Progressive Collapse Simulation of Reinforced Concrete Buildings Using Column Models with Strength Deterioration after Yielding

The full-scale shaking test of three-story reinforced concrete school buildings was carried out at E-Defense, the world largest three-dimensional shake table, from Sep to Nov 2006. Two specimens were tested: one was a bare frame building with old design and construction practices, and the other was strengthened with attached steel braces. A dynamic progressive collapse of the bare frame specimen occurred associated with shear and axial failure of short columns under the JMA Kobe motion. A method for the detailed analytical simulation of the shake table test was developed with columns members, in which shear deteriorating behavior after flexural yielding was incorporated. The Axial-Shear-Flexural Interaction Model is adapted in order to evaluate ultimate deformation capacity of the columns. Three-dimensional nonlinear static frame analysis was carried out with the column model considering shear deterioration. Axial and lateral hysteretic responses of the inner column in test are compared with the analytical responses to verify the model.