Abstract
Objective: to improve the method of determining the force in the cable stays by frequencies of natural transverse oscillations. Methods: synthesis and analysis of theoretical and experimental data, experimental methods for studying the structures. Results: in the paper, the problems of determining the tension forces of the cable stays by the frequencies of their natural oscillations are considered taking into account various factors (the design of anchor fastenings, the angle of inclination and sagging of the cable stay, the change of temperature). The estimation of possible errors in calculations is given. The degree of coincidence of the actual and design stress-strain state of the cable stays depends on the correctness of accounting the influence of the factors considered. The effect of the temperature change and the anchor fastening structure on the frequency of the natural oscillations of the cable stays has been experimentally tested. The recommendations on the determination of the forces in the cable stays by dynamic parameters are given. A method for controlling the tension forces of the cable stays and specialized software “Vant” (“Cable”) for automation of the measurement process are developed. The method has been tested on several bridge structures that have cable-stayed elements. Practical significance: the ability to use the developed method for controlling the tension forces of cable-stayed elements during the operation of artificial structures.
Highlights
cable stays and specialized software “Vant” (Cable) stays are the main supporting element in cable-stayed bridges
When determining the tension force of the cable stay, it is necessary to take into account the length of the anchors participating in joint oscillations with the cable stay
Significant https://doi.org/10.10 51/matecconf /201823905011 relative errors in determining the forces in the cable stays can be caused by temperature differences from the uneven heating of the elements, so it is recommended to carry out measurements in cloudy windless weather, and to record the temperature of the cable stay and the surrounding structures
Summary
Cable stays are the main supporting element in cable-stayed bridges. Typically, to ensure the design distribution of forces in the cable-stayed girder, pre-tension of cable stays is implemented during the installation. If in the course of operation, for some reason, the tension forces change, this leads to a change in the stress-strain state of the structure as a whole. The experience of monitoring unique cable-stayed and suspended foreign bridges is reflected in the study [1], which noted that the measurement of forces in cable-stayed elements can be carried out using accelerometers and magnetoelastic sensors. Generalized theoretical and experimental studies on the design and construction of cablestayed bridges, in particular, the features of static and dynamic operation of cable-stayed https://doi.org/10.10 51/matecconf /201823905011 elements; recommendations on accounting the stress-strain state of the cable stays in the areas of attachment to the anchors, and other information relating to cable-stayed bridges are collected in [2]
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