Due to the complexity of the bolted connection of membrane components in membrane couplings, a simplified finite element model of membrane components is established based on the thin layer element method. A new simplified modeling method, the structural segmentation method, is proposed for this model. The elastic modulus and Poisson"s ratio of the joint surface elements in the structural segmentation method are determined by calculating the static stiffness of the model, which is more efficient than the traditional thin layer element method. On this basis, the modal simulation results of the structural segmentation method model are compared with the experimental results. The results show that the vibration modes obtained by the structural segmentation method modal analysis agree well with the first three vibration modes measured by the experiment, and the natural frequency error is within 10%. This verifies the accuracy of the modeling method, providing a fast and effective method for dynamic modeling of the joint of the membrane assembly.