Denis Mitchell

Professor, PhD Candidate, Department of Civil Engineering and Applied Mechanics, McGill University, Canada


Experiments on seismic retrofit and repair of reinforced concrete shear walls - CICE 2012

The reversed cyclic loading responses of full-scale shear wall specimens were investigated. The walls were designed and detailed to simulate non-ductile reinforced concrete construction of the 1960’s, having lap splices of the longitudinal reinforcement in the potential plastic hinge region, and having inadequate confinement of the boundary regions. The walls were tested under reversed cyclic loading with loading applied near the tip of the walls. The response of the original walls was associated with the brittle failure of the lap splice. The effectiveness of a retrofit technique and a repair technique were investigated. The retrofit involved the use of carbon fibre-reinforced polymer (CFRP) wrap for improving the lap splice behaviour and the shear strength of the walls. The repair of the previously tested specimens using a steel fibre-reinforced self consolidating concrete (SFRSCC) jacket, and CFRP wrap was investigated. The retrofit and repair techniques improved the displacement ductility, and prevented premature failure of the lap splices.