Post-tensioning prestressing intelligent reinforcement system based on fiber grating sensing technology

Abstract

The invention relates to a post-tensioning prestressing intelligent reinforcement system based on a fiber grating sensing technology. The system comprises an intelligent steel strand (1), a coating agent layer (2), a sheath (3) and an anchor head. The intelligent steel strand, the coating agent layer and the sheath form an external prestressing intelligent steel strand, the end of the external prestressing intelligent steel strand is connected with a reinforced system through the anchor head, fiber grating sensors (11) are disposed in the intelligent steel strand (1), and the fiber grating sensors (11) include a monitoring fiber grating sensor (111) and a temperature compensation fiber grating sensor (112). According to the system, the fiber grating intelligent steel strand and the post-tensioning prestressing technology are combined and applied to an external prestressing reinforcement system, so that the external prestressing reinforcement system meets the requirements for strength, stability and durability needed by reinforcement and has a sensing characteristic, and the intelligent reinforcement system is formed. The post-tensioning prestressing intelligent reinforcement system can be widely applied to existing post-tensioning prestressing reinforcement structures such as masonry structures, concrete structures and steel structures provided with steel strands serve as stress components.

Description

technical field [0001] The invention relates to the fields of safety monitoring and building structure materials, in particular to a post-tensioning prestressed intelligent reinforcement system based on optical fiber grating sensing technology. Background technique [0002] The prestressed reinforcement method is a method of strengthening the structural members or the whole by adding prestressed steel tie rods or section steel braces. The stress level of the original structure completely eliminates the stress-strain hysteresis phenomenon unique to the general reinforced structure. Therefore, the post-added part and the original structure can work together better, and the overall bearing capacity of the structure can be significantly improved. The prestressed reinforcement method has the triple effects of reinforcement, unloading, and changing the internal force of the structure. It is suitable for the reinforcement of long-span structures, as well as the reinforcement of lar...

AI Technical Summary

Problems solved by technology

[0005] The present invention designs a post-tensioned prestressed intelligent reinforcement system based on fiber grating sensing technology, which solves the technical problem that the existing prestressed reinforcement system cannot take into account the integration of reinforcement and monitoring, and does not consider the long-term application of the solid system The fact that the temperature will definitely change during the process, ultimately leads to a deviation of the calculated force value of the prestressed strand from the real value

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