Prediction of structural response using different seismic intensity measures: Sa(T1) vs INp
DOI:
https://doi.org/10.37636/recit.v9n3e451Keywords:
Intensity measures, Spectral shape parameter Np, Seismic response, Reinforced concrete buildings, Incremental dynamic analysisAbstract
This research evaluates the efficiency of the scalar intensity measure INp compared to the traditional Sa(T1) for predicting structural response. The scientific novelty of the study lies in demonstrating how Sa(T1) severely overestimates damage in the inelastic range by ignoring the elongation of the structure's period, and how the INp measure corrects this limitation. Three models of eight-story reinforced concrete frames with low, medium, and high ductility were designed. These models were subjected to Incremental Dynamic Analysis (ADI) using soft soil seismic records and the Takeda hysteretic model to measure the Maximum Interstory Distortion (MID). The results confirm that INp significantly reduces dispersion and uncertainty. When evaluating the design limit distortion, INp achieved a decrease in the standard deviation of 7.24% in the low-ductility model, 36.58% in the medium-ductility model, and 30.51% in the high-ductility model. In conclusion, incorporating the spectral shape using INp avoids overestimation of Sa(T1) damage and offers much more reliable predictions for structural design.
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Data Availability Statement
The datasets generated during the study are available from the corresponding author upon request
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Copyright (c) 2026 Jesús Prisicliano Romo Villa, Edén Bojórquez Mora, Jesús David Tirado Ibarría, Juan Bojórquez Mora, Sonia Elda Ruiz Gómez
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