Partial Collapse of John Purdue Block, a Historic Brick Masonry Structure

This paper discusses the partial collapse of John Purdue Block, a historic masonry structure in Lafayette, Indiana. The collapse occurred while the structure was being renovated and modified to prepare it for a new occupancy and usage. Prior to the start of the project, masonry strengths were not assessed or even estimated, and the primary structural elements were not analyzed for the proposed changes in loading and geometry. Relatively modest loads on the masonry walls and columns, coupled with a long-term performance without distress, may have provided a false sense of confidence that the structure could safely withstand comparatively minor changes in geometry and loading. Subsequent testing and analysis revealed the cause of the failure to be localized compressive stresses that exceeded the ultimate capacity of the brick masonry.