Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Wind and Structures Volume 6, Number 6, November 2003 , pages 485-498 DOI: https://doi.org/10.12989/was.2003.6.6.485 |
|
|
|
Rain-wind induced vibration of inclined stay cables. Part II: Mechanical modeling and parameter characterisation |
||
Nicola Cosentino, Olivier Flamand and Claudio Ceccoli
|
||
| Abstract | ||
| This paper presents a mechanical model of Rain-Wind Induced Vibration (RWIV) of stay cables. It is based on the physical interpretation of the phenomenon as given in Cosentino, et al. (2003, referred as Part I). The model takes into account all the main forces acting on cable, on the upper water rivulet (responsible of the excitation) and the cable-rivulet interaction. It is a simplified (cable crosssectional and deterministic) representation of the actual (stochastic and three-dimensional) phenomenon. The cable is represented by its cross section and it is subjected to mechanical and aerodynamic (considering the rivulet influence) forces. The rivulet is supposed to oscillate along the cable circumference and it is subjected to inertial and gravity forces, pressure gradients and air-water-cable frictions. The model parameters are calibrated by fitting with experimental results. In order to validate the proposed model and its physical basis, different conditions (wind speed and direction, cable frequency, etc.) have been numerically investigated. The results, which are in very good agreement with the RWIV field observations, confirm the validity of the method and its engineering applicability (to evaluate the RWIV sensitivity of new stays or to retrofit the existing ones). Nevertheless, the practical use of the model probably requires a more accurate calibration of some parameters through new and specifically oriented wind tunnel tests. | ||
| Key Words | ||
| wind induced vibrations; rain; cable dynamics; water rivulet; bridges. | ||
| Address | ||
| Nicola Cosentino; DISTART, University of Bologna, Via Risorgimento 2, 40136 Bologna, ItalyrnOlivier Flamand; Centre Scientifique et Technique du B?timent, 11 rue Henri Picherit, 44000 Nantes, FrancernClaudio Ceccoli; DISTART, University of Bologna, Via Risorgimento 2, 40136 Bologna, Italy | ||