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Inelastic displacement demand of RC buildings subjected to earthquakes generated by intermediate-depth Vrancea seismic source

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Abstract

Evaluating inelastic displacement demand of structures exposed to seismic hazard is required for the design of new buildings as well as for seismic risk assessment of existing structures. Most of the buildings are designed to withstand strong earthquakes by responding in the nonlinear range. Having special parts of the structure designed to develop a stable hysteretic behaviour allows the structure to deform in order to accommodate the displacement demand imposed by strong ground motions. This paper is centred on finding a correspondence between the maximum elastic and inelastic displacement responses of the single degree of freedom (SDOF) systems subjected to earthquakes generated by Vrancea seismic source. Vrancea intermediate-depth earthquakes are responsible for the seismic hazard throughout Romanian territory. They have distinctive features, such as large displacement demand and large predominant periods, which makes Romania a special seismic environment. Using a database of Romanian and Japanese strong ground motions generated by intermediate-depth earthquakes and performing nonlinear dynamic analysis on the SDOF oscillators following the Takeda model, this study estimates the inelastic to elastic displacement ratio of reinforced concrete systems. Soil conditions, epicentral distance and magnitude influence on inelastic response is analysed using constant ductility response spectra. The main findings of the study are: the local increase of the inelastic to elastic displacement ratio for type C soil (Eurocode 8 classification) for large magnitude earthquakes and the significant effect of soil conditions on the inelastic response of the SDOF systems. The inelastic amplification was evaluated using a functional form depending on system ductility, soil conditions and earthquake magnitude.

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The data presented in this study are available on request from the corresponding author.

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Acknowledgements

The authors would like to thank National Research Institute for Earth Science and Disaster Resilience (NIED, http://www.kyoshin.bosai.go.jp/) for providing access to K-NET and Kik-net ground motion record databases. The support of Mr. Florin Pavel throughout the development of this study is greatly acknowledged. The authors would like to express their gratitude for the constructive comments received from two anonymous reviewers who helped to improve considerably the quality of this article.

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  1. Department of Reinforced Concrete Structures, Technical University of Civil Engineering Bucharest, 020396, Bucureşti, Romania

    Paul Olteanu & Radu Vacareanu

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  1. Paul Olteanu
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  2. Radu Vacareanu
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Correspondence to Paul Olteanu.

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Olteanu, P., Vacareanu, R. Inelastic displacement demand of RC buildings subjected to earthquakes generated by intermediate-depth Vrancea seismic source. Nat Hazards 109, 2509–2534 (2021). https://doi.org/10.1007/s11069-021-04930-3

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