Mechanical Properties of Steel-FRP Composite Bars under Tensile and Compressive Loading

Abstract

The factory-produced steel-fiber reinforced polymer composite bar (SFCB) is a new kind of reinforcement for concrete structures. The manufacturing technology of SFCB is presented based on a large number of handmade specimens. The calculated stress-strain curves of ordinary steel bar and SFCB under repeated tensile loading agree well with the corresponding experimental results. The energy-dissipation capacity and residual strain of both steel bar and SFCB were analyzed. Based on the good simulation results of ordinary steel bar and FRP bar under compressive loading, the compressive behavior of SFCB under monotonic loading was studied using the principle of equivalent flexural rigidity. There are three failure modes of SFCB under compressive loading: elastic buckling, postyield buckling, and no buckling (ultimate compressive strength is reached). The increase in the postyield stiffness of SFCB rsf can delay the postyield buckling of SFCB with a large length-to-diameter ratio, and an empirical equation for the relationship between the postbuckling stress and rsf is suggested, which can be used for the design of concrete structures reinforced by SFCB to consider the effect of reinforcement buckling.

Investigating Tensile Behavior of Sustainable Basalt–Carbon, Basalt–Steel, and Basalt–Steel-Wire Hybrid Composite Bars

“…The results of the samples show that this process caused nonlinear behavior in these types of composite hybrid bars. Sun et al [41] investigated steel-FRP composite bars under tensile and compressive loads. Their results show that the failure of these bars under compressive loads can be divided into three categories, including no buckling, post-yield buckling, and elastic buckling.…”

“…Their results show that compressive yield load of hybrid composite bars had nothing to do with the slender ratios, and the ultimate compressive load was inversely relevant to the slender ratio. Sun et al [41] carried out research to evaluate the tensile and compressive behavior of hybrid composite bars. Their results indicate that there are three different modes of failure under compressive loads, including elastic buckling, post-yield buckling, and no buckling.…”

Compressive Behavior of Sustainable Steel-FRP Composite Bars with Different Slenderness Ratios

“…Therefore, SFCB can be used as a superior reinforcement for concrete elements such as concrete beams or columns to improve their overall seismic performance and ensure their long-term serviceability [25][26][27]. However, while previous studies have mostly focused on the tensile properties of SFCBs [28,29] and the prediction of the compressive behaviors of SFCBs through theoretical approaches [30], the actual compressive properties of SFCBs, which could be beneficial to the seismic assessment and design for the SFCB reinforced concrete structures, are still unclear.…”

Low‐Cycle Flexural Fatigue Behavior of Concrete Beam Reinforced with Hybrid FRP‐Steel Rebar

“…Meanwhile, Kara et al [15] predicted numerically the flexural behavior of hybrid FRP-steel RC beams. Sun et al [16] reported that most of the studies dedicated to the hybridreinforced concrete beam focused on the corrosion control and stiffness improvement and investigated the mechanical properties of the hybrid rebar under tensile, repeated tensile, and compressive loading. e fatigue problem in RC beams has also been dealt in numerous studies [17][18][19][20][21].…”

“…Some studies also examined the fatigue flexural behavior of corroded RC beams strengthened with FRP sheets [20,21]. Sun et al [16] evaluated the behavior of the hybrid rebar subjected to cyclic tensile loading and stressed the role of the postyielding stiffness of the rebar owing to the combination of the linear elastic FRP and the elastic-plastic steel bar. Harris et al [22] also examined experimentally the cyclic behavior of the hybrid FRP-steel bar, and Won et al [23] evaluated the durability of the hybrid FRP-steel bar exposed to marine environment.…”