Modeling of cable vibration effects of cable-stayed bridges
S.H. Cheng and David T. Lau
Department of Civil and Environmental Engineering, Carleton University,
Ottawa, Ontario, Canada
Abstract: The analysis of dynamic responses of cable-stayed bridges
subjected to wind and earthquake loads generally considers only the motions of
the bridge deck and pylons. The influence of the stay cable vibration on the
responses of the bridge is either ignored or considered by approximate
procedures. The transverse vibration of the stay cables, which can be
significant in some cases, are usually neglected in previous research. In the
present study, a new three-node cable element has been developed to model the
transverse motions of the cables. The interactions between the cable behavior
and the other parts of the bridge superstructure are considered by the concept
of dynamic stiffness. The nonlinear effect of the cable caused by its
self-weight is included in the formulation. Numerical examples are presented to
demonstrate the accuracy and efficiency of the proposed model. The impact of
cable vibration behavior on the dynamic characteristics of cable-stayed bridges
is discussed.
Keywords: cable-stayed bridges; cable vibration; dynamics; finite
elements; long-span structures
