Abstract
Recent seismic design approaches developed under the umbrella of performance-based earthquake engineering (PBEE) pursue pre-defined performance objectives in terms of structural response, economic losses, or casualties. The earlier PBEE methods were mainly concerned with the deterministic evaluation of performance at a single ground motion intensity level. This premise, however, provides little insight into the long-term risk-based performance of a structure, and limits the ability to make informed design decisions. Given the inherent sources of uncertainty in all aspects of seismic design, probability theory needs to be employed to enable reliable design solutions. However, applying a risk-oriented design approach is not currently feasible for most practitioners, making it essential to understand how the current deterministic applications of these intensity-based PBEE approaches perform in terms of risk. Specifically, the aim is to investigate the capability of the direct displacement-based design (DDBD) method in producing reliable, risk-consistent designs. A probabilistic PBEE assessment framework is applied as the benchmark to determine the risk of exceeding performance objectives for multiple DDBD-based reinforced-concrete-wall and dual reinforced-concrete-wall/steel-frame buildings located at three different sites. The significant variation in the achieved risk estimates related to the limit states of damage limitation, life safety and global collapse for the buildings considered, questions the ability of DDBD—or any other intensity-based design method that does not account for uncertainty—to offer risk consistency.
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The analysis results and building models are available upon reasonable request.
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The code used for record selection is available upon reasonable request.
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Acknowledgements
The first author acknowledges the support and funding from The University School for Advanced Studies IUSS Pavia. Financial support has also been provided by the European Commission through the Horizon 2020 programs “HYPERION–Development of a decision support system for improved resilience & sustainable reconstruction of historic areas to cope with climate change & extreme events based on novel sensors and modelling tools”, Grant Agreement No. 821054, and “YADES—Improved Resilience and Sustainable Reconstruction of Cultural Heritage Areas to cope with Climate Change and Other Hazards based on Innovative Algorithms and Modelling Tools”, Grant Agreement No. 872931.
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Financial support was received from The University School for Advanced Studies IUSS Pavia. Further financial support was received from the European Commission through the Horizon 2020 programs: Grant Agreement No. 872931.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Luke van der Burg and Dr. Mohsen Kohrangi. The first draft of the manuscript was written by Luke van der Burg and Dr. Mohsen Kohrangi and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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van der Burg, L., Kohrangi, M., Vamvatsikos, D. et al. A risk-based evaluation of direct displacement-based design. Bull Earthquake Eng 20, 6611–6633 (2022). https://doi.org/10.1007/s10518-022-01447-3
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DOI: https://doi.org/10.1007/s10518-022-01447-3