Rapid Repair of Earthquake-Damaged RC Columns with Prestressed Steel Jackets

Abstract

In this study, a lightweight prestressed steel jacket (PSJ) was proposed and developed for rapid and cost-effective repair of a severely damaged circular reinforced concrete column. The PSJ is composed of several prestressed strands, and a thin steel sheet is restrained by these strands, which can be manually wrapped around and jointed to form a jacket on the column as part of a 12-h repair job by two workers. The prestressed strands restrain the thin sheet from buckling, while the steel sheet in turn prevents the strands from cutting into cracked concrete and thus preserves the prestressing forces. The PSJ was validated with cyclic (reversed) testing of two large-scale columns with lap-splice deficiency under incrementally increased displacements every three cycles. The ultimate strength and displacement ductility of the damaged column were restored to 115% and 140%, respectively, of those of the as-built column. The initial stiffness of the damaged column, however, was restored to only 84% of that of the as-built column because the PSJ was designed to restore the strength and ductility only. By connecting the damaged column to its footing through anchored dowel bars, the levels of restoration in ultimate strength, initial stiffness, and displacement ductility were all increased by at least 20%.

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Earthquakes; RC Column Repair; Seismic Design; Concretes; Cost Effectiveness; Ductility; Geophysics; Reinforced Concrete; Repair; Restoration; Steel Sheet; Stiffness; Displacement Ductility; Initial Stiffness; Prestressed Steel Jackets; Prestressing Forces

International Standard Serial Number (ISSN)

1084-0702

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2016 American Society of Civil Engineers (ASCE), All rights reserved.

Publication Date

01 Apr 2016

Link to Full Text

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