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Developing a framework for reliability-based seismic objective performance assessment: Implementation and application☆
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DOI：10.1016/j.engstruct.2025.119821.png)
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Abstract
En 中文
The increasing demand for safer and more resilient structures seems to have significantly impacted the design approaches and the development of new structural systems. As computational power increases, integrating probabilistic analysis into seismic design is promising, but searching for more efficient methods continues. This study outlined a practical framework to conducting the reliability-based seismic performance assessment and evaluating the fulfilment of performance objectives within the context of reliability. The proposed framework represents structural demand in a coordinate system consisting of the reliability index, intensity measure, and allowable engineering demand parameter (beta-IM-EDPall) expressed as surfaces, and provides reliability index spectra facilitating the reliability-based seismic performance assessment. The proposed framework employs sampling techniques, including Monte Carlo Simulation and Latin Hypercube Sampling, to address epistemic uncertainties, while a suite of ground motions is utilized to account for aleatory uncertainties. Seismic performances and fulfilment of objective performances were evaluated for five base-rocking walls (from low- to highrise) as case studies to demonstrate the potential of the proposed framework. The design parameters of baserocking walls were chosen as random variables (RVs), with three coefficients of variation (CoV) selected to generate possible realizations of RVs. Moreover, fifty ground motions, four hazard levels and four performance levels were selected to implement the outlined framework. The results obtained from both sampling methods reveal a similar trend in the variation of failure probabilities and the reliability index of the studied scenario. This suggests that, among the selected random variables (RVs), the height and width of the walls are the most influential parameters. Increasing the height causes the developed beta-IM-EDPall surfaces to flatten slightly, and beta spectra become steeper, indicating the higher vulnerability of taller walls. Moreover, increasing the height reduces the influence of epistemic uncertainty. Only the low- to mid-rise walls (i.e., four- to twelve-floor) with a CoV of 5 and 10 % could meet the requirements of 'Basic Objective' and 'Essential Objective'. In the context of reliability and within the scope of the analyzed scenarios, the existing design methods may not guarantee a reliable and safe design for mid- to high-rise base-rocking walls.
Keywords:
Reliability analysis
Seismic performance
Objective performance
Rocking walls
Monte Carlo Simulation
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