An efficient seismic intensity measure for seismic risk analysis of structures

Date

2010-12-01

Author

Çelik, Ozan Cem

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In a seismic fragility or seismic margins assessment, the estimated structural system response is conditioned on a measure of seismic intensity. The U.S. Geological Survey currently stipulates the site-dependent seismic hazard by mapping the spectral acceleration at a frequency of 2% probability of being exceeded in 50 years. The scatter in structural responses at a given intensity measure (IM) due to record-to-record variability in ground motion ensembles used in nonlinear time history analysis of structures provides a relative measure of the efficiency of an IM. A number of investigators have noted recently that the spectral acceleration, while an improvement over the ground motion-based IMs, is still relatively inefficient when the structure responds nonlinearly and softens during earthquake ground motion. This issue is addressed in this paper with the use of a previously proposed IM that accounts for period softening of the structure. The parameters of this IM are optimized to minimize the uncertainty in probabilistic seismic demand models for typical three-, six-, and nine-story reinforced concrete frames in the Central and Eastern U.S. Ensembles of synthetic earthquake ground motions that were developed specifically for the New Madrid Seismic Zone are used in finite-element based nonlinear dynamic time history analyses. Seismic fragilities that are subsequently derived for the three concrete frames are compared with those previously developed using the spectral acceleration as an IM, and their implications for seismic risk assessment are discussed.

Subject Keywords

Civil engineering, Engineering geology, Photomapping, Reinforced concrete, Risk assessment, Seismic design, Tsunamis, Uncertainty analysis

URI

https://hdl.handle.net/11511/78106

Conference Name

9th US National and 10th Canadian Conference on Earthquake Engineering 2010, Including Papers from the 4th International Tsunami Symposium, (25 July 2010 through 29 July 2010)

Collections

Department of Civil Engineering, Conference / Seminar

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Citation Formats

O. C. Çelik, “An efficient seismic intensity measure for seismic risk analysis of structures,” Toronto, ON; Canada, 2010, vol. 3, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/78106.