Results of determination the logarithmic decrement of vibrations for parallel strand cables before and after installation of dampers
https://doi.org/10.52170/1815-9265_2024_71_74
Abstract
Cable-stayed bridges are one of the most complex structures in design, construction and maintenance. The cable is flexible load–bearing steel element with a low level of structural damping. Cable vibrations with significant amplitude can cause fatigue damage to the cables, which reduces the safety and reliability of the structure. Hydraulic dampers are an effective way of damping cable vibrations.
The article presents the experience of development, installation and testing of the first national cable-stayed system STS with parallel seven-wire strands on the bridge over the Oka River on the M-12 highway in Murom.
The purpose of the research is the experimental verification of the methodology of hydraulic dampers characteristics determination to achieve the required logarithmic decrement of cable vibrations after their installation. The author does not consider the methodology of theoretical calculation of the characteristics of dampers in this research.
A test program has been developed to achieve this goal. The selected method of vibration diagnostics for dynamic tests of cables is applicable to verify the logarithmic decrements of cables with dampers. The dependence of the values of the logarithmic decrement of vibration on the amplitude of vibration is revealed. The operability of the damper installations has been proved for all tested cables.
The values of the logarithmic decrement of the vibrations of the cables before the installation of the dampers are in the range from 0.5 to 3.0 %. After installation of the dampers, the values of the logarithmic decrement of vibrations ranged from 5.45 to 11.85 %, which is more than the minimum required value of 5 %.
The actual values of the logarithmic decrement of parallel strands cables, rare for the construction of cable-stayed bridges and valuable from a scientific point of view, were obtained on the same cables before and after the installation of dampers under the same constant loads on the superstructure.
About the Authors
V. S. Goryachkin
STS
Russian Federation
Russian Federation
Vladislav S. Goryachkin, Head of the calculation group
Moscow
M. S. Marchenko
STS
Russian Federation
Russian Federation
Maxim S. Marchenko, Technical Director
Moscow
V. R. Kamaltdinov
STS
Russian Federation
Russian Federation
Vladimir R. Kamaltdinov, Leading Specialist in the calculation of building structures
Moscow
M. A. Antonov
STS
Russian Federation
Russian Federation
Maxim A. Antonov, Structural analysis engineer
Moscow
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Review
For citations:
Goryachkin V.S., Marchenko M.S., Kamaltdinov V.R., Antonov M.A. Results of determination the logarithmic decrement of vibrations for parallel strand cables before and after installation of dampers. Bulletin of Siberian State University of Transport. 2024;(4):74-81. (In Russ.) https://doi.org/10.52170/1815-9265_2024_71_74
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