Applicability of Prescribed Robustness and Design Approaches to Building Classes for Disproportionate Collapse Resistance

European guidance in EN 1990 and EN 1991 provides preliminary guidance for determination of appropriate design approaches for mitigation of progressive collapse. This preliminary guidance is somewhat devoid of detail with respect to applicability and analysis. It also does not lend itself well to consensus based professional and industry approaches extant in the US. Recent updated guidelines for the US DoD incorporate prescriptive approaches as a function of Building Occupancy Category, related to similar categories in existing IBC[1] Section 1604 requirements. Additionally, recently adopted IBC changes now incorporate "tie provision" requirements for IBC Section 1604 Occupancy Category III and IV buildings that are greater than 75-ft in height. The SEI Progressive Collapse Standards and Guidance Committee is developing guidance more applicable to the US approaches, and has developed preliminary thoughts towards the eventual adoption of mitigation strategy applicability.