Title: Rapid Seismic Repair of Severely Damaged Concrete Columns with CFRP Shell
Author(s): Ruo-Yang Wu and Chris P. Pantelides
Publication: Symposium Paper
Appears on pages(s): 9.1-9.20
Keywords: accelerate bridge construction, column, earthquake, fiber reinforced polymer composites, plastic hinge relocation, repair
A rapid repair or replacement method is developed for severely damaged concrete bridge columns due to cyclic loading. A carbon fiber-reinforced polymer (CFRP) shell and headed steel bars are used to relocate the column plastic hinge. The technique employs a steel collar with steel studs to increase bond of the original column to repair concrete inside the CFRP shell. Two bridge columns were damaged including concrete crushing and longitudinal steel bar pullout under quasi-static cyclic loads. One of the specimens required additional epoxy injection of the cracks; for the other specimen, the column and cap beam were decoupled before repair to simulate replacement of a column which sustained unrepairable damage. The technique successfully relocated the plastic hinge and restored strength and displacement capacity. Failure of the repaired specimens included concrete crushing and bar fracture. The technique is an accelerated bridge construction method and could be used to repair columns with repairable damage or replace columns with unrepairable damage.