Method for additionally anchoring reinforced concrete beam strengthened with FRP cloth material in anti-bending way

Abstract

The invention discloses a method for additionally anchoring a reinforced concrete beam strengthened with an FRP cloth material in an anti-bending way, which belongs to the technical field of structural engineering. In the method, an internally-locking anchoring system is formed by opening a groove on the bottom surface of the reinforced concrete beam and embedding the FRP cloth material into the groove. The method comprises the following steps: opening the groove on the bottom surface of the reinforced concrete beam according to a required size and clearing groove dust; pre-treating the bottom surface of the reinforced concrete beam, grinding the bottom surface smoothly and grinding corners of the bottom surface into smooth chamfer angles; cutting the FRP cloth material as required, painting primers on the bottom surface of the reinforced concrete beam and in the groove and treating unsmooth parts by flattening glue; pasting two layers of unidirectional FRP cloth materials on the end parts of the bottom surface of the beam respectively, and then painting surface glue; and embedding the FRP cloth material on the bottom surface of the reinforced concrete beam and filling the groove with the surface glue so as to form the internally-locking anchoring system. The method is suitable for additionally anchoring the reinforced concrete beam strengthened with the FRP cloth material in the anti-bending way.

Description

technical field [0001] The invention relates to an additional anchoring method for flexurally reinforced reinforced concrete beams with FRP cloth, which belongs to the technical field of structural engineering. Background technique [0002] Fiber-reinforced composite (FRP) reinforced reinforced concrete (R.C.) structure has obvious advantages such as high strength and high efficiency, good corrosion resistance and durability, no increase in the weight and volume of components, wide application range, and convenient construction. fields are playing an increasingly important role. [0003] One of the main aspects of FRP application in the strengthening of R.C. structures is the flexural strengthening of beams. However, a large number of experimental studies have shown that early delamination failure often occurs before the beam strengthened by this method reaches the ultimate bearing capacity. It can often be observed in the test that when the peeling failure occurs, the str...

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Problems solved by technology

The U-shaped FRP hoop will slide to a certain extent with the peeling of the FRP material, and it is easy to be cut at the corner, which greatly affects the anchoring effect; the steel plate U-shaped hoop is used, and the steel plate itself also has the problem of peeling damage and the steel plate U-shaped The construction of the hoop is more complicated; for the anchorage of the additional anchor bolt, the anchor bolt can only restrain the peeling when the peeling develops to a certain extent, and the anchor bolt cuts off the FRP wire at the opening position, which will cause stress concentration and cause Destruction of FRP material at the anchor bolt

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