Centrifugal Force Reduction Method for High Speed Railway Simply Supported Beam Based on Bridge Response
To analyze the theoretical basis for the vertical live load reduction coefficient in the centrifugal force calculation formula,a spatial model of the train-curved bridge-pier system was established for vehicle bridge coupling vibration simulation calculation.It was proposed that the vertical live load reduction coefficient can be calculated using the ratio of bridge dynamic response to static response produced by design centrifugal force.The influence of factors such as train speed,bridge pier height,span,and curve radius on the reduction coefficient was analyzed by combining backpropagation neural network.The results show that vehicle speed has the greatest impact on the reduction coefficient,followed by bridge span.The vertical live load reduction coefficient reflects the difference between the designed live load and the operating train axle load in the train load diagram,and the reduction coefficient should match the train load diagram and the actual operating train.The vertical live load reduction coefficient formula in the current specifications has good adaptability to the ZK load of China high speed railway and can meet the requirements of centrifugal force design for simply supported beams of high speed railways.
万方数据
维普
