A Rough Collapse Assessment of Earthquake Excited Structural Systems Vulnerable to the P-Delta Effect

Abstract eng:
This paper addresses the prediction of the seismic collapse capacity of flexible nondeteriorating multi-story frame structures with regular layout, which are vulnerable to the destabilizing effect of gravity loads. The proposed time-saving and yet sufficient accurate methodologies are based on an equivalent single-degree-of-freedom system capable to cover the significant dynamic properties of the structure, and collapse capacity spectra. For a series of generic frame structures the global collapse capacity is assessed both with the proposed methodologies and the computationally expensive Incremental Dynamic Analysis procedure. From the outcomes of both methods it can be concluded that in the initial design process the proposed methodologies are an appropriate tool to assess sufficiently accurate the collapse capacity of P-delta sensitive regular moment resisting frame structures subjected to severe earthquake excitation.

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