SEMIACTIVE DAMPING OF CABLES WITH SAG

摘要

Stay cables, such as are used in cable-stayed bridges, are prone to vibration due to their low inherent damping characteristics. Transversely-attached passive viscous dampers have been implemented in many bridges to dampen such vibration. However, it can be shown that only minimal damping can be added if the attachment point is close to the deck. For longer bridge cables, passive damping is insufficient. A recent study by the authors demonstrated that "smart" semiactive damping can provide significantly superior supplemental damping. This paper extends the previous work by adding sag, inclination, and axial flexibility to the cable model. The equations of motion are given. Passive, active, and smart dampers are incorporated into the model. Cable response is seen to be dramatically reduced by semiactive dampers for the range of sag typical in cable-stayed bridges and for larger sag.