ABSTRACT
There are two major seismically disasters of cable-stayed bridges, large force of the pylon and excessive displacement of the girder. Floating cable-stayed bridges and tower-girder rigid fixity system, as two main types cable-stayed bridge would yield large force and excessive displacement of the girder respectively. Therefore, there is an agreement among many researchers that the main deck should neither be fixed to the pylon, but rather bellowed to experience some sort of relative movement at these locations, which would lead to a reduction in the overall forces transmitted between the superstructure and the substructure (Sharabash, 2009). The compromise is to install aseismic bearings between superstructure and substructure in floating cable-stayed bridges as additional stiffness to seek a balance in order to meet the limits of the girder displacement and seismic force at the tower bottom simultaneously.
