Enhanced ultra-high-performance concrete component made of mixed fiber reinforced plastic (FRP) bars

Abstract

The invention relates to an enhanced ultra-high-performance concrete component made of fiber reinforced plastic (FRP) bars and is suitable for the field of beam components of building and bridge structures and particularly suitable for the environment strong in corrosivity. The enhanced ultra-high-performance concrete component comprises ultra-high-performance concrete and a framework poured inside and composed of the mixed FRP bars. The enhanced ultra-high-performance concrete component gives full play to the advantages of the ultra-high-performance concrete and the mixed FRP bars, overcomes the shortcomings that a single FRP material is insufficient in ductility, effectively reduces a section, saves materials and energy and simultaneously enlarges the available space, the two materials are good in corrosion resistance and particularly suitable for the environment strong in corrosivity, and durability of the structure can be greatly improved. The enhanced ultra-high-performance concrete component made of FRP bars is simple in construction process, suitable for prefabricating production, can be constructed on site when the requirements on performance of the ultra-high-performance concrete are not high, and is flexible in construction method and favorable for popularization application in engineering of the two materials and research and development of novel materials.

Description

technical field [0001] The invention is a hybrid FRP tendon reinforced ultra-high performance concrete beam member, which is suitable for the field of beam members of buildings and bridge structures, and is especially suitable for environments with strong corrosiveness. Background technique [0002] FRP material has the advantages of high strength, light weight, high elastic modulus, fatigue resistance and good corrosion resistance, etc., and is currently widely used in the field of structural reinforcement, but because a single FRP material is a brittle material with poor deformation ability, it is compared with Ordinary concrete composites, which are also brittle materials, not only have poor structural ductility, but also limit the stress redistribution of the structure, which severely restricts the application of single FRP in new structures. Hybrid FRP reinforcement is a composite reinforcement formed by mixing two or more fibers with different tensile strength, elongat...

AI Technical Summary

Problems solved by technology

[0004] Commonly used reinforced concrete beams have the following defects: ordinary concrete has poor crack resistance, and only non-high-strength steel bars can be used, which limits the use of high-strength steel bars; due to the low strength of concrete and steel bars, when the load is large, only rely on The method of increasing beam section size and reinforcement to improve its bearing capacity not only causes great loss of materials, increases construction cost and construction difficulty, but also severely compresses available space due to large section; The tension zone under the load has cracked, and the cracks appear in the form of wide main cracks. Excessive cracks not only cause the beam stiffness to decrease, but the deflection increases, which affects the normal use of the structure and causes unsafe psychological effects on people. Under the erosion of external bad media, it will gradually rust, which will reduce the structural bearing capacity, reduce durability and shorten the service life

[0005] If a single FRP bar is used to replace the stressed steel bar, although the corrosion of the stressed bar can be avoided, both FRP bars and concrete are brittle materials, which will cause insufficient ductility of the structure and may cause brittle failure

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