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Consideration of aging and SSI effects on seismic vulnerability assessment of RC buildings

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Abstract

At present, the seismic vulnerability assessment of reinforced concrete (RC) buildings is made considering fixed base conditions; moreover, the mechanical properties of the building remain intact in time. In this study we investigate whether these two fundamental hypotheses are sound as aging and soil-structure interaction (SSI) effects might play a crucial role in the seismic fragility analysis of RC structures. Among the various aging processes, we consider the chloride-induced corrosion based on probabilistic modeling of corrosion initiation time and corrosion rate. Different corrosion aspects are considered in the analysis including the loss of reinforcement cross-sectional area, the degradation of concrete cover and the reduction of steel ultimate deformation. SSI is modeled by applying the direct one-step approach, which accounts simultaneously for inertial and kinematic interactions. Two-dimensional incremental dynamic analysis is performed to assess the seismic performance of the initial uncorroded (\(\hbox {t}=0\) years) and corroded (\(\hbox {t}=50\) years) RC moment resisting frame structures, having been designed with different seismic code levels. The time-dependent fragility functions are derived in terms of the spectral acceleration at the fundamental mode of the structure \(\hbox {S}_{\mathrm{a}}(\hbox {T}_{1}\), 5 %) and the outcropping peak ground acceleration for the immediate occupancy and collapse prevention limit states. Results show an overall increase in seismic vulnerability over time due to corrosion highlighting the important influence of deterioration due to aging effects on the structural behavior. Moreover, the consideration of SSI and site effects may significantly alter the expected structural performance leading to higher vulnerability values.

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Acknowledgments

The work reported in this paper was carried out in the framework of the ongoing REAKT (http://www.reaktproject.eu/) project, funded by the European Commission, FP7-282862.

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  1. Department of Civil Engineering, Research Unit of Geotechnical Earthquake Engineering and Soil Dynamics, Aristotle University, Thessaloníki, Greece

    K. D. Pitilakis, S. T. Karapetrou & S. D. Fotopoulou

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  1. K. D. Pitilakis
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  2. S. T. Karapetrou
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  3. S. D. Fotopoulou
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Correspondence to S. T. Karapetrou.

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Pitilakis, K.D., Karapetrou, S.T. & Fotopoulou, S.D. Consideration of aging and SSI effects on seismic vulnerability assessment of RC buildings. Bull Earthquake Eng 12, 1755–1776 (2014). https://doi.org/10.1007/s10518-013-9575-8

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