Ground Motion Intensity Measures for Probabilistic Seismic Analysis of the RC High-Rise Buildings

Abstract eng:
The construction of high-rise buildings in seismically active areas has become an everyday design trend, which is mainly due to growing urbanisation, rapid growth of cities, and concentration of material resources in urban environments. A similar trend is also emerging in the South-European Mediterranean zone. As the entire Mediterranean belt is a seismically active area, detailed seismic analyses have to be undertaken for this category of buildings. This paper is a part of an extensive research work focusing on the probabilistic seismic analysis and estimation of vulnerability of RC high-rise buildings to seismic excitation typical for the South-European Mediterranean zone. The theme of this paper is the analysis of relationship between the ground motion intensity measure, IM, and the seismic response parameter, EDP, in order to identify and define the most efficient EDP-IM dependencies for RC high-rise buildings that could also be useful in practical terms. The EDP-IM dependency is efficient if it provides the lowest dissipation of EDP results for given IM values. The EDP-IM dependence is practical if the relationship can be established through intensity measures that enable a clear physical interpretation, and that can easily be calculated from seismic records and seismic responses from the non-linear time-history analysis. As a prototype buildings, 20-story, 30-story and 40-story RC high-rise buildings with core wall structural system were selected. The analysis and design of the prototype RC buildings were conducted according to the Eurocode 2 and Eurocode 8. In order to determine the most efficient EDP-IM model, 720 nonlinear time-history analyses were conducted for 60 ground motion records with a wide range of magnitudes and distances to source, and for various soil types, thus taking into account uncertainties during ground motion selection. Ground motion selection was done within the South-European Mediterranean seismic zone. Due to the lack of ground motions in the Southern Euro-Meditteranean zone, which may be selected without being previously scaled and with mean spectrum to be in accordance with Eurocode spectrum, it was necessary to scale the ground motions. The mean squared error method (MSE) was chosen as a mode of scaling of ground motions. For the purpose of conducting nonlinear time-history analyses, non-linear 3D models of the buildings were designed using the PERFORM-3D software. A detailed analysis and statistical processing of results were performed, and appropriate EDP-IM relationships were derived. Analyzing a large number of results it were adopted conclusions on the efficiency of individual ground motion intensity measures for the case of RC high-rise building.

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