Compressive strength of modified FRP hybrid bars

Marek Urbański

Abstract

Anew type ofHFRPhybrid bars (hybrid fiber reinforced polymer) was introduced to increase the rigidity of FRP reinforcement, which was a basic drawback of the FRP bars used so far. Compared to the BFRP (basalt fiber reinforced polymer) bars, modification has been introduced in HFRP bars consisting of swapping basalt fibers with carbon fibers. One of the most important mechanical properties of FRP bars is compressive strength, which determines the scope of reinforcement in compressed reinforced concrete elements (e.g., column). The compression properties of FRP bars are currently ignored in the standards (ACI, CSA). The article presents compression properties for HFRP bars based on the developed compression test method. Thirty HFRP bars were tested for comparison with previously tested BFRP bars. All bars had a nominal diameter of 8 mm and their nonanchored (free) length varied from 50 to 220 mm. Test results showed that the ultimate compressive strength of nonbuckled HFRP bars as a result of axial compression is about 46% of the ultimate strength. In addition, the modulus of elasticity under compression does not change significantly compared to the modulus of elasticity under tension. A linear correlation of buckling load strength was proposed depending on the free length of HFRP bars.

Author Marek Urbański (FCE / ICE)
Marek Urbański,,
- The Institute of Civil Engineering
Journal seriesMaterials, ISSN 1996-1944
Issue year2020
Vol13
Pages1-17
Publication size in sheets0.8
Keywords in Englishhybrid (HFRP) bars; fiber reinforced polymers (FRP) bars; composite reinforcement;mechanical properties; compressive strength; crushing; buckling
ASJC Classification2500 General Materials Science
DOIDOI:10.3390/MA13081898
URL https://www.mdpi.com/1996-1944/13/8/1898
Languageen angielski
File
materials-13-01898.pdf 4.87 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 04-08-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 1; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.285; WoS Impact Factor: 2018 = 2.972 (2) - 2018=3.532 (5)
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