Abstract
Dynamic testing can complement the monitoring of tie rod tension by means of sensors. In one example, a customer with doubts about the results of his 20-year-old instrumentation requested verification of the tension measured with dynamic testing.
You have full access to this open access chapter, Download chapter PDF
12.1 Example
A railway company has implemented a tension monitoring of 4 tie rods stabilizing an embankment. This monitoring has been done with load cells for more than 25 years.
One cell shows that the force decreases and the other three show that the tension force remains constant.
The concessionaire requested a non-destructive test, which we performed. The question concerned cell 1, which has a questionable behavior (Figs. 12.1 and 12.2).
From the dynamic tests, we calculated the dynamic stiffness of the tie rods.
Tie Rod 1 7,31E + 8 N/mTie Rod 2 7,03E + 8 N/m.
Tie Rod 3 6,58E + 8 N/m Tie Rod 4 6,19E + 8 N/m.
This leads to the following graph (Fig. 12.3).
Using the equation from the diagram in the previous figure it is possible to calculate the real tension force of tie rod 1 which is 473 kN (Fig. 12.4).
The results of the non-destructive tests show the reliability of the method and the different uses that can be made of it.
12.2 Load Cells
The cells used in the example in the previous chapter are ring cells that have been in service for over 25 years (Fig. 12.5).
The vibrating strings are used to know the value of the tension in different points of the same tie to know its operation.
To obtain the results it is necessary to excite the vibrating string with an electric current so that the vibrating string gives a vibratory response in relation to the tension force (Fig. 12.6).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Open Access This chapter is licensed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.
The images or other third party material in this chapter are included in the chapter's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the chapter's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
Copyright information
© 2024 The Author(s)
About this chapter
Cite this chapter
Rincent, JJ.H. (2024). Load Cells. In: Ground Anchors. Springer, Singapore. https://doi.org/10.1007/978-981-97-4414-5_12
Download citation
DOI: https://doi.org/10.1007/978-981-97-4414-5_12
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-97-4413-8
Online ISBN: 978-981-97-4414-5
eBook Packages: EngineeringEngineering (R0)