Seismic Induced Global Collapse of Non-deteriorating Frame Structures

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Seismic Induced Global Collapse of Non-deteriorating Frame Structures

Author: Christoph Adam and Clemens J ̈ ager | Size: 784 KB | Format: PDF | Quality: Unspecified | Publisher: University of Innsbruck, Department of Civil Engineering Sciences, 6020 Innsbruck, Austria | pages: 20

Abstract In a severe seismic event the destabilizing effect of gravity loads, i.e. the P-delta effect, may be the primary trigger for global collapse of quite flexible structures exhibiting large inelastic deformations. This article deals with seismic
induced global collapse of multi-story frame structures with non-deteriorating material properties, which are vulnerable to the P-delta effect. In particular, the excitation intensity for P-delta induced structural collapse, which is referred to as collapse capacity, is evaluated. The initial assessment of the structural vulnerability to P-delta effects is based on pushover analyses. More detailed information about the collapse capacity renders Incremental Dynamic Analyses involving a set of recorded ground motions. In a simplified approach equivalent single-degree-of-freedom systems and collapse capacity spectra are utilized to predict the seismic collapse capacity of regular multi-story frame structures.

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