Flexure Test and Strength Analysis of T-Beams Reinforced With Prestressed CFRP and Steel Sheet

The paper presents flexure tests of 10 T-beams, their methodology, specimen fracture, the investigation of prestressed carbon fiber-reinforced plastic (CFRP) layers, T-beam carrying capacity and rigidity subjected to a combined reinforcement with presetressed CFRP and a steel sheet. It is shown that T-beam undergoes flexural fracture and its carrying capacity increased more than by 90 %. T-beam prestressing ranging between 5- 15%, results in the increase in prestress and yield load values and the decrease in the ultimate load. The rigidity has no obvious change before the yield. In presetressing, it increased up to 10-15 %. The values of prestress, yield and ultimate loads increase with the number of reinforced layers. After the yield, the rigidity of T-beam reinforced with two CFRP layers increased twice as compared to that reinforced with one CFRP layer. When the number of CFRP layers is more than two, the rigidity tends to a gradual increase. With the increase in predamage, the yield and ultimate loads linearly reduce. After the yield, the rigidity of T-beam reinforced with two CFRP layers increased twice.

железобетонная тавровая балка, предварительно напрягаемый углепластик, стальной лист, испытание на изгиб, комбинированное усиление, несущая способность, жесткость, reinforced concrete T-beam, prestressed CFRP, steel plate, combined reinforcement, flexural test, carrying capacity, rigidity

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