Simulation And Test Research On Adaptive Bearing Control Technology Of Viaduct Floating Bridge For Deepwater Railway Bridge Rush Repair

With improvement of engineering technology in our country,more and more river-crossing and sea-crossing bridges have been built.These bridges are often regional traffic arteries and undertake heavy railway and road transportation tasks.Once such bridges are damaged due to disasters or wars,each day of extension of the repair period will bring great losses.Deep-water long-span bridges are often difficult to construct,and repairing such railway bridges is even more difficult.The construction of elevated floating bridges to repair them is the shortest construction period and the least negative impact of all current repair plans.Because elevated railway floating bridges will produce relatively large vibrations under the coupled effects of traffic load and hydrodynamics,it is of great significance to study the active vibration control technology of elevated floating bridges for emergency repairs in order to improve the speed and safety of traffic.The purpose of this paper is to study the active control of elevated floating bridge structures through hydraulic adaptive bearings.According to the actual working environment faced by the elevated floating bridge,three basic working conditions are determined when the support is placed on a fixed pier,a still water floating pier and a floating pier in a wave environment,and a flexible compensation is designed based on the state feedback in modern control theory And the active control system of wave heave compensation.In order to better study the active control system,an adaptive bearing test system based on floating foundation simulation is designed,and part of the design refers to the similar test theory.The system can simulate the buoyancy of the water body and the heave displacement of the floating foundation through the actions of the spring damper and the bottom hydraulic cylinder,and simulate the above three basic working conditions through the locking and opening of different mechanisms.Use ADAMS and MATLAB/Simulink to co-simulate the designed test system,adjust the control scheme and control parameters,and study the control effect of the hydraulic support;build a test system to further verify the hydraulic adaptive support in different working conditions through experiments Control effect.Both the simulation and test results show that the hydraulic adaptive support can effectively control the vibration of the floating bridge structure,compensate for the displacement of the beam end due to the flexibility of the foundation and the change of the water level,and help improve the performance of the elevated floating bridge for emergency repairs during actual work.Safety,passability,environmental adaptability and train speed.