A stochastic approach to cable dynamics with moving rivulets |
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Authors: | DQ Cao C Wang |
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Institution: | Department of Physics, Lancaster University, Lancaster LA1 4YB, UK |
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Abstract: | This article constructs a stochastic model for the response of stay cables of cable-stayed bridges to the combined effect of wind and rain. It describes a spring-mounted section model of a stay cable in a steady wind where aerodynamic forces are modified by the dynamics of a mobile liquid rivulet. The motion of the rivulet is described by a simple stochastic process that, together with aerodynamic forces, models the complex fluid-structure interaction. Based on measured data for drag and lift coefficients and a static rivulet location, an analysis of the model suggests a new stochastic excitation mechanism for the rain-wind induced vibrations of stay cables. |
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