Shape memory alloy prestressed U-stirrup-FRP reinforced concrete beam and construction technology thereof

Abstract

The invention relates to a shape memory alloy prestressed U-stirrup-FRP reinforced concrete beam and a construction technology thereof. The shape memory alloy prestressed U-stirrup-FRP reinforced concrete beam comprises to-be-reinforced concrete beam, externally bonded FRP, a shape memory alloy prestressed U-stirrup and externally applied sealing mortar. The to-be-reinforced concrete beam is a common concrete beam. The externally bonded FRP is cloth or a board and is fixed to the outer portion of the concrete beam by means of side adhesion or U-shaped adhesion, or the bottom of the externallybonded FRP adheres to the beam in the longitudinal direction of the beam. The mortar is polymer mortar and applied to the outside of the prestressed U-stirrup in a sealing manner. The invention also discloses the construction technology of the shape memory alloy prestressed U-stirrup-FRP reinforced concrete beam. Due to the annular tightening action of the shape memory alloy prestressed U-stirrupand reinforcement of the sealing mortar, fiber stripping during traditional FRP reinforcement is effectively avoided, the utilization ratio of the FRP is improved, and then the shear resistance and bending resistance of the beam are improved; and in this way, the bearing capacity of the beam is improved. The sealing applied mortar further can effectively prevent the shape memory alloy prestressedU-stirrup from being corroded.

Description

technical field [0001] The invention relates to a shape-memory alloy prestressed U-shaped hoop-FRP reinforced concrete beam and a construction technique thereof, belonging to the technical field of concrete structure reinforcement. Background technique [0002] Fiber Reinforced Polymer (FRP) has been widely used in the field of concrete structure reinforcement because of its light weight, high strength, corrosion resistance and many other advantages. When it is made into cloth and pasted on the surface of concrete beams for shear reinforcement, there are generally three forms of side paste, U-shaped paste and closed paste; when pasted on the surface of concrete beams for bending reinforcement, generally along the bottom surface of the beam The way the vertical axis is pasted. Existing experimental studies have shown that almost all side pastes, most U-shaped pastes and beam bottoms pasted along the longitudinal axis will cause fiber cloth peeling, resulting in limited incre...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a shape memory alloy prestressed U-shaped hoop-FRP reinforced concrete beam and its construction technology, the purpose is to solve the traditional FRP reinforcement when using side sticking, U-shaped sticking or bottom surface straight sticking fibers appearing when the beam is reinforced Cloth peeling off, resulting in limited increase in the bearing capacity of reinforced beams, low utilization rate of fiber strength, etc.

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