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Fragility Curves for Concrete Bridges Retrofitted by Column Jacketing and Restrainers
The Northridge earthquake inflicted various levels of damage upon a large number of Caltrans' bridges not retrofitted. 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 and restrainers at expansion joints. Monte Carlo simulation is performed to study nonlinear dynamic responses of the bridges before and after 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 Agency (FEMA) SAC (SEAOC-ATC-CUREe) steel project are used for the dynamic analysis of the bridges. The improvement in the fragility with retrofit is quantified by comparing fragility curves of the bridge before and after 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.
Fragility Curves for Concrete Bridges Retrofitted by Column Jacketing and Restrainers
The Northridge earthquake inflicted various levels of damage upon a large number of Caltrans' bridges not retrofitted. 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 and restrainers at expansion joints. Monte Carlo simulation is performed to study nonlinear dynamic responses of the bridges before and after 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 Agency (FEMA) SAC (SEAOC-ATC-CUREe) steel project are used for the dynamic analysis of the bridges. The improvement in the fragility with retrofit is quantified by comparing fragility curves of the bridge before and after 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.
Fragility Curves for Concrete Bridges Retrofitted by Column Jacketing and Restrainers
Kim, Sang-Hoon (author) / Shinozuka, Masanobu (author)
Sixth U.S. Conference and Workshop on Lifeline Earthquake Engineering (TCLEE) 2003 ; 2003 ; Long Beach, California, United States
2003-07-24
Conference paper
Electronic Resource
English
Fragility Curves for Concrete Bridges Retrofitted by Column Jacketing and Restrainers
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