Experimental Study on Bond-Strengthening Hooks for RC Beams

• Sato Yuichi

  Dept. of Urban and Environmental Engineering, Kyoto University, Kyoto, Japan.

• Nagatomo Katsuhiro

  Mitoyo-sangyo Corporation, Kagawa, Japan.

• Nakamura Yoshifumi

  Neturen Corporation, Tokyo, Japan.

Abstract

This paper presents an experimental investigation of bond-strengthening hooks as a new method to increase bond strength along flexural reinforcing bars in reinforced concrete (RC) beams. The proposed method attempts to increase confining stiffness around the flexural bars by placing U-shaped hooks and to prevent premature bond splitting failure. Ten specimens with different numbers and sizes of hooks were prepared to verify the strengthening effectiveness under monotonic four-point loading. The test results indicated that the hooks increased the bond strength along flexural bars although the strengthening effectiveness was limited by the effective number of anchors of hooks N_be. This limit is determined by the size of the stress-transmitting zones of the concrete around the anchors of the hooks. The bond-strengthening effectiveness of hooks was found to be equivalent to that of conventional internal ties.

Journal

• Journal of Advanced Concrete Technology

  Journal of Advanced Concrete Technology 7 (2), 263-271, 2009-06-30

  Japan Concrete Institute

Keywords

• General Materials Science
• Building and Construction

Details

• CRID: 1390282680196197248
• NII Article ID: 130000127194
• NII Book ID: AA11862067
• DOI: 10.3151/jact.7.263
• ISSN: 13473913
• ISSN: 13468014
• HANDLE: 2433/159440
• Web Site: https://www.jstage.jst.go.jp/article/jact/7/2/7_2_263/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed