Seismic resistance and mechanical behaviour of exterior beam-column joints with crossed inclined bars

P. G. Bakir*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Attempts at improving beam-column joint performance has resulted in non-conventional ways of reinforcement such as the use of the crossed inclined bars in the joint area. Despite the wide accumulation of test data, the influence of the crossed inclined bars on the shear strength of the cyclically loaded exterior beam-column joints has not yet been quantified and incorporated into code recommendations. In this study, the investigation of joints has been pursued on two different fronts. In the first approach, the parameters that influence the behaviour of the cyclically loaded beam-column joints are investigated. Several parametric studies are carried out to explore the shear resisting mechanisms of cyclically loaded beam-column joints using an experimental database consisting of a large number of joint tests. In the second approach, the mechanical behaviour of joints is investigated and the equations for the principal tensile strain and the average shear stress are derived from joint mechanics. It is apparent that the predictions of these two approaches agree well with each other. A design equation that predicts the shear strength of the cyclically loaded exterior beam-column joints is proposed. The design equation proposed has three major differences from the previously suggested design equations. First, the influence of the bond conditions on the joint shear strength is considered. Second, the equation takes the influence of the shear transfer mechanisms of the crossed inclined bars into account and, third, the equation is applicable on joints with high concrete cylinder strength. The proposed equation is compared with the predictions of the other design equations. It is apparent that the proposed design equation predicts the joint shear strength accurately and is an improvement on the existing code recommendations.

Original languageEnglish
Pages (from-to)493-517
Number of pages25
JournalStructural Engineering and Mechanics
Volume16
Issue number4
DOIs
Publication statusPublished - Oct 2003

Keywords

  • Anchorage
  • Beams
  • Bond (concrete to reinforcement)
  • Columns
  • Connections
  • Crossed inclined bars
  • Cyclic loads
  • Deformation
  • Earthquake resistant structures
  • Joints
  • Mechanical behaviour
  • Reinforced concrete
  • Shear properties
  • Shear strength
  • Structural analysis
  • Strut and tie models

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