively considering the main influencing factors. Transverse cyclic loads were applied to obtain the service loosening data of the bolt clamping force. The dynamic performance characterization parameters of the structure under different clamping forces were obtained through the modal test. On the basis of established force-performance relationship, the service conditions of the connection structure were evaluated to propose a performance evolution equation that varies over time. A comprehensive understanding of the service and evolution process of bolted joint was obtained through the experiment and analysis in this work. It provides an important reference significance in the performance prediction and control of bolted joints, which can help design a more reasonable structure.