Model Test on Vehicle-Bridge Couped Vibration for the Long-span Bridge with High-pier
|Course||Bridge and Tunnel Engineering|
|Keywords||Bridge Coupling Vibration Model test Continuous Beam Bridge Continuous Rigid Frame Bridge Finite element model updating|
With the rapid development of China's road transport undertakings - span continuous beam bridge and continuous rigid frame bridge in China has been widely used, especially in the western gully region, this bridge type spanning capacity and better economy, tend to become the preferred solution. For bridge Coupled Vibration problems of this type of bridge is used mainly actual bridge test and the finite element method to study, model test method, however, the high pier of the highway span bridge the axle coupling effects research rarely. Has a view of the model test, the economy is good, targeted, accurate data characteristics, it is necessary to study axle coupled vibration model test method. Bridge Coupled Vibration bridge Coupled Vibration Model Test \analysis and exploration adhere to the combination of theory and practice. Span rigid frame of a high pier - continuous beam combination system bridge is a real bridge similar principle and dimensionless analysis as the basis to determine the model design must follow similar guidelines and based on the model of the bridge and the actual bridge static and dynamic The relationship between the design of the 1/20 scale model of the bridge, while the design of the model bridge static and dynamic test program. The the axle coupling test characteristics according to the model of the bridge, using the finite element method to analyze the model bridge, the main analysis: model car stationary at different locations of the model bridge to bridge frequency; positioning the disturbance force acting to get off the bridge Coupled Vibration System response; model car at different speeds through the model bridge bridge coupling vibration system response. Both in the laboratory model bridge static test, the test of the control section deflection and strain. Different locations the dynamic testing test model bridge vibration frequencies, mode shapes, damping ratio and dynamic characteristics, and test model car stationary on the model bridge bridge frequency and positioning disturbance force to get off the bridge coupled vibration system response . Finite element numerical analysis of the results and the actual results of the bridge when the bridge coupling vibration frequency change. To make the finite element model with the actual model better combined analysis using ANSYS optimization, and finite element model updating based on the measured values ??axle coupling, using both static load test measured deflection as state variables, and the measured frequency of the dynamic test construct the objective function of the finite element model of the bridge Coupled Vibration correction.