Performance of UHPFRC jackets for the seismic strengthening of bridge piers

Author(s): B. Massicotte, M-A. Dagenais, F. Lagier
Paper category: Symposium
Book title: RILEM-fib-AFGC International Symposium on Ultra-High Performance Fibre-Reinforced Concrete
Editor(s): F. Toutlemonde, J. Resplendino
Print ISBN: 978-2-35158-130-8
e-ISBN: 978-2-35158-131-5
Publisher: RILEM Publications S.A.R.L
Pages: 89 - 98
Total Pages: 10
Language: English

Abstract: 
The paper presents the results of an experimental program aimed at developing an innovative seismic strengthening technique using UHPFRC jackets to eliminate splitting failure mode in splice regions with deficient reinforcement details. The testing program included direct tensile tests on lapped bars, monotonic and cyclic tests on beams, and cyclic tests on four large-scale rectangular bridge piers with cross-sectional aspect ratios of 2:1.

The bridge pier cyclic test results led to the following conclusions for unconfined 24 db long lap splices: 1) UHPFRC jackets allow eliminating the splitting failure mode; 2) drift ductility ratio up to 8 were obtained without any strength reduction for bars up to 45 mm in diameter; 3) longitudinal bar buckling failure mode was eliminated for 300 mm stirrup spacing. The results of the project also suggest that this technique could be applied at other locations where reinforcement details are inadequate. The technique allows keeping the column initial dimension and can also be used for any column shape.

Online publication: 2014
Publication Type: full_text
Public price (Euros): 0.00