COMPUTATIONAL FLUID DYNAMICS SIMULATION OF RAIN-WIND-INDUCED VIBRATION OF STAY CABLES
type: CreativeWork
description: Due to the large amplitude, frequent occurrence and severe consequences, the rain-wind induced vibration (RWIV) of stay cables in cable-stayed bridges has been investigated extensively by researchers around the world. However, the underlying excitation mechanism is still unclear. Recently, computational fluid dynamics (CFD) simulation has been widely applied in the research on structure vibrations due to dynamic wind loads, with great potential as an alternative tool for wind tunnel testing. It has also been adopted to investigate the RWIV, but only a few studies have been conducted so far. Furthermore, most of the CFD simulations reported in literatures are two-dimensional, and a circular cylinder has been widely adopted to represent the stay cables. Thus, only the wind flow normal to the stay cable axis has been taken into account. Such simplifications may be inappropriate, since some key factors are completely ignored, such as the wind flow parallel to the stay cable axis, the spatial orientation of stay cable, etc. Therefore, the CFD method has also been chosen in this dissertation, but with a new modeling approach-using a two-dimensional skewed elliptical cylinder to represent an inclined stay cable. Extensive simulations have been conducted for this case to investigate the role of the upper rivulet in the RWIV, by examining the related aerodynamic forces acting on the cable models. Two key parameters- airflow speed and the rivulet location have been focused on. The simulation results show that the upper rivulet may play an important role in the RWIV of stay cable. When the rivulet is located within a certain critical range, the aerodynamic force coefficients change significantly not only in amplitude but also in frequency. In particular, a kind of “beat” phenomenon has been extensively observed on the time histories of the aerodynamic force coefficients, especially on the drag coefficients. Some extremely low frequency components, which are in a magnitude of o…
abstract: Due to the large amplitude, frequent occurrence and severe consequences, the rain-wind induced vibration (RWIV) of stay cables in cable-stayed bridges has been investigated extensively by researchers around the world. However, the underlying excitation mechanism is still unclear. Recently, computational fluid dynamics (CFD) simulation has been widely applied in the research on structure vibrations due to dynamic wind loads, with great potential as an alternative tool for wind tunnel testing. It has also been adopted to investigate the RWIV, but only a few studies have been conducted so far. Furthermore, most of the CFD simulations reported in literatures are two-dimensional, and a circular cylinder has been widely adopted to represent the stay cables. Thus, only the wind flow normal to the stay cable axis has been taken into account. Such simplifications may be inappropriate, since some key factors are completely ignored, such as the wind flow parallel to the stay cable axis, the spatial orientation of stay cable, etc. Therefore, the CFD method has also been chosen in this dissertation, but with a new modeling approach-using a two-dimensional skewed elliptical cylinder to represent an inclined stay cable. Extensive simulations have been conducted for this case to investigate the role of the upper rivulet in the RWIV, by examining the related aerodynamic forces acting on the cable models. Two key parameters- airflow speed and the rivulet location have been focused on. The simulation results show that the upper rivulet may play an important role in the RWIV of stay cable. When the rivulet is located within a certain critical range, the aerodynamic force coefficients change significantly not only in amplitude but also in frequency. In particular, a kind of “beat” phenomenon has been extensively observed on the time histories of the aerodynamic force coefficients, especially on the drag coefficients. Some extremely low frequency components, which are in a magnitude of o…
author: WANG, HONGFAN
keywords: Rain-Wind-Induced Vibration, CFD Simulation, Cable Vibration, Cable-stayed Bridge, Civil Engineering, Structural Engineering
date published: 2020-01-01T08:00:00Z
date modified: 2026-07-24T01:57:21Z
provider: City University of New York - City College
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: City University of New York - City College