Abstract
It is well known that the longitudinal motion of girder plays an important role in the seismic response behavior of long span cable-stayed bridges with longitudinally free or elastic support conditions. Therefore, it is needed to know the dynamic responses to seismic loads of this type of cable-stayed bridges from the initial stage of design. In this paper, a simplified method for estimating longitudinal seismic responses of long span steel cable-stayed bridges is presented from the practical standpoint. Numerical examples are also worked out to demonstrate the efficiency of the proposed method.
