This paper proposes a simple lattice model for collapse analysis of RC bridges subjected to earthquakesby using the extended distinct element method (EDEM). In the model, a concrete element consistsof lumped masses connected to one another by springs, and a reinforcement bar is represented by adiscrete model or an integrated model. The proposed lattice model is simple but its parameters arereasonably defined. It has fewer element nodes and connecting springs, which will be of benefit byshortening the CPU time. The processes to determine the initial stiffness of concrete and steel springs,the parameters of the constitutive model and the fracture criteria for springs are described. A re-contactspring model is also proposed to simulate the re-contact of the concrete after fracture of springs; anda general grid searching method is used to decrease the CPU time for judging re-contact after fracture.The lattice model is assessed by numerical simulations and experiments. As an application, a damagedsingle-column pier subjected to the Kobe Earthquake in 1995 is analysed by EDEM with the proposedmodel. The simulation results indicate that the proposed model predicts well qualitatively the collapseprocess of RC bridges. Copyright