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Seismic fragility analysis of concrete bridge piers reinforced by steel fibers

Seismic fragility analysis of concrete bridge piers reinforced by steel fibers Seismic fragility analyses of eight bridge piers, made of steel fiber–reinforced concrete or conventional reinforced concrete, were conducted to reasonably analyze the seismic performance of concrete piers reinforced by steel fibers. The pier specimens were constructed with different steel fiber contents, stirrup ratios, and lengths of the steel fiber–reinforced concrete region. The cyclic load tests on the specimens were carried out to obtain the characteristic values of structural capacity for five damage states. The nonlinear time history analyses of the piers under a suite of selected ground motions were performed to obtain the probabilistic characteristics of structural demand. Using the data related to structural capacity and seismic demand, the fragility curves of these piers were constructed based on an assumed lognormal distribution. The fragility results indicate that (1) the seismic vulnerability of the concrete piers is reduced with the increase in steel fiber content in a certain range, (2) the reinforced concrete pier with a higher stirrup ratio is found to be more vulnerable than the steel fiber–reinforced concrete pier with a relatively lower stirrup ratio, and (3) the fragility of piers adopting steel fiber–reinforced concrete locally and suitably is similar to that of the piers adopting steel fiber–reinforced concrete wholly. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advances in Structural Engineering SAGE

Seismic fragility analysis of concrete bridge piers reinforced by steel fibers

Advances in Structural Engineering , Volume 19 (5): 12 – May 1, 2016

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References (30)

Publisher
SAGE
Copyright
© The Author(s) 2016
ISSN
1369-4332
eISSN
2048-4011
DOI
10.1177/1369433216630440
Publisher site
See Article on Publisher Site

Abstract

Seismic fragility analyses of eight bridge piers, made of steel fiber–reinforced concrete or conventional reinforced concrete, were conducted to reasonably analyze the seismic performance of concrete piers reinforced by steel fibers. The pier specimens were constructed with different steel fiber contents, stirrup ratios, and lengths of the steel fiber–reinforced concrete region. The cyclic load tests on the specimens were carried out to obtain the characteristic values of structural capacity for five damage states. The nonlinear time history analyses of the piers under a suite of selected ground motions were performed to obtain the probabilistic characteristics of structural demand. Using the data related to structural capacity and seismic demand, the fragility curves of these piers were constructed based on an assumed lognormal distribution. The fragility results indicate that (1) the seismic vulnerability of the concrete piers is reduced with the increase in steel fiber content in a certain range, (2) the reinforced concrete pier with a higher stirrup ratio is found to be more vulnerable than the steel fiber–reinforced concrete pier with a relatively lower stirrup ratio, and (3) the fragility of piers adopting steel fiber–reinforced concrete locally and suitably is similar to that of the piers adopting steel fiber–reinforced concrete wholly.

Journal

Advances in Structural EngineeringSAGE

Published: May 1, 2016

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