MODELING PROGRESSIVE COLLAPSE IN REINFORCED CONCRETE FRAMED STRUCTURES

摘要

The paper presents an analytical formulation of an element removal algorithm based on dynamic equilibrium and the resulting transient change in system kinematics. The algorithm is implemented into an open-source finite element code, is numerically validated using a benchmark problem with simple element removal criteria, and is able to capture the effect of uncertainty in member capacity. Realistic element removal criteria are introduced for mode-dependent gravity load collapse of seismically deficient and retrofitted reinforced concrete (RC) columns. An application is presented using a RC 3-bay, 3-story frame previously tested on a shaking table. In this application, comparison between the computationally predicted and experimentally observed collapse modes is presented giving confidence in the developed analytical formulation.