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Effectiveness of UHPFRC cover for the seismic strengthening of deficient bridge piers
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<p>The paper presents the results of an experimental and analytical research program aimed at developing an innovative seismic strengthening technique using Ultra‐high Performance Fibre Reinforced Concrete (UHPFRC) cover applied to existing bridge piers with deficient reinforcement detailing. Experimental results on full‐scale rectangular bridge pier specimens with cross‐sectional aspect ratios of 4:1 and 2:1 subjected to weak or strong axis bending showed that the exceptional mechanical properties of UHPFRC allow eliminating concrete failure modes such as splitting cracks, spalling and crushing, thereby allowing transferring lapped bar forces through the surrounding UHPFRC, as well as failure modes associated with inadequate reinforcement detailing. Refined 3D nonlinear finite element models were developed to provide a numerical tool for evaluating the performance the strengthening technique.</p>
International Association for Bridge and Structural Engineering (IABSE)
Title: Effectiveness of UHPFRC cover for the seismic strengthening of deficient bridge piers
Description:
<p>The paper presents the results of an experimental and analytical research program aimed at developing an innovative seismic strengthening technique using Ultra‐high Performance Fibre Reinforced Concrete (UHPFRC) cover applied to existing bridge piers with deficient reinforcement detailing.
Experimental results on full‐scale rectangular bridge pier specimens with cross‐sectional aspect ratios of 4:1 and 2:1 subjected to weak or strong axis bending showed that the exceptional mechanical properties of UHPFRC allow eliminating concrete failure modes such as splitting cracks, spalling and crushing, thereby allowing transferring lapped bar forces through the surrounding UHPFRC, as well as failure modes associated with inadequate reinforcement detailing.
Refined 3D nonlinear finite element models were developed to provide a numerical tool for evaluating the performance the strengthening technique.
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