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In a general category, it is possible to divide the various irregular types of structures in height into two irregular geographic and nonlinear groups. In a geometric disorientation at elevation, the dimensions of the structure plan are significant at significant altitudes. In non-horizontal non-uniformity in height, sudden changes occur in the dynamic properties of the structure, including mass, stiffness and lateral resistance of the structure at height. Progressive breakdowns usually lead to a partial collapse of the entire structure, extending a primary damage within the structure, which is like a chain reaction. Studies on structural system failures In recent years, the importance of the phenomenon-failure phenomenon due to abnormal loading due to sudden damage, earthquake, explosion, earthquake, and so on. In this study, four steel structures with a dual-side duct frame, a special bending frame and specially designed 5, 10, 15, and 20 Story collimator brackets were designed in Etabs 2016 software. Then, using the US Department of Comprehensive Maintenance Manual and the method selection The alternative load transfer route, the well-known structures in OpenSEES software is modeled 3D and uses neonotope dynamic analysis to investigate the irregularities of the damping of the perpendicular system on the structural behavior of the seismic behavior in the progressive failure. After analyzing the results of the analysis, it was observed that the irregularity of the cutoff of the lateral load system reduced the structure and stability of the structure and reduced the structural strength against progressive failure.

Keywords: Irregularities, Progressive failures, Dual steel structures, Seismic behavior

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