Influence of site-specific strong-motion duration on structural performance.
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| Title: | Influence of site-specific strong-motion duration on structural performance. |
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| Authors: | López-Castañeda, Alhelí S.1 (AUTHOR) ALopezCa@iingen.unam.mx, Reinoso, Eduardo1 (AUTHOR), Martín del Campo, J. Osvaldo2 (AUTHOR) |
| Source: | Bulletin of Earthquake Engineering. Oct2022, Vol. 20 Issue 13, p7047-7075. 29p. |
| Subject Terms: | *Accelerograms, *Seismic response, *Subduction zones, *Systems engineering, *Steel framing, *Tsunamis, *Earthquake hazard analysis |
| Geographic Terms: | Mexico City (Mexico) |
| Abstract: | This study evaluates the influence of site-specific strong-motion duration caused by interplate earthquakes on structural performance. Specifically, the seismic response of an equivalent single-degree-of-freedom (SDOF) system subjected to a set of accelerograms recorded at different soil-profile sites located in Mexico City is analyzed. The properties of the equivalent SDOF system were estimated from the dynamic characteristics and pushover curve of a steel frame. The accelerograms, whose total durations, t r , vary from approximately 120 s to 350 s, are associated with earthquakes that occurred in the Mexican subduction zone. In addition, several synthetic accelerograms were generated to evaluate the seismic performance of the equivalent SDOF system via fragility curves. Operational, life safety, and collapse performance levels were assessed. In particular, two approaches were considered for the evaluation of the effects of the strong-motion duration on the performance of the equivalent SDOF system. The first approach uses the peak displacement of the system as the engineering demand parameter (EDP), whereas the second approach uses an energy-based damage index. Results indicate that the strong-motion duration has a significant influence on the nonlinear response of the equivalent SDOF system when considering any of the mentioned EDPs. Overall, the greater differences in fragility are seen for sites that show the greatest response-spectrum amplitudes in the range of dominant periods, T s , near the fundamental period of the equivalent SDOF system. This study demonstrates the importance of properly characterizing the strong-motion duration when selecting site-specific accelerograms to perform nonlinear dynamic analyses. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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