Analysis of wind-induced vibrations of an anchor cable using a simplified fluid-structure interaction method

摘要

Wind-induced vibrations of a pre-stressed aramid anchor cable using a simplified fluid-structure interaction (FSI) method are presented in the paper. Navier-Stokes equations for incompressible flow are solved in nine two-dimensional transverse planes located perpendicularly to the longitudinal axis of the cable. Based on in situ measured wind records statistical and spectral characteristics of the simulated turbulent wind fields were assigned to the investigated cable. The Shinozuka-Deodatis method is used to generate wind velocity histories. Spatially correlated wind velocity components in the longitudinal and lateral direction were considered as an inflow condition in nine created parallel plane fluid flow models. In order to generate an appropriate computational fluid dynamics model (CFD) of sufficient accuracy the verification and validation of the most critical issues were performed. The turbulent hybrid Spalart-Allmaras Detached Eddy Simulation (SA-DES) model was assumed accurate enough and applied in the plane fluid flow models of the dynamic analyses. The finite element method is applied to simulate the aeroelastic behaviour of the cable subjected to turbulent wind effects. Aeroelastic response characterised by wind velocity fields and vortex-shedding phenomena around the cross-section of the cable are presented. Results obtained from the simplified FSI analysis were used for the calculation of the Rayleigh Beta damping coefficient and applied in the nonlinear dynamic analysis of the anchor cable (CSD model). Responses obtained by FSI and CSD models are compared. (C) 2015 Elsevier Inc. All rights reserved.