Fiber thin plate-steel composite reinforced rc structure and its method and application

Abstract

The invention discloses a fiber sheet-steel plate combination reinforced RC structure and a method and application thereof. A fiber sheet-steel plate combined plate is of a three-layer structure, the inner layer in contact with concrete is a low-elasticity-modulus high-strength glass fiber sheet or an aramid fiber sheet or a basalt fiber sheet, the middle layer is a steel plate, and the outer layer is an intermediate-elasticity-modulus or high-elasticity-modulus carbon fiber sheet. A method for preparing and reinforcing an RC structure of the combined plate comprises the steps that the fiber sheet and the steel plate as well as the fiber sheet and the concrete are bonded through epoxy resin super-strong glue, and anchoring is conducted through bolts embedded in the RC structure. The RC structure is reinforced through the combination reinforcing method, the bearing capacity, the rigidity and the ductility of an original structure can be substantially improved, and the RC structure is good in deformation coordinated property, resistant to corrosion, cracking, fatigue and impact, and durable.

Description

technical field [0001] The invention belongs to the field of civil construction and transportation engineering, and in particular relates to a fiber thin plate-steel plate combined reinforcement RC structure and a method and application thereof. Background technique [0002] Pasting steel plate reinforcement method and pasting Fiber Reinforced Polymer (FRP) reinforcement method are the two most commonly used passive reinforcement methods for concrete structures in civil construction and transportation engineering, which can effectively improve the bearing capacity of the original structure. It has the advantages of short construction period and little impact on the appearance of the structure, but there are still some problems. [0003] The advantage of pasting steel plate reinforcement method is that it can effectively improve the rigidity and bearing capacity of the structure, but the disadvantages are: 1) the elastic modulus of the steel plate (E s =206GPa) and concrete ...

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Problems solved by technology

[0003] The advantage of pasting steel plate reinforcement method is that it can effectively improve the rigidity and bearing capacity of the structure, but the disadvantages are: 1) the elastic modulus of the steel plate (E s =206GPa) and concrete modulus of elasticity (E c =22~38GPa) The difference is large, resulting in a large stress gradient at the interface between the steel plate and concrete, uncoordinated deformation, and prone to stress concentration; 2) The steel plate itself is prone to corrosion, which is not only difficult to repair and maintain, but also affects the durability of the structure ; 3) The connection between the steel plate and the concrete mainly depends on the bolts and other connectors. The mechanical properties and durability of the connectors will not only affect the reinforcement effect, but also cause new damage and stress concentration to the reinforced concrete structure; 4) The steel plate is relatively heavy, which increases the self-weight of the original structure; 5) The thick steel plate (6-10mm) is also heavy, which will bring certain difficulties to the construction

[0004] The biggest advantage of sticking FRP reinforcement method is light weight and high strength, and the corrosion resistance of carbon fiber reinforced composite (CFRP) is good. However, due to the shortcomings of the material itself, such as unidirectionality and brittleness, this method has the following problems: 2) If proper measures are not taken, the anchoring effect of FRP material is poor, and the reinforced structure often suffers from peeling failure at the interface between FRP and concrete, and the high-strength advantage of FRP material cannot be fully utilized; 3) Regardless of FRP fracture or FRP-concrete interface peeling failure, FRP is brittle failure, which is not conducive to the safety warning of engineering structures

Due to the elastic modulus E of the carbon fiber cloth used c ≥230GPa, which is very different from the elastic modulus of concrete, resulting in a large stress gradient at the interface between carbon fiber cloth and concrete, uncoordinated deformation, and stress concentration

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