Bridges - Wind Loading of Structures - page 307

Figure 12.11 Vibration mitigation cable ties
used on the Tatara Bridge.
a function of transferring vibration energy from a vibrating cable to its neighbours. By
use of 'soft' cross-ties, energy could also be dissipated in the cross-ties, making this
system more effective.
Energy dissipation can also be provided by auxiliary damping devices mounted
between the cable and the bridge girder, near the connection points. This solution is more
expensive than the cross-tie method, but more aesthetically pleasing. Oil dampers and
viscoelastic dampers (Section 9.9.2) have been used for this purpose.
12.6 Case studies
The literature on the aerodynamics of long-span bridges is extensive, and many papers on
the subject contain references to particular bridges for illustration purposes. Sections
12.3.1 and 12.5 contain several examples in relation to vortex-shedding induced
vibrations and cable vibrations, respectively. Holmes (1999) has described the application
of the equivalent static load method (Section 12.3.4) to generate design loadings for the
Baram River (Malaysia) cable-stayed bridge.
The extensive wind engineering studies carried out for the current (2006) first and
second longest bridges in the world are described by Miyata et al. (1992) for the
AkashiKaikyo Bridge and by Reinhold et al. (1992) and Larsen and Jacobsen (1992) for
the Great Belt East Bridge (Denmark). The wind design of the Normandie Bridge from
the designer's point of view is well covered by Virlogeux (1992).