Abstract
The dynamic behavior of a multitower cable-stayed bridge with the application of partially longitudinal constraint system using viscous fluid dampers under real earthquake ground motions is presented. The study is based on the dynamic finite element model of the Jiashao Bridge, a six-tower cable-stayed bridge in China. The prime aim of the study is to investigate the effectiveness of viscous fluid dampers on the longitudinal seismic responses of the bridge and put forth a multiobjective optimization design method to determine the optimized parameters of the viscous fluid dampers. The results of the investigations show that the control objective of the multitower cable-stayed bridge with the partially longitudinal constraint system is to yield maximum reductions in the base forces of bridge towers longitudinally restricted with the bridge deck, with slight increases in the base forces of bridge towers longitudinally unrestricted with the bridge deck. To this end, a multiobjective optimization design method that uses a nondominating sort genetic algorithm II (NSGA-II) is used to optimize parameters of the viscous fluid dampers. The effectiveness of the proposed optimization design method is demonstrated for the multitower cable-stayed bridge with the partially longitudinal constraint system, which reveals that a design engineer can choose a set of proper parameters of the viscous fluid dampers from Pareto optimal fronts that can satisfy the desired performance requirements.
Highlights
For long-span cable-stayed bridges, the multitower cablestayed bridges with three or more towers have been a recent design trend [1]
The analytical investigations for the seismic control of the multitower cable-stayed bridge with the partially longitudinal constraint system using viscous fluid dampers indicate that the large base shears and moments of bridge towers longitudinally restricted with the bridge deck are significantly reduced, with significant increases in the base shears and moments of bridge towers longitudinally unrestricted with the bridge deck
In the case of seismic control of the multitower cable-stayed bridge with the partially longitudinal constraint system, a trade-off exists between the base forces of bridge towers longitudinally restricted with the bridge deck and base forces of bridge towers longitudinally unrestricted with the bridge deck as mentioned previously
Summary
For long-span cable-stayed bridges, the multitower cablestayed bridges with three or more towers have been a recent design trend [1]. Typical examples of this bridge type are the Millau Viaduct Bridge in France, the Maracaibo Bridge in Venezuela, the Rion-Antirion Bridge in Greece, the Mezcala Bridge in Mexico, the Dongting Lake Bridge in China, and the Ting Kau Bridge in Hong Kong [1]. Compared with a conventional threespan cable-stayed bridge with two towers, large temperatureinduced deformation in the long bridge deck is one of the major problems in the design of multitower cable-stayed bridges. The application of the partially longitudinal constraint system can improve the static performance of the multitower cable-stayed bridge under temperature action. It is especially desirable to provide a seismic control scheme for the multitower cable-stayed bridge using partially longitudinal constraint system
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