Design of Passive Control System for Seismically Excited Cable-Stayed Bridges

In this paper, the design procedure and guideline of LRB are proposed and the effectiveness of designed LRB is investigated for a seismically excited cable-stayed bridge. The design index (DI) and procedure of LRB for cable-stayed bridge are proposed and appropriate LRB is selected when the proposed DI value is minimized or converged for variation of properties of LRB. The design result shows that the damping and energy dissipation effect of LRB are more important than the shift of the natural period of structures for cable-stayed bridge. The control performance of designed LRB is also verified and the result shows that seismic responses of cable-stayed bridge are controlled sufficiently by LRB. Furthermore, the sensitivity analyses of properties of LRB are conducted for different characteristics of earthquake. The performance of designed LRB is not changed significantly and thus the robustness of designed LRB is verified for these. Finally the VD is designed and employed to obtain the additional reduction of seismic responses which are not reduced sufficiently by only LRB.