Method of seismic reliability evaluation for moment-resisting steel frames
Eliopoulos, Dimitris F.
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Permalink
https://hdl.handle.net/2142/23218
Description
Title
Method of seismic reliability evaluation for moment-resisting steel frames
Author(s)
Eliopoulos, Dimitris F.
Issue Date
1991
Doctoral Committee Chair(s)
Wen, Y.K.
Department of Study
Civil and Environmental Engineering
Discipline
Civil and Environmental Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
A method for the evaluation of structural performance of moment resisting steel frames in future earthquakes is developed in this study. With this approach, one can evaluate the probability of failure (exceedance of a limit state) of such frames during their design lifetime.
A seismic hazard analysis is carried out in which the characteristics of ground motion at a site are identified and the uncertainties associated with source and ground motion parameters are quantified. Earthquake excitation is modeled by a nonstationary random process with time-varying amplitude and frequency content. The parameters of the model are identified from available seismological and geological information at the site where the structure is located.
A strong-column-weak-beam model is proposed in this study for moment resisting steel frames which reduces the number of degrees of freedom in the analysis and produces the response of these frames with computational efficiency and good accuracy. A random vibration analysis is performed based on the equivalent linearization method and the response statistics are evaluated for a given set of ground motion parameters. The conditional probability of failure of the frame is then derived using these statistics. A fast integration technique based on the first order reliability method is finally used to evaluate the probability of failure during the design lifetime of the structure.
The robustness of the proposed method is demonstrated in the numerical examples throughout this study. The method can be used in assessing the risk implied in current earthquake resistant design practice, and in developing reliability-based code procedures.
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