Abstract
Studies examined experimentally the flexural behavior of concrete beams reinforced with the hybrid FRP‐steel rebar but very few among them evaluated their fatigue performance. In this study, the fatigue test has been performed, and an analytical model for simulating the flexural fatigue behavior of the concrete beam reinforced with the hybrid bar considering its postyielding behavior is developed. A formula relating the postyielding fatigue strain of the rebar to the number of the fatigue cycle is suggested and used in the proposed procedure. The method simulating the low‐cycle behavior of the reinforced concrete beam is found to be satisfactory and can predict the number of cyclic loading to failure.
Highlights
Reinforced concrete (RC) is a composite material in which reinforcement having higher tensile strength or ductility is included in concrete to supplement its low tensile strength and brittleness. e reinforcement is usually a steel bar which makes it prone to corrosion generated by the inevitable attack of harmful substances like chloride ions. is corrosion is a major cause of the loss of durability and structural problems encountered in RC structures [1,2,3,4].Numerous studies were conducted to prevent the rebar corrosion caused by the ingress of chloride ions
Conclusions e hybrid FRP-steel bar was proposed as one solution to solve this problem, and numerous studies reported that the hybrid FRP-steel bar developed superior resistance to chloride attack than the conventional steel. e exural behavior of the concrete beam reinforced with the hybrid FRP-steel rebar was mainly studied experimentally
The present study proposed an analytical model predicting the low-cycle exural fatigue behavior of the concrete beam reinforced with the hybrid FRP-steel bar
Summary
Reinforced concrete (RC) is a composite material in which reinforcement having higher tensile strength or ductility is included in concrete to supplement its low tensile strength and brittleness. e reinforcement is usually a steel bar which makes it prone to corrosion generated by the inevitable attack of harmful substances like chloride ions. is corrosion is a major cause of the loss of durability and structural problems encountered in RC structures [1,2,3,4]. Considering that the corrosion of the rebar is resolved to some extent, it is noteworthy that there are still very few studies predicting analytically the long-term performance like the fatigue behavior, since fatigue may represent one major problem that will be faced by the beam reinforced with the hybrid FRP-steel rebar. The present study intends to further the work of Hwang et al [25] by proposing an analytical model predicting the low-cycle flexural fatigue behavior of the concrete beam reinforced with the hybrid FRP-steel bar. E test results are used to establish a general formula relating the postyielding fatigue strain of the rebar to the number of the fatigue cycle Using this formula, an analytical procedure is proposed based upon the strain compatibility condition to predict the low-cycle flexural fatigue behavior of the RC beam
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