Rain-wind induced vibrations of cables stayed bridges

Numerical investigation of the coupled interaction between an unsteady aerodynamic flow field and a water film coating on a circular cylinder

“…Quantitatively this result is also in excellent agreement with results from experiments previously reported (Hikami and Shiraishi (1988);Flamand (1995); Gu and Du (2005); Zhan et al (2008)). If the cable geometries and orientations under which RWIV has previously been detected in these prior experiments are transformed into the present notation, as presented in Table 2.…”

“…Earlier work noted the frequency of these ripples being similar to the frequency at which an enhanced Karman Vortex arises due to interactions with the axial vortex Matsumoto et al, 2001). A moderate initial thickness of water is required for clear ripples to form, and it could be interpreted that this is consistent with full scale observations that "moderate" rainfall is required for RWIV to occur (Hikami and Shiraishi 1988). However, much more investigation is required before this can be accepted as a firm conclusion from these results.…”

“…First formally reported by Hikami and Shiraishi (1988), who recorded the strong influence of rain on large amplitude cable oscillations during the construction period for the Meikonishi Bridge. Since this event there have been numerous observations and investigations of RWIV.…”

“…Moderate rainfall is required (Hikami and Shiraishi 1988) though it is difficult to ascertain a consistent definition of "moderate" rain from the published research. Indeed many studies have not measured exact rainfall or water flow rates.…”

“…1, it can be said that RWIV typically occurs in cables which descend in the windward direction, at yaw angles between 20° ≤  ≤ 60° (Cosentino et al 2003;Flamand 1995), and at angles of inclination between 20° ≤  ≤ 45° (Hikami and Shiraishi 1988;Gu and Du 2005).…”