Regulatory Requirements For The Design Of Building Structures For Progressive Collapse

Abstract

The need to calculate building structures for the progressive collapse is reflected in a number of codes and standards of the Russian Federation and often plays a crucial role when designing building objects. As the experience in real design shows this complex problem cannot be solved by universal methods, its formulation and solution should be reflected in the sets of standards and recommendations for designing specific buildings and structures. The analysis of the foreign norms reveals that the most similar to Russian standards is EN 1991-1-7: 2006, which proposed a developed and integral system of approaches to ensure the reliability of the structures of buildings and structures with different responsibility levels under special impacts (accidental actions), including the definition of strategies for protection of structures against progressive collapse. The article deals with the normative documents in the field of calculations for progressive collapse, established discrepancies and comments that need to be addressed. The new SP 385.1325800.2018 "Protection of buildings and structures against progressive collapse. Design rules. Fundamentals” has positive innovations, for example, more detailed approaches to the structural requirements when designing reinforced concrete and panel buildings. However, in some cases, this set of rules contradicts the requirements of existing regulations. Thus, the introduction of a new set of rules not only does not resolve the existing shortcomings and contradictions in the regulatory framework in the field of accounting for the progressive collapse, but only further confuses the situation.