A number of computational tools have been developed in recent years to simulate the disproportionate (progressive) collapse behavior of multi-story reinforced concrete buildings. Under disproportionate collapse scenarios, beam-column connections of moment-resisting reinforced concrete frames undergo large rotations in addition to sustaining large axial tension forces as a result of the development of catenary action in the beams. Because of this large tension force development, it is important to characterize the interaction of bending moment, shear and axial force accurately in modeling the beam-column connections up to failure. However, it has been difficult to validate the computational models that have been developed for the disproportionate collapse behavior of multi-story concrete buildings due mainly to the lack of experimental data. This paper presents two types of computational models, detailed and reduced finite element models, of reinforced concrete frame structures. To validate the numerical models, two full-scale tests of beam-column assemblies were carried out under a column removal scenario. One of the assemblies represents part of a ten-story reinforced concrete frame building designed for the high seismic region (Seismic Design Category D), and the other represents part of a similar frame building designed for the moderate seismic region (Seismic Design Category C). The analyses showed a good agreement between the experimental results and the computational predictions. Both detailed and reduced models were capable of capturing the primary response characteristics.
Conference Dates: September 18-22, 2011
Conference Location: Seoul, -1
Conference Title: The 2011 International Conference on Advances in Structural Engineering and Mechanics
Pub Type: Conferences
buildings, computational model, computer simulation, concrete structures, disproportionalte collapse, finite element analysis, progressive collapse, testing