PSI - Issue 78

Alvaro Lopez et al. / Procedia Structural Integrity 78 (2026) 807–814

814

• Altered Energy Dissipation Behavior: Whereas all walls developed stable flexural hysteresis, the long duration test produced fuller loops with delayed strength degradation up to moderate ductilities. This suggests that extended shaking can temporarily enhance energy dissipation before fatigue-induced deterioration sets in. • Implications for Seismic Design and Assessment: Integrating duration-sensitive loading sequences in experimental campaigns — and, by extension, into seismic design provisions — will improve the prediction of damage states and drift demands in RC shear walls, particularly for regions susceptible to long-duration subduction events. • Recommendations for Future Research: Further investigations should incorporate axial load variations to simulate overturning effects, explore a broader range of wall geometries and detailing practices, and validate advanced numerical models against these duration-informed test results to refine code provisions. Acknowledgements This paper is based upon research funded by the National Agency for Research and Development (ANID), FONDECYT Grant #11241507 whose support is gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this article are those of the authors and do not necessarily reflect the views of the sponsor. References Bazaez, R., & Dusicka, P. (2016). Cyclic Loading for RC Bridge Columns Considering Subduction Megathrust Earthquakes. Journal of Bridge Engineering , 21 (5). Chandramohan, R., Baker, J. W., & Deierlein, G. G. (2016). Quantifying the influence of ground motion duration on structural collapse capacity using spectrally equivalent records. Earthquake Spectra , 32 (2), 927 – 950. Chandramohan, R., Lin, T., Baker, J. W., & Deierlein, G. G. (2013). Influence of Ground Motion Spectral Shape and Duration. 10th International Conference on Urban Earthquake Engineering . FEMA P695. (2009). 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