Structural strengthening and condition monitoring device and method of multi-core optical fiber composite woven carbon fiber cloth

Abstract

The invention discloses a structural strengthening and condition monitoring device and method of a multi-core optical fiber composite woven carbon fiber cloth. The device comprises a carbon fiber cloth, multi-core optical fiber, a multi-core optical fiber coupler, a light switch and a distributed optical fiber Brillouin sensing system. The multi-core fiber is woven in the carbon fiber cloth to form the multi-core fiber composite woven carbon fiber cloth, the impregnation and cementation of the multi-core fiber composite woven carbon fiber cloth are carried out on the surface of a civil structure for strengthening, the distributed optical fiber Brillouin sensing system, the light switch, the multi-core optical fiber coupler and the multi-core optical fiber are connected in sequence. The Brillouin frequency shift of each core in the multi-core optical fiber is measured by switching of the light switch, when the civil structure changes, the multi-core fiber deforms, and the stress change,bending change and temperature change of the civil structure are demodulated. The structural strengthening and condition monitoring device and method of the multi-core optical fiber composite woven carbon fiber cloth can detect the reinforcement state while reinforcing the civil structure, and multi-parameter monitoring can be realized at the same time, monitoring is accurate, and the cost is low.

Description

technical field [0001] The invention belongs to the field of civil engineering structures, and relates to a civil structure reinforcement detection technology, in particular to a multi-core optical fiber composite braided carbon fiber cloth structure reinforcement and state monitoring device and method. Background technique [0002] Civil engineering structures have been in service for a long time. During use, due to aging of materials, increased loads, damage to structural parts, changes in use functions, design and construction defects, etc., the bearing capacity of the original structure cannot meet the new requirements. If it is all overthrown and restarted, it will inevitably increase the social burden, cause waste of resources and environmental pollution, so at present, domestic and foreign countries mostly adopt reinforcement or repair methods for this situation. The use of carbon fiber sheet (CFRP) to strengthen and repair concrete structures is effective and cost-ef...

AI Technical Summary

Problems solved by technology

This technology can expand the function of carbon fiber cloth, and at the same time solve the problem of difficult laying of sensors

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