Seismic Shear Strengthening Method for Existing R/C Short Columns

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Title: Seismic Shear Strengthening Method for Existing R/C Short Columns

Author(s): K. Yoshimura, K. Kikcuri, and M. Kuroki

Publication: Special Publication

Volume: 128

Issue:

Appears on pages(s): 1065-1080

Keywords: earthquake-resistant structures; plates (structural members); reinforced concrete; reinforcing steels; repair; shear strength; tests; short columns; Structural Research

Date: 11/1/1991

Abstract:
There are quite a large number of existing reinforced concrete (RC) short columns which are expected to fail in brittle shear failure mode during severe earthquakes. To develop an effective seismic shear strengthening method for improving the earthquake behavior of these reinforced concrete short columns, experimental studies are conducted by using six different 1/3-scale beam-column subassemblage specimens with a short column. Three short columns of these specimens are strengthened by steel plates, while another three are without any steel plate strengthening. All the specimens are tested under a constant gravity load and alternately repeated lateral forces. Test results demonstrate that, if the short column is strengthened by a welded steel square tube, then brittle shear failure does not occur and the column can develop its ultimate flexural moment capacity. It is also shown by additional tests that the proposed strengthening method using steel plates is applicable to repair and rehabilitate the damaged short columns that failed in the brittle shear mode. Finally, an application example of the proposed strengthening method to the actual existing short columns is presented.