Intelligent Hybrid Control for Braking-Induced Longitudinal Vibration Response of Floating-Type Railway Cable-Stayed Bridge

摘要

Large longitudinal vibration response in deck of floating-type railway cable-stayed bridge will be induced by earthquakes,train braking and traffic,consequently the response can lead to huge bending moments at the bottom of the towers,which may produce serious adverse effect on the regular service and safety.In order to avoid it,conventional control devices such as fluid dampers are used to suppress the longitudinal seismic response of the deck.But they can not effectively mitigate longitudinal vibration response caused by train braking and traffic.In the paper,the longitudinal intelligent hybrid control system for the braking-induced longitudinal vibration response of deck of floating-type cable-stayed bridge with MR dampers and fluid dampers are proposed,which are applied to the design of Tian Xingzhou Bridge in China,the longest highway and railway combined cable-stayed bridge in the world.Simulation result shows that the longitudinal displacement of the deck and the bending moments at the bottom of the towers can be obviously mitigated under the braking excited,and the design requirements of the bridge is satisfied.