Abstract
This paper presents experimental studies on the compressive behavior of a sustainable steel-fiber reinforced composite bar (SFCB) under uniaxial compressive loading. The SFCB, combined with steel and fiber reinforced polymer (FRP), is expected to significantly enhance structural safety and sustainability. A new test method with LVDT and extensometer sensors was developed and verified through experiments to test the tensile and compressive behavior of the SFCB. Fifty-four specimens including SFCB and inner steel bar (ISB) with different slenderness ratios were tested. The test results indicated that the initial compressive elastic modulus of the SFCB was essentially the same as its initial tensile elastic modulus. The compressive yield load of the SFCB was essentially irrelevant to the slenderness ratio, and the ultimate compressive stress of the SFCBs varied inversely with the slenderness ratios. The squash load of the SFCB tended to be conservative for predicting the compressive yield load of the SFCB, while the equivalent critical global buckling load of the SFCB was much higher than its corresponding compressive yield load and ultimate load due to the inelastic buckling mechanism of the SFCB within the range of the equivalent slenderness ratios studied in this paper.
Highlights
During earthquakes, the longitudinal reinforcing bars of concrete members may experience significant lateral deformation initiated by spalling of the concrete cover due to inferior factors such as harsh environments, improper construction practices, and natural hazards
The applicability of FRP bars has been restricted by the amount of inferior factors such as significant discreteness [17], insufficient shear capacity, low elastic modulus (for glass-fiber reinforced polymer (GFRP) bars and basalt-fiber reinforced polymer (BFRP) bars [18,19]), relatively lower compressive strength compared to tensile strength [20], and last but not least, poor ductility, which would potentially lead to a dangerous brittle failure mode in the FRP reinforced concrete structures
This paper presents the experimental studies on the compressive properties of a sustainable steel-fiber reinforced composite bar (SFCB) under uniaxial compression loading
Summary
The longitudinal reinforcing bars of concrete members may experience significant lateral deformation initiated by spalling of the concrete cover due to inferior factors such as harsh environments, improper construction practices, and natural hazards. This oversized lateral deformation of the longitudinal reinforcements reduces the response ductility of the concrete members, which cannot be evaluated precisely using analytical models that neglect inelastic material mechanisms [1]. The slenderness ratio, initial eccentricity ratio, and tensile property are commonly regarded as the three primary factors affecting the compressive properties such as the buckling strength and post-buckling behavior of reinforcing bars. The compressive behavior of the SFCBs as well as their major mechanical properties were comprehensively studied and statistically analyzed
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