A new fib Model Code proposal for a beam-end type bond test

Giovanni Metelli, John Cairns, Giovanni Plizzari*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
52 Downloads (Pure)

Abstract

A beam-end test is proposed in this paper and in the new fib Model Code 2020 to determine the effects of concrete type, confinement effects, and casting position on the anchorage strength of reinforcing bars. Two bars are cast in each specimen (in the two opposite corners), one in a “good” casting position and the other in “poor” casting position. The proposed test aims to be an economical bond test capable to represent actual conditions of anchored bars in real design practice. The test is also intended to verify whether existing provisions for bond and anchorage in the fib Model Code are suitable in nonconventional concrete. The validity of the proposed beam end type bond test is assessed by the results of more 60 tests on rebars having anchorage length of about 20 times the bar diameter in plain concrete, in fiber reinforced concrete, and in recycled aggregate concrete. Experimental results provide information both on the “top cast effect” in three types of concrete and on the effectiveness of fib Model Code provisions for anchorage when nonconventional concrete is used.

Original languageEnglish
Pages (from-to)4446-4463
Number of pages18
JournalStructural Concrete
Volume24
Issue number4
Early online date4 May 2023
DOIs
Publication statusPublished - Aug 2023

Keywords

  • anchorages
  • bond in concrete
  • bond test
  • Model Code
  • top cast effect

ASJC Scopus subject areas

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

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