Strategic slab-column joint details for improved transmission of HSC column loads

J. H. Lee, J. M. Yang, Y. S. Yoon

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In typical construction, the slab is made of normal-strength concrete (NSC) and is cast in a continuous fashion through the slab-column joint. For the case of high-strength concrete (HSC) columns, this results in a layer of lower-strength concrete between the upper and lower columns at the floor levels. Since this lower-strength concrete layer can limit the capacity of the column, it is necessary to provide alternative design or construction strategies for the transmission of column loads through slab-column connections. The current paper presents the structural characteristics of slab-column connections by using full-scale tests and non-linear three-dimensional finite-element analyses. Finite-element analyses considering material non-linearity were performed to investigate the axial load plotted against average column strain responses, the type of failure, the principal stress distribution and the reinforcement yielding conditions for various slab-column members. The puddled HSC in the joint, the HSC core, the use of high-strength steel for the column longitudinal reinforcement, and the additional vertical compression reinforcement through the joint were investigated. The alternative reinforcement methods in the slab-column joints significantly improved the performance of the joints - that is, higher axial compressive strength, greater loading stiffness and higher ductility.

Original languageEnglish
Pages (from-to)85-91
Number of pages7
JournalMagazine of Concrete Research
Volume60
Issue number2
DOIs
Publication statusPublished - 2008 Mar 1

ASJC Scopus subject areas

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

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