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Seismic assessment of structures with mass and stiffness irregularities under multiple earthquakes

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Abstract

Multiple earthquakes are reported in many locations around the world, recently on February 6, 2023, in Türkiye two earthquakes of magnitude 7.7 and 7.6 struck with a time interval of approximately 9 h resulted in huge destruction and collapse of structures. The lesser time interval between seismic events leads to the collapse of the structures which were damaged by the first earthquake. Most of the seismic codes do not consider the influence of multiple earthquakes, which makes the structures vulnerable to multiple earthquake phenomena. Bidirectional Incremental Dynamic Analysis (IDA) is performed on regular (S1R) and irregular (S2I) structures that are considered to access the effects of single and multiple earthquakes. The response of the structures is accessed in terms of roof displacement, storey drift ratio, IDA curves, and fragility curves generated for the suite of eleven ground motions. Results obtained from the bidirectional IDA analysis showed the effect of multiple earthquakes is significant and also the irregular structures are of greater risk under multiple earthquakes. It is noticed that from fragility curves in comparison with regular structures irregular structures are 11.11% and 27.78% more susceptible to multiple earthquakes along X and Y-direction. For S1R and S2I when subjected to multiple earthquakes, the average increase in maximum drift ratio is 29.30% and 36.44% along the X-direction, and for multiple earthquakes along the Y-direction, it is 36.42% and 40.34%. It is preferable to avoid adding irregularity into constructed structures, incorporating multiple earthquake occurrences into modern seismic regulations is advantageous.

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Acknowledgements

The Ministry of Education of India and the National Technology Institute of Raipur in India provided essential assistance to the authors to perform their research.

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The authors declare that they received no outside financial support to carry out the research.

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Authors and Affiliations

  1. Department of Civil Engineering, National Institute of Technology Raipur, Raipur, Chhattisgarh, 492010, India

    Pavan Kumar Thippa, R. K. Tripathi & Govardhan Bhat

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  1. Pavan Kumar Thippa
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Contributions

Each author has contributed to the current study at every level of the writing process. The data collection, analysis, and paper preparation were performed by Pavan Kumar Thippa. The direction and resources required for the investigation are provided by Dr. R K Tripathi and Dr. Govardhan Bhat. All authors have given their consent to the final version of the manuscript.

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Correspondence to Pavan Kumar Thippa.

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According to the writers, the data generated and assessed for the current research investigation are published in the article. The corresponding author will deliver the study’s raw data upon reasonable request.

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Thippa, P.K., Tripathi, R.K. & Bhat, G. Seismic assessment of structures with mass and stiffness irregularities under multiple earthquakes. J Build Rehabil 9, 46 (2024). https://doi.org/10.1007/s41024-024-00398-3

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  • DOI: https://doi.org/10.1007/s41024-024-00398-3

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