A method for monitoring and evaluating service state of fiber tendon pull cable of bridge

By arranging single-mode optical fibers in the cross-section of the fiber reinforcement and employing high spatial resolution strain sensing technology, the problem of internal damage monitoring of fiber reinforcement suspension cables has been solved, enabling real-time damage assessment and safety early warning of fiber reinforcement suspension cables, thus ensuring their safe service.

CN116839776BActive Publication Date: 2026-07-07UNIV OF SCI & TECH BEIJING +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Filing Date
2022-10-19
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing technologies cannot achieve real-time monitoring of continuous distributed damage within the entire length of the fiber reinforcement in a fiber-reinforced cable, nor can they monitor the evolution of damage within the fiber-reinforced cable in real time, nor can they monitor and characterize the service status within the entire length of a parallel fiber-reinforced cable.

Method used

Single-mode optical fibers are arranged in a certain pattern on the cross section of the fiber reinforcement. Millimeter-level high spatial resolution strain sensing technology is used to conduct high spatial resolution strain tests on the fiber reinforcement suspension cable. The real-time stiffness and cable force of the fiber reinforcement are monitored by an OFDR distributed fiber demodulator. The stiffness and internal force of the fiber reinforcement are calculated by combining series and parallel system models, so as to realize the service status monitoring and evaluation of the fiber reinforcement suspension cable.

Benefits of technology

It enables real-time monitoring and evaluation of internal damage to fiber reinforced suspenders, provides timely warnings of damage evolution, offers a basis for safety warnings and replacement, and ensures the safe service of fiber reinforced suspenders.

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Abstract

The application discloses a kind of bridge fiber tendon pull cable service state monitoring and evaluation method, comprising: S1: selecting fiber and matrix, determine the volume content of fiber, single-mode optical fiber is arranged in fiber tendon section according to certain rule, fiber, matrix and single-mode optical fiber are formed, form fiber tendon, according to design bearing capacity, a certain number of fiber tendon is arranged according to regular hexagon, form fiber tendon pull cable for bridge;S2: fiber tendon pull cable bears constant load and live load, uses millimeter level high spatial resolution strain sensing technology, carries out high spatial resolution strain test to fiber tendon pull cable, collects all fiber strain data in fiber tendon pull cable and analyzes strain curve, calculates the stiffness of each fiber tendon and the overall stiffness of fiber tendon pull cable;Service condition fiber tendon pull cable service state monitoring and evaluation are carried out.This method can be effectively applied to real-time monitoring and evaluation of fiber tendon pull cable service state.
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