Seismic Reliability Assessment of Classical Columns Subjected To Near Source Ground Motions

Abstract eng:
A methodology for the performance-based seismic risk assessment of classical columns is presented. Classical columns are articulated structures, made of several discrete bulgy stone blocks (drums) put one on top of the other without mortar. Despite its apparent instability, this structural system is, in general, earthquake resistant, as proven from the fact that many classical monuments have survived many strong earthquakes over the centuries. Nevertheless, due to the fundamental non-linear character and the sensitivity of their response, the quantitative assessment of their reliability and the understanding of their dynamic behaviour are not easy. Consequently, the derivation of general remarks regarding their seismic risk is not trivial. In order to understand the dynamic behaviour and estimate the capacity of multidrum columns, a seismic risk assessment methodology is performed using Monte Carlo simulation with synthetic ground motions. The ground motions adopted contain a high and a low frequency component, combining the stochastic method and a simple analytical pulse model in order to simulate the directivity pulse contained in near source ground motions. Fragility curves are produced first conditional on magnitude and fault distance and then using a scalar intensity measure. The deterministic model for the numerical analysis of the system is three dimensional and is based on the Discrete Element Method (3D DEM). Fragility analysis demonstrates some of the salient features of these spinal systems and provides useful results regarding their reliability and decision-making during restoration process.

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