Seismic Responses of Regular Highway Bridges Under Near-Fault Ground Motions

Hai, Bin; Zhuo, Wei Dong; Fiorentino, Gabriele; Lavorato, Davide; Nuti, Camillo; Sun, Yongjian

doi:10.7712/120117.5554.18034

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…The repair strategy should also be tested that considers a deformation history that is representative of the bridge response in other scenarios, such as non-synchronous seismic action [71][72][73][74][75], because the distance between the pier foundations can be large; and for near-fault earthquake excitation [76,77], which produces a bridge response different to those due to synchronous far fault earthquakes. Finally, the repair strategy should also be applied to integral bridges, which present a peculiar problem in the case of severe damage [78,79].…”

Section: Discussionmentioning

confidence: 99%

Severely Damaged Reinforced Concrete Circular Columns Repaired by Turned Steel Rebar and High-Performance Concrete Jacketing with Steel or Polymer Fibers

et al. 2018

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A new strategy that repairs severely damaged reinforced concrete (RC) columns after an earthquake is proposed as a simpler and quicker solution with respect to the strategies currently available in the literature. The external concrete parts are removed from the column surface along the whole plastic hinge region to uncover the steel reinforcement. The transverse steel is cut away, and each longitudinal rebar is locally substituted by steel rebar segments connected by welding connections to the original undamaged rebar pieces outside the intervention zone. The new rebar segments have a reduced diameter achieved by turning to ensure plastic deformation only in the plastic hinge, protecting the original rebar and the welding connections. The connection is specifically designed to be effective and simple, and is directly realized on column reinforcement. Finally, the removed concrete is restored by a jacket built with high-performance concrete with steel or polymer fibers. The use of concrete with high volume fraction of polymer fibers to repair the column is investigated for the first time in this paper. This concrete was characterized by compression and flexural tests in the laboratory and its mechanical characteristics were compared with those of the concrete with steel fibers, which are being increasingly used in construction. The repair strategy was applied to two RC columns (1:6 scaled bridge piers), tested by asymmetric cyclic tests. The results show that the column strength, stiffness, and ductility were restored, and the energy dissipation capacity improved. The experimental evidence was investigated by fiber models in OpenSees.

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Section: Discussionmentioning

confidence: 99%

Severely Damaged Reinforced Concrete Circular Columns Repaired by Turned Steel Rebar and High-Performance Concrete Jacketing with Steel or Polymer Fibers

et al. 2018

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“…Further analyses are in progress to evaluate the seismic response of existing bridges repaired and retrofitted after strong seismic damage [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. The seismic behavior of bridges subjected to asynchronous excitation will be defined also considering near fault earthquake [57,58] …”

Section: Discussionmentioning

confidence: 99%

Surface Generation of Asynchronous Seismic Signals for the Seismic Response Analysis of Bridges

Lavorato¹,

Fiorentino²,

Bergami³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…The new selected cases of study will include also some existing bridges repaired and retrofitted after strong seismic damage by some new rapid techniques [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55]. The seismic behavior of bridges subjected to asynchronous excitation will be defined also considering near fault earthquake [56,57].…”

Section: Discussionmentioning

confidence: 99%

Seismic Behaviour of Isolated Rc Bridges Subjected to Asynchronous Seismic Input

Lavorato¹,

Bergami²,

Rago³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Seismic Responses of Regular Highway Bridges Under Near-Fault Ground Motions

Abstract: Abstract. Ground motions recorded in near-

Cited by 5 publications

References 13 publications

Severely Damaged Reinforced Concrete Circular Columns Repaired by Turned Steel Rebar and High-Performance Concrete Jacketing with Steel or Polymer Fibers

Severely Damaged Reinforced Concrete Circular Columns Repaired by Turned Steel Rebar and High-Performance Concrete Jacketing with Steel or Polymer Fibers

Surface Generation of Asynchronous Seismic Signals for the Seismic Response Analysis of Bridges

Seismic Behaviour of Isolated Rc Bridges Subjected to Asynchronous Seismic Input

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