Abstract
Stay cable is the major load-carrying element in cable-stayed bridges. The process of monitoring cable forces would be beneficial to ensure the safety of bridges. The conventional sensor-based approaches to measure stay cable forces is complicated in operation, time-consuming and relatively expensive. In order to confront these disadvantages, a lightweight measurement method using smartphone imagery was proposed in this paper. The video data acquisition process was first standardized by using a pre-designed target. Then, a novel algorithm to extract the vibration displacement of stay cables under complex condition was developed. An automatic correction algorithm was provided to further improve the displacement results. On top of that, a smartphone-based software for determining cable forces was developed and tested on a real-life bridge. The results showed a maximum error of 1.99% compared with the cable force obtained by using a dynamic tester. The developed software is proven to be feasible in real-life projects and can achieve high accuracy in cable force determination. At the same time, the proposed method does not require a fixed camera for measurement and is not limited by personnel experience and measurement time, facilitating real-time monitoring of multiple projects, multiple cable surfaces and multiple personnel in a visual vibration environment.
Highlights
As a major load-bearing element, stay cables play an important role in a cable-stayed bridge
This paper proposed a lightweight cable force measurement method based on smartphone, which can realize multi-project, multi-cable surface, multiperson and real-time monitoring of cable force in a visual vibration environment at any
Wall/guardrail and the number 3 refers to the QR code for stay cable information toring targets 4-P1 and 4-P2 are attached on the stay cable, while 4-P3 and 4-P4 are attached on the fixed structure
Summary
As a major load-bearing element, stay cables play an important role in a cable-stayed bridge. Chang [14] adopted optical flow methods to eliminate the need for target installation in the proposed image-based technique for cable vibration measurement. Smartphones among all the other mobile devices integrated a wide range of advanced technology such as embedded sensors, growing storage capability, computational power and network connections For this reason, a group of studies utilized smartphones as the smart terminal to collect dynamic properties of stay cables. Most of the above-mentioned studies used fixed industrial cameras/camcorder to collect vibration videos of stay cables or built-in sensors in mobile devices to monitor dynamic responses of stay cables, based on which cable forces were estimated. This paper proposed a lightweight cable force measurement method based on smartphone, which can realize multi-project, multi-cable surface, multiperson and real-time monitoring of cable force in a visual vibration environment at any. The proposed method is more convenient, economical and efficient compared to previous studies
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