Characterization of Steel Wire- and Carbon/Glass Hybrid Fiber-Reinforced Polymer Bars in Compression

This paper reports on the compressive properties of a new steel wire- and carbon/glass hybrid fiber-reinforced polymer (S-CG HFRP) bar. The influence of the carbon and glass fiber volume proportion (V-c/V-g), steel wire replacement ratio (V-s), fiber volume ratio (V-f), fiber arrangement, and ratio of the unbraced length to the bar diameter (L-u/d) on the compressive behavior of the S-CG HFRP bars was experimentally investigated. The failure mechanisms were analyzed, revealing that the failure mode changed from fiber microbuckling to fiber macrobuckling with an increase in L-u/d. Adding steel wires resulted in a decrease in the compressive modulus of the S-CG HFRP bars. The compressive strength of the S-CG HFRP bars was not effectively improved by adding steel wires or carbon fibers and was governed by the L-u/d ratio. The results showed that the compressive modulus and strength of the S-CG HFRP bars were approximately 90% and 28% of their tensile modulus and strength, respectively. Finally, the relationship between the compressive and tensile properties of the S-CG HFRP bars was established. Simplified empirical equations were proposed to estimate the compressive strengths of S-CG HFRP bars with different L-u/d ratios. (c) 2023 American Society of Civil Engineers.