Strengthening of isolated square footings using passive wrapping systems

Research output: Contribution to journalArticlepeer-review

Abstract

This paper introduced three new strengthening systems for isolated footings: BFRP wrapping system, CFRP wrapping system, and steel jacketing system. The proposed systems are more practical than the current traditional methods, which involves installing many dowel bars and splicing reinforcing steels to join new and old concrete segments. In the proposed three new systems, BFRP wraps, CFRP wraps, or steel jackets are installed on the exterior surface of the enlarged footing, with construction adhesive or a few steel dowels being applied to the contact surfaces. To investigate the effectiveness of three systems, forty-four models were constructed in ABAQUS, with different parameters being considered. All footings investigated failed in punching shear, including original and retrofitted footings. According to FEA results and parametric studies, the three strengthening systems were capable of improving the punching shear resistance of footings. By introducing a new factor η, the punching shear equation in Eurocode 2 was modified to predict the punching shear resistances of the strengthened footings. A linear formula was developed to present the relationship between the new factor η and the investigated parameters.

Original languageEnglish (US)
Pages (from-to)41-54
Number of pages14
JournalComputers and Concrete
Volume27
Issue number1
DOIs
StatePublished - Jan 2021

Keywords

  • FRP wrapping
  • Finite element analysis
  • Isolated footing
  • Modified equation
  • Punching shear
  • Steel jacketing
  • Strengthening

ASJC Scopus subject areas

  • Computational Mechanics

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