Thin Steel Sheet Wrapping on RC Columns and Steel Plate Strengthening on Beam-Column Joints for Seismic Ductility and Capacity Improvements
Two 4/5-scale reinforced concrete beam-column assemblages were tested under cyclic loading to study the limit states of bridge substructures and the performance of a new lightweight steel wrapping technology for the seismic retrofit of columns. The first specimen was unretrofitted and served as a benchmark. The circular column of the second specimen was wrapped with a thin steel sheet whose ends were connected with an interlocked nail joint. The bent cap/column joint of the second specimen was strengthened with a steel cage welded together from several steel plates. Test results indicated that the unretrofitted specimen failed in column shear at displacement ductility of 2.0-2.5. The repaired first specimen then failed in column longitudinal rebar pullout from the bent cap/column joint at displacement ductility of 3.0-4.0. The new retrofit technique has enabled the displacement ductility to increase to 6.0-8.0 before the column rebar was pulled out of the joint due to significant shear cracks.
X. Ying et al., "Thin Steel Sheet Wrapping on RC Columns and Steel Plate Strengthening on Beam-Column Joints for Seismic Ductility and Capacity Improvements," Proceedings of the 100th Anniversary Earthquake Conference, Earthquake Engineering Research Institute (EERI), Apr 2006.
100th Anniversary Earthquake Conference
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Beam-Columns; Ductility; Reinforced Concrete; Reinforcing Steels; Retrofitting; Seismic Phenomena; Sheet Metal
Article - Conference proceedings
© 2006 Earthquake Engineering Research Institute (EERI), All rights reserved.