Viscous Dampers for High-Rise Buildings

Abstract eng:
Viscous dampers (VD), when used in high-rise buildings in seismic areas, should reduce the vibrations induced by both strong winds and earthquakes. The optimal behaviour in these two situations is not usually the same, thus the design requirement for VD is often that they should have two different behaviours in the different range of velocities corresponding to wind and earthquake. Recently VD have been applied in three high-rise buildings in Asia, the Taipei 101 in Taipei, Taiwan, and the twin St. Francis Shangri-La Towers in Manila, Philippines. Taipei 101 has been the world’s tallest building since 2004 (508m). In this building 8 VD are used to control the motion of the Tuned Mass Damper (TMD) installed at its top. Said TMD has already been put into operation by earthquakes in March 2005 and May 2008 and by many strong typhoons. The St Francis Shangri-La Place is a residential development composed by two towers, each rising to 213m. In this case, 32 VD are installed into the towers structure according to an Arup newly developed and patented configuration. This paper describes the technology of VD installed in said high-rise buildings, and the results of the wide laboratory testing campaign aimed at verifying their behaviour during both wind storms and earthquake.

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