Seismic collapse simulation of spatial RC frame structures

A special DEM (distinct/discrete element method) model employing spring model designed for RC members is proposed to simulate seismic collapse of spatial RC frame structures. The failure criteria are developed. Methods to get the rotational displacement and the contact detection algorithm prove good accuracy and efficiency. Taking advantages of this model, a Visual C++6.0 based simulation program, 3DCollap1.0, is developed and then verified by simulating the shaking table test of a RC frame featuring strong-beam-weak-column from minor and moderate earthquakes to severe earthquake which results in structural collapse. The collapse process of a strong-column-weak-beam RC frame is also successfully simulated.