Seismic Retrofit for R/C Rectangular Columns by Circular Steel Jackets

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Title: Seismic Retrofit for R/C Rectangular Columns by Circular Steel Jackets

Author(s): J.H. Wang, K. Yoshimura, K. Kikuchi, and M. Kuroki

Publication: Special Publication

Volume: 238

Issue:

Appears on pages(s): 305-326

Keywords: circular steel jackets; high axial compression; RC moment-resisting frames; rectangular columns; seismic strength

Date: 10/1/2006

Abstract:
In order to investigate the seismic behavior of existing reinforced concrete (R/C) rectangular columns which are strengthened by circular steel jackets, a total of twenty column specimens with and without strengthening were designed, constructed, and were tested under three different constant axial-stresses of 5.6, 13.2 and 19.4 MPa, and alternately repeated lateral forces. Test results of retrofitted columns with circular steel jackets are compared with those obtained from the column specimens with and without rectangular steel- and CF sheet-jackets, and circular CF sheet jackets. One of the main conclusions is that the ultimate flexural strengths and deformation capacity of the R/C rectangular columns which are confined laterally by the circular steel- and CF sheet-jacketing are quite effective, especially in case of the columns under high axial-compression.