Testing and Analysis on Progressive Collapse-Resistance Behavior of RC Frame Substructures under a Side Column Removal Scenario

Abstract

This paper presents an experimental and analytical progressive collapse-resistance evaluation of reinforced concrete (RC) frame substructures under monotonic vertical displacement of a side column, simulating a column removal scenario. A two-span, two-bay, and single-story one-third scale model representing a segment of a larger space frame structure was tested. The downward displacements of the top of the removed side column are imposed until failure. Frame collapse is defined herein as the rupture of tension steel bars in the floor beams. The study provides insight into the behavior and failure modes of the frame structure under a side column loss, including the development of catenary action in the beams and tensile membrane action in the slabs. Based on the experimental observations and theoretical analysis, a simplified calculation model of progressive collapse-resistance capacity of RC frame substructures due to the loss of a side column is established, which establishes the foundation for progressive collapse assessment of RC frame structures. The reliability of the proposed model is verified by experimental results.