Abstract
The composite strengthening beam combined with a variety of reinforcement technology, complementary advantages.In order to study the mechanical behavior of T-beam strengthened with CFRP board, external angle steel and external prestressed steel strand, six reinforced test beams were fabricated to compare and analyze the structural characteristics of bending stiffness, crack development and bearing capacity. The research shows that the beam strengthened by CFRP board, external angle steel and external prestressed steel strand has good working performance. The rebound force of the bending deformation of the external angle steel and the upward force of the external prestressed steel strand reliably anchor the carbon fiber board, avoiding the bond failure and slippage of the CFRP.The three kinds of reinforcing materials work together and complement each other, which can give full play to their respective strength. The composite strengthened beam with CFRP board, external angle steel and external prestressed steel strand can greatly improve the cracking load, structural stiffness and ultimate bearing capacity of the original beam, and the reinforcement effect is optima.
Highlights
A single reinforcement method has its own advantages and disadvantages, and it is often unable to complete the reinforcement beam with a large bearing capacity demand
When a large strengthening bearing capacity is needed, if carbon fiber plate is used for reinforcement, interface peeling failure and anchoring failure will occur due to insufficient bond strength between carbon fiber plate and concrete, so the strength of carbon fiber material cannot be fully utilized [4,5,6,7]
Pasting carbon fiber board - outsourcing Angle externally prestressed composite beam is the use of Angle steel bending deformation of rebound and prestressed reinforcement method is lifted up to reliable anchorage of the carbon fiber plate, can reduce the carbon fiber board bond-slip, ensure that the carbon fiber plate material strength, give full play to the three kinds of reinforcement materials to work together, the comprehensive reinforcement beam can greatly improve the cracking load and ultimate load, significantly improve the performance of the concrete beam
Summary
A single reinforcement method has its own advantages and disadvantages, and it is often unable to complete the reinforcement beam with a large bearing capacity demand. Sticking carbon fiber board, outsourcing Angle steel and external prestressing are the most commonly used reinforcement methods for reinforced concrete beams. Pasting carbon fiber board - outsourcing Angle externally prestressed composite beam is the use of Angle steel bending deformation of rebound and prestressed reinforcement method is lifted up to reliable anchorage of the carbon fiber plate, can reduce the carbon fiber board bond-slip, ensure that the carbon fiber plate material strength, give full play to the three kinds of reinforcement materials to work together, the comprehensive reinforcement beam can greatly improve the cracking load and ultimate load, significantly improve the performance of the concrete beam
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