Progressive collapse simulation based on DEM for single-layer reticulated domes

The conventional discrete element method (DEM) is usually applied to solve the elastic problems of granular materials. The DEM fibre constitutive model, which can consider the plasticity development of a cross-section, is derived, and then the fracture simulation algorithm for members is established based on the elastic-plastic analysis using this fibre model. Thus, the DEM is extended to study the continuum structures. Next, the proposed method is applied to the collapse simulation process of two single-layer reticulated dome test models. The simulation results, including the collapse process and the fracture location of joints, agree well with the shaking table test measured response. In addition, the displacement responses of representative nodes and axial force responses of representative members also are consistent with the experimental measured response, which demonstrates the accuracy and validity of this method. This study provides a new numerical analysis method for further investigation of the complicated mechanical behaviour-including large deformation, material nonlinearity and fractures-of large or super-large member structures.