Progressive collapse behavior of rotor-type diagrid buildings

In this study, the progressive collapse-resisting capacities of axi-symmetric or rotor-type diagrid structural system buildings were evaluated based on arbitrary column removal scenario. For analysis models, 33-story buildings with cylindrical, convex, concave and gourd shapes were designed, and their nonlinear static and dynamic analysis results were compared. The effect of design variables such as the number of total stories, slope of diagrids and the location of removed members was also investigated. According to the analysis results, the rotor-type diagrid structures showed sufficient progressive collapse-resisting capacity regardless of the differences in shapes when a couple of diagrids were removed from the first story. The design parameter such as building height and the slope of the diagrids did not affect the results significantly as long as they were designed to meet the current design code.