FRP anti-bending reinforcement design method based on component early warning wire theory

Abstract

The invention relates to an FRP anti-bending reinforcement design method based on a component early warning wire theory. According to the method, an FRP plate is attached to the outer surface of a to-be-reinforced component to serve as a reinforcing material. The reinforcing material is divided into an early warning part and a bearing part. The two parts are made of the same material, the FRP plate of the early warning part is regarded as an early warning wire, the prestress applied by the early warning part is larger than that applied by the bearing part, the area of the early warning part issmaller than that of the bearing part, and the early warning part is arranged so that the component can have an obvious early warning function before being damaged. The method can send out an early warning signal in advance under the condition that the normal use state of the reinforcing component is not influenced, and monitor the use period of the reinforced structure in real time. The early warning wire is broken and the early warning signal is sent out when an early warning part of components reach the tensile strength limit point of the components, brittle failure of the reinforced structure is avoided, and a new solution is provided for brittle failure caused by insufficient ductility of the reinforced structure in the use period.

Description

technical field [0001] The invention relates to a design method of FRP anti-bending reinforcement based on the early warning wire theory of components. Background technique [0002] At present, the total area of ​​various existing buildings in our country is at least 10 billion square meters, and many of these structures are in urgent need of reinforcement and maintenance: for example, a large number of industrial and civil buildings built in the early days of the founding of the People's Republic of China, and there are various safety hazards for buildings that have been in service for a long time. Hidden dangers, etc.; and with the update of relevant national norms and standards, the functional indicators of many existing structures can no longer meet the requirements of the new norms; structures built according to the new standards have also experienced deterioration in bearing capacity during long-term use. [0003] At present, there are a variety of reinforcement method...

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Problems solved by technology

[0002] At present, the total area of ​​various existing buildings in our country is at least 10 billion square meters, and many of these structures are in urgent need of reinforcement and maintenance: for example, a large number of industrial and civil buildings built in the early days of the founding of the People's Republic of China, and there are various safety hazards for buildings that have been in service for a long time. Hidden dangers, etc.; and with the update of relevant national norms and standards, the functional indicators of many existing structures can no longer meet the requirements of the new norms; the structures built according to the new standards also have the phenomenon of deterioration of bearing capacity during long-term use

[0003] At present, there are a variety of reinforcement methods for concrete structures, among which fiber reinforced composite material (FRP) reinforcement method is an emerging reinforcement method. After FRP reinforcement, the bearing capacity, stiffness and fatigue resistance of components have been significantly improved, but The reinforcement by pasting ordinary non-prestressed FRP materials has the phenomenon of low material strength utilization rate, little improvement in the performance of the normal service state of the reinforced member, and a significant decrease in the ductility index. In the form of being pulled off, there is no obvious sign before the failure, and the failure occurs suddenly, which is unsafe, which limits the popularization and application of prestressed FRP reinforcement

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