What is it about?
Carbon fiber-reinforced plastic (CFRP) cables have numerous good characteristics, including high tensile strength, light weight, excellent fatigue resistance, and non-corrosiveness, so CFRP cables can be a good alternative to traditional steel cables in future applications. However, CFRP stay cables are possibly more prone to large amplitude vibrations under dynamic load because of their light weight and weak shear stiffness compared with steel cables. Hence, studying the dynamic properties of CFRP cables would be of great significance.
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Why is it important?
This paper investigates both the parametric vibrations and forced vibrations of CFRP stay cables subjected to periodic motions of supports. The nonlinear vibration equations of stay cables subjected to three directions of excitations are formulated, and an accurate nonlinear dynamic model for both in-plane vibrations and out-of plane vibrations of stay cables is proposed. Particularly, the excitations at both supports are considered in this model.
Perspectives
Essentially, the support excitations of stay cables originate from the vibrations of girders and towers because of the action of dynamic loads, such as wind, earthquakes, and environment vibrations. Hence, the stochastic pattern is a more general excitation pattern and many global vibration modes of cable stayed bridges will occur. However, only one of the typical global vertical bending vibration modes of cable stayed bridges is studied in this paper. Other modes of vibration will be studied in the future.
Sun Shengjiang
Chang'an University
Read the Original
This page is a summary of: Nonlinear vibrations of CFRP cables excited by periodic motions of supports in cable-stayed bridges, Journal of Vibration and Control, January 2018, SAGE Publications,
DOI: 10.1177/1077546317750503.
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