Collapse Capacity Spectra Based on an Improved Intensity Measure

Abstract eng:
A collapse capacity spectrum represents the seismic collapse capacity of highly inelastic non-degrading single-degree-of-freedom systems vulnerable to the destabilizing effect as a function of characteristic structural parameters. In this paper collapse capacity spectra with reduced dispersion due to record-to-record uncertainties are presented. This reduction is achieved utilizing an improved intensity measure, based on the spectral acceleration averaged in a certain period band between the structural period and an elongated period. It is shown that the “optimal” elongated period, which is related to the smallest achievable dispersion, depends primarily on the structural period. Based on extensive parametric studies, an analytical expression for the optimal ratio between elongated and structural period is derived. This analytical period ratio is constant for systems with a period larger than 0.15 s. In several examples the superiority of the presented collapse capacity spectra with respect to the related dispersion is shown and quantified.

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