Shear capacity evaluation of unbonded precast prestressed concrete beam-column joints caused volume loss by sheath tubes

Yuji Tajima, Shinji Kishida

Research output: Contribution to journalConference articlepeer-review


Openings in joint panel were formed by sheath tubes in unbonded precast prestressed concrete (called as PCaP/C) structure. It was expected that beam-column joint shear strength was decreased by volume loss caused by openings within joint panel. The purpose of this study is to reveal the influence of volume loss caused by sheath tubes in joint panel for PCaP/C structure and to propose the simple method to calculate reduction coefficient (called as cr). The specimens were previously tested in references. The volume loss rate (called as Rvl) caused by openings within joint panel was the percentage of a volume of sheath tubes in joint-panel divided by an effective joint-panel volume. As the Rvl increased, beam-column joint shear strength decreased gradually. When Rvl was smaller than 8.0%, the joint-panel area expanded both to the lateral and vertical direction after the peak. Particularly when the Rvl was greater than 8.0%, the jointpanel area expanded only to the lateral direction after the peak. This meant that joint panel was failed in a shear force not to horizontal direction but rather to vertical direction. Proposed reduction coefficient was multiplied by design strength of R/C beam-column joints calculated according to seismic design provisions by Architectural Institute of Japan (called as AIJ). Due to this coefficient, the reduction of joint shear strength could be taken into consideration.

Original languageEnglish
Pages (from-to)2207-2216
Number of pages10
Journalfib Symposium
Publication statusPublished - 2018
EventInternational fib Congress on Better, Smarter, Stronger, 2018 - Melbourne, Australia
Duration: 2018 Oct 72018 Oct 11


  • Joint Shear Behavior
  • Joint Shear Strength
  • Sheath Tubes
  • Unbonded Prestressed Concrete
  • Volume Loss Rate

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science (miscellaneous)


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