Cyclic Compressive Behavior of Hybrid FRP-Confined Concrete

İspir Arslan M., Dalgic K. D., İlki A.

JOURNAL OF COMPOSITES FOR CONSTRUCTION, vol.25, no.5, 2021 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 5
  • Publication Date: 2021
  • Doi Number: 10.1061/(asce)cc.1943-5614.0001156
  • Journal Name: JOURNAL OF COMPOSITES FOR CONSTRUCTION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Applied Science & Technology Source, Business Source Elite, Business Source Premier, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: CFRP, Concrete confinement, Compression, Cyclic axial loading, Hybrid confinement, PET-FRP, Large rupture strain, STRESS-STRAIN MODEL, FIBER-REINFORCED POLYMER, AXIAL BEHAVIOR, COLUMNS
  • Istanbul Technical University Affiliated: Yes

Abstract

The aim of this study is to define the cyclic axial behavior of hybrid FRP (fiber reinforced polymer)-confined concrete based on the results of an experimental study presented here. Two different types of fiber sheets with different ultimate tensile strain capacities were used together in a suitable epoxy resin matrix to confine concrete. The inner and outer jackets of the concrete confinement were constituted with carbon (or glass) sheets with a relatively low tensile strain capacity and polyethylene terephthalate (PET) sheets with a high tensile strain capacity. PET fibers, which are a relatively new type of fiber, are made from recycled plastics. By varying the number of layers of the outer fiber sheet, different combinations were formed for the hybrid jackets. To characterize the cyclic axial behavior of hybrid FRP-confined concrete, experimental data were utilized to obtain the axial stress-strain relationship and dilation behavior. Based on the results, a stress-strain model for the envelope curve of the cyclic response of hybrid FRP-confined concrete is proposed.