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ii This research investigates the progressive collapse vulnerability of an existing steel building, Haskett Hall, on the Ohio State University (OSU) campus. The building was tested by removing one of the first-story columns to observe its collapse resistance and to evaluate the effectiveness of current modeling and analysis guidelines. Progressive collapse is a partial or complete collapse of a structure due to the loss of a supporting element, a column in this case. Few researchers have been able to conduct full-scale experiments to understand the progressive collapse mechanism. One previous OSU study tested the vulnerability for progressive collapse of a steel building in Northbrook, Illinois, and another building on the OSU campus. It was concluded that more detailed models are needed to account for nonlinearity, three-dimensional and dynamic effects in analysis of a building frame including beams and columns surrounding the removed column. To address these issues, in this research deflections and deformations within the neighboring beams and columns were measured during column removal. A structural analysi