Title

Thin Steel Sheet Wrapping on RC Columns and Steel Plate Strengthening on Beam-Column Joints for Seismic Ductility and Capacity Improvements

Abstract

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.

Meeting Name

100th Anniversary Earthquake Conference

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Beam-Columns; Ductility; Reinforced Concrete; Reinforcing Steels; Retrofitting; Seismic Phenomena; Sheet Metal

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2006 Earthquake Engineering Research Institute (EERI), All rights reserved.

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