Fragility curves of concrete bridges retrofitted by column jacketing |
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Authors: | Masanobu Shinozuka Sang-Hoon Kim Shigeru Kushiyama Jin-Hak Yi |
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Institution: | 1. Civil & Envir. Eng. Dept., Univ. of California, Irvine, California, U.S.A. 2. Architecture Dept., Faculty ofEng., Hokkai-Gakuen University Japan |
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Abstract: | The Northridge earthquake inflicted various levels of damage upon a large number of Caltrans’ bridges not retrofitted by column
jacketing. In this respect, this study represents results of fragility curve development for two (2) sample bridges typical
in southern California, strengthened for seismic retrofit by means of steel jacketing of bridge columns. Monte Carlo simulation
is performed to study nonlinear dynamic responses of the bridges before and after column retrofit. Fragility curves in this
study are represented by lognormal distribution functions with two parameters and developed as a function of PGA. The sixty
(60) ground acceleration time histories for the Los Angeles area developed for the Federal Emergency Management Agcncy (FEMA)
SAC (SEAOC-ATC-CUREe) steel project are used for the dynamic analysis of the bridges. The improvement in the fragility with
steel jacketing is quantified by comparing fragility curves of the bridge before and after column retrofit. In this first
attempt to formulate the problem of fragility enhancement, the quantification is made by comparing the median values of the
fragility curves before and after the retrofit. Under the hypothesis that this quantification also applies to empirical fragility
curves developed on the basis of Northridge earthquake damage, the enhanced version of the empirical curves is developed for
the ensuing analysis to determine the enhancement of transportation network performance due to the retrofit.
Supported by: MCEER/FHWA under Contract No.DTFH 61-98-C-00094 and Caltrans under Contract No.59A0304 |
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Keywords: | fragility curves concrete bridges retrofit column jacketing nonlinear dynamic analysis ductility |
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