Seismic Fragility Assessment for Reinforced Concrete High -Rise Buildings
Ji, Jun
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Permalink
https://hdl.handle.net/2142/83325
Description
Title
Seismic Fragility Assessment for Reinforced Concrete High -Rise Buildings
Author(s)
Ji, Jun
Issue Date
2007
Doctoral Committee Chair(s)
Elnashai, Amr S.
Kuchma, Daniel A.
Department of Study
Civil Engineering
Discipline
Civil 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 complete methodology is proposed and demonstrated, containing the key steps of the methodology and the illustration through an example of the fragility assessment of an existing 54-storey building with a dual core wall system. The set of rigorously derived probabilistic fragilities are the first published for high-rise RC buildings, thus they fill an important void in regional earthquake impact assessment in Metropolitan communities. The inelastic dynamic analyses for the fragility assessments are undertaken using a simplified lumped-parameter model that was derived from highly detailed FE models using genetic algorithms. New definitions for performance limit states are based on the results of detailed pushover analyses of a multi-resolution distributed finite element model that includes shear-flexure-axial interaction effects. To develop the fragility relationships, more than two thousand dynamic response history analyses were conducted. This study considered uncertainty in structural material values as well as in seismic demand. Thirty natural and twenty artificial strong motion records were selected for the analyses that would produce an appropriate range in structural response parameters due to variation in magnitude, distance and site condition. The overall approach is generic and can be applied to develop computationally efficient and probabilistically based seismic fragility relationships for RC high-rise buildings of different configurations.
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