Abstract
The strengthening method of using hybrid fiber reinforced polymer is an effective way to increase the strengthening efficiency and lower the cost. This paper focuses on simulating the flexural behavior of reinforced concrete beam strengthened by prestressed C/GFRP (Carbon-Glass hybrid Fiber Reinforced Polymer) with different hybrid ratios and prestress levels. An elastoplastic damage constitution is used to simulate the mechanical behavior of concrete. A cohesive zone model under mixed mode is adopted to describe the debonding behavior of the FRP-concrete and concrete-steel interface. The results show good agreement with the experiment in the load-deflection curve, load-stress curve of steel, and HFRP. Furthermore, the failure mode of concrete and FRP debonding obtained from numerical simulation is the same as the test. Considering the improvement of the bending capacity, stiffness, and ductility of the strengthened beam in this paper, the best hybrid ratio of carbon to glass fiber is 1:1, and the suitable prestress level is between 30 and 50% of its ultimate strength.
Highlights
Environmental factors, material aging, and overloading may affect the bearing capacity of reinforced concrete structures
The modulus and strength of CFRP are higher compared to the values of GFRP (Glass Fiber Reinforced Polymer), but the drawback is that the elongation of CFRP is relatively low, which makes the failure mode of the reinforced concrete structure brittle
Chen et al [4] compared the flexural fatigue properties of RC (Reinforced Concrete) beams strengthened with carbon/glass hybrid FRP, carbon/basalt fiber hybrid FRP, and BFRP (Basalt Fiber Reinforced Polymer), and the results showed that the fatigue life of the beam strengthened with carbon/glass hybrid FRP was the longest
Summary
Environmental factors, material aging, and overloading may affect the bearing capacity of reinforced concrete structures (such as beams, columns, slabs, etc.). Attari et al [1] reported that the capacity of the beam strengthened by C/GFRP (Carbon/Glass hybrid Fiber Reinforced Polymer) increases significantly, and the increase does not come with brutal ductility loss. Chen et al [4] compared the flexural fatigue properties of RC (Reinforced Concrete) beams strengthened with carbon/glass hybrid FRP, carbon/basalt fiber hybrid FRP, and BFRP (Basalt Fiber Reinforced Polymer), and the results showed that the fatigue life of the beam strengthened with carbon/glass hybrid FRP was the longest He et al [5] studied the anti-cracking effect of carbon/glass hybrid FRP strengthened concrete beams and discussed the strengthening mechanism of hybrid fibers. Xu et al [10] and Obaidat [11] compared three methods of joint consolidation, the spring element, and cohesive element to simulate the interface between FRP and concrete. In this paper, the constitutive models of concrete and interface are proposed and implemented by the user subroutine UMAT of the finite element software Abaqus, and the strengthening effect of HFRP is numerically studied
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