Bending Test of Concrete Beams Strengthened with Prestressed CFRP Sheets
Researching the flexural performance of prestressed carbon fiber-reinforced polymer(CFRP)strengthened concrete beams involves exploring various reinforcement methods to address deficiencies in bridge reinforcement.In the experimental phase,five test beams were created.One of these served as a reference beam without any reinforcement treatment.The remaining four beams underwent reinforcement using different anchoring methods,various initial prestressing forces,and different reinforcement positions.Through meticulous control of variables,loading tests were conducted to scrutinize differences in flexural performance.The results were noteworthy.Post-reinforcement,the test beams demonstrated a significant increase in load-bearing capacity and stiffness.In comparison to the reference beam,ultimate loads increased by 25%,22.06%,30.78%,and 36.76%,respectively.When reaching the yield load,deflections of the reinforced test beams were consistently less than those of the reference beam.Furthermore,the deflection of the test beam anchored with the cavity self-locking anchorage system was smaller than that of the test beam anchored with the perforated self-locking anchorage system.Within the same anchoring method,the deflection of the test beam with a larger initial prestressing force was consistently smaller than that of the test beam with a smaller initial prestressing force.In conclusion,the application of prestressed carbon fiber-reinforced polymer for the reinforcement of concrete beams proves effective in enhancing flexural performance.The extent of improvement is intricately linked to factors such as the reinforcement position,anchoring method,and the magnitude of the initial prestressing force.
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