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Intelligent steel strand based on optical fiber Brillouin sensing and preparation and full dimension monitoring method thereof

A technology for intelligent steel strands and steel strands, which is applied in optical testing flaws/defects, measuring devices, and material analysis by optical means, etc. Distributed testing, enhanced grip, stability and durability

Inactive Publication Date: 2009-05-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of smart steel strand is also a local sensor, which can only give the average stress value of a certain point of the steel strand, and cannot reflect the prestress loss of each section of the steel strand and the full-scale stress distribution.

Method used

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  • Intelligent steel strand based on optical fiber Brillouin sensing and preparation and full dimension monitoring method thereof
  • Intelligent steel strand based on optical fiber Brillouin sensing and preparation and full dimension monitoring method thereof

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0022] combine figure 1 , the diameter of the FRP-OF smart bar in this embodiment should be equal to the middle wire of the steel strand, and the length is slightly longer than the middle wire (about 5cm), which is convenient for the access of the transmission jumper; considering that the smart steel strand can be compatible with the cloth Two major commercial systems of Liyuan distributed sensing technology: BOTDA and BOTDR, FRP-OF smart tendons use dual optical fibers;

[0023] combine figure 2 , The composition of the FRP-OF intelligent steel strand includes: anchorage 1, high ductility metal foil 2, steel strand outer wire 3, FRP rib 4 containing optical fiber and optical fiber 5.

[0024] The product of this embodiment can adopt following method to make:

[0025] 1) Calculate the blanking length of the FRP bars according to the length of the...

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Abstract

The invention provides an intelligent steel strand based on optical fiber Brillouin sensing, as well as a preparation method and a full-scale monitoring method thereof. The intelligent steel strand comprises a FRP-OF intelligent bar, a steel strand outer wire, a high-ductility metal foil and optical fiber, wherein the surface of the FRP-OF intelligent bar is wrapped by at least one layer of high-ductility metal foil; the FRP-OF intelligent bar and the steel strand outer wire are twisted and molded; and the optical fiber is arranged in the FRP-OF intelligent bar and threaded out from two ends. The steel strand has intelligent sensing characteristic, is high in testing precision, has the advantages of electromagnetic interference resistance, absolute measurement, good stability and durability, and overcomes the disadvantages that electric measurement, local fiber grating and other sensing techniques are incapable of full-distribution type test. Meanwhile, the intelligent steel strand can be used to monitor the prestress loss of prestress engineering, and is particularly applicable to the health monitoring for structures such as parallel steel-strand stay ropes of cable-stayed bridges. The intelligent steel strand is simple in manufacturing process, low in cost and particularly suitable for industrial production.

Description

(1) Technical field [0001] The invention relates to the field of structural damage monitoring, in particular to a steel strand stress monitoring technology. (2) Background technology [0002] Steel strands are widely used in prestressed concrete and bridge cables (such as stay cables, suspenders and tie rods), cables and other cable structures. Steel strands are generally in a state of high stress and harsh environments during long-term service, and their stress state is directly related to the service function (such as excessive deflection) and safety (such as too wide cracks, fractures, etc.) of the structure. Therefore, it is of great significance to monitor the stress state of the steel strand structure in the whole process from construction to service. Steel strand structures, such as prestressed structures, are often also affected by strand bending angles, friction or slippage with bonded substrates, friction with casing, discrete creep of concrete structures, presenc...

Claims

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Application Information

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IPC IPC(8): G01N21/84G01N21/88
Inventor 周智何建平吴源华欧进萍
Owner HARBIN INST OF TECH
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