Super large cable force self-sensing intelligent cable and measuring method based on fiber strain sensing

Abstract

The invention discloses a super large cable force self-sensing measuring method based on fiber strain sensing, comprising the following steps: fiber strain sensing elements are pre-embedded in the anchorage zones of steel cables and measurement of the steel cable force is realized by measuring the strain capacity of the fiber strain sensing elements. The invention also discloses a super large cable force self-sensing intelligent cable based on fiber strain sensing. The invention has the beneficial technical effects of converting the large strain measurement of the cable to the small strain measurement of the anchorage zone, facilitating the common fiber strain sensors to meet the requirement of large strain measurement range and be suitable for cable force measurement of cables for especially big bridges, greatly lowering the measuring difficulty and cost, reducing the damage on the fiber strain sensors and prolonging the service lives of the fiber strain sensors.

Description

Technical field: [0001] The invention relates to a steel cable force self-sensing measurement technology, in particular to an ultra-large cable force self-sensing intelligent cable and a measurement method based on optical fiber strain sensing. Background technique: [0002] The force of bridge cables is one of the important symbols to reflect whether the bridge is in normal operation state, and it is of great practical significance to accurately measure the force of bridge cables. [0003] The existing cable force measurement methods mainly include pressure sensor method, frequency vibration method and magnetoelastic method. In the pressure sensor method, since both the load-bearing ring and the sensor are subjected to continuous pressure from the cable, there is no chance of recovery, which can easily cause fatigue of the pressure-bearing ring and its sensor, so the service life is limited. Because the measurement results of the vibration frequency method are affected by ...

AI Technical Summary

Problems solved by technology

For super-large bridge cables, due to the large traction force of the cables, the deformation of the cables is much larger than that of conventional cables. The working range is only below 4000με, and the strain range of the cables used for super-large bridges has greatly exceeded the strain working range of the cable force measurement method using optical fiber strain sensing technology

If it is overloaded, it will not only cause damage to the optical fiber strain sensing element, but also affect the strain conduction characteristics of the bonding interface between the optical fiber sensing element and the composite material in the composite rib, and affect the accuracy of the final cable force measurement

However, if a special large-strain optical fiber strain sensing element is used to make composite tendons, the cost of the sensing element and its demodulator will increase tenfold, which is not suitable for popularization and use in bridge cable force engineering applications.

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