Bolt connection equivalent modeling method and device

The invention provides a bolt connection equivalent modeling method and device. The method comprises the following steps: obtaining a hysteretic curve corresponding to bolt connection according to target experimental data; according to the hysteretic curve, determining the rigidity continuity characteristic of the transition from the microscopic slip to the macroscopic slip; on the basis of a target five-parameter Iwan model, determining a corrected initial four-parameter Iwan model on the basis of the rigidity continuity characteristics; and on the basis of target experimental data under a preset load condition, determining specific numerical values of target parameters corresponding to the initial four-parameter Iwan model through a restoring force and energy dissipation relation curve fitting mode, and obtaining a target four-parameter model. By adopting the method disclosed by the invention, new constraints can be added to variables to reduce model parameters, and meanwhile, residual stiffness and stiffne