Abstract
This paper presents a fatigue assessment model that was developed for corroded reinforced concrete (RC) beams strengthened using prestressed carbon fiber-reinforced polymer (CFRP) sheets. The proposed model considers the fatigue properties of the constituent materials as well as the section equilibrium. The model provides a rational approach that can be used to explicitly assess the failure mode, fatigue life, fatigue strength, stiffness, and post-fatigue ultimate capacity of corroded beams strengthened with prestressed CFRP. A parametric analysis demonstrated that the controlling factor for the fatigue behavior of the beams is the fatigue behavior of the corroded steel bars. Strengthening with one layer of non-prestressed CFRP sheets restored the fatigue behavior of beams with rebar at a low corrosion degree to the level of the uncorroded beams, while strengthening with 20- and 30%-prestressed CFRP sheets restored the fatigue behavior of the beams with medium and high corrosion degrees, respectively, to the values of the uncorroded beams. Under cyclic fatigue loading, the factors for the strengthening design of corroded RC beams fall in the order of stiffness, fatigue life, fatigue strength, and ultimate capacity.
Highlights
Infrastructure such as bridges and marine structures are prone to corrosion, and these structures are usually subjected to repeated loading
An fatigue assessment model (FAM) based on the fatigue properties of the constituent materials and cross-sectional stress analysis was proposed to assess the fatigue behavior of corroded beams strengthened with prestressed carbon fiber-reinforced polymer (CFRP) sheets
An FAM based on the fatigue properties of the constituent materials and a cross-sectional stress analysis was proposed to assess the fatigue behavior of corroded beams strengthened with prestressed CFRP sheets
Summary
Infrastructure such as bridges and marine structures are prone to corrosion, and these structures are usually subjected to repeated loading. A sufficient number of studies have investigated the strength, serviceability, prestress losses, and CFRP systems in general, few studies have investigated the fatigue performance of members with prestressed CFRP sheet applications. The second phase intends to develop an overall assessment model capable of assessing the fatigue behavior of corroded RC beams strengthened with prestressed CFRP sheets and to discuss whether prestressed CFRP systems are applicable to RC beams with medium and high corrosion degrees. The model provided a rational approach that can be used to explicitly assess the failure mode, fatigue life, fatigue strength, stiffness, and post-fatigue ultimate capacity of CFRP-strengthened corroded beams under fatigue loading by considering the influences of different corrosion degrees, load ranges, and prestressed levels
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