Analysis On Track-bridge Interaction Of Steel Tied-arch Bridge On High-speed Railway

The scale of China's high-speed railway has been continuously developed and expanded.The steel tied-arch bridge is a common type of high-speed line with its unique structure and force characteristics.Compared with the ordinary railway,the speed of high-speed railway is greatly improved,and the requirement of the bridge's ride comfort is greatly improved.The interaction between the bridge and the track structure is an important factor affecting the safety.So study on the regularity of interaction between the bridge and the track structure,grasp the deformation characteristics of bridge and track structure and the vulnerable parts,so as to determine the monitoring parameters and the location of the sensor in the bridge health monitoring system for scientific structure safety monitoring and accurate maintenance is very important.This paper analyzed the steel tied-arch bridge and the track structure of CRTS ? type slab,based on practical engineering.Use a large finite element software ANSYS to establish an integrated entity model of steel tied-arch bridge and the track structure with "composite beam theory".Analyzed the influence of track structure for self-vibration characteristics by comparing the first five-order vibration characteristics of the bridge model with track structure and without track structure.The track-bridge interaction of the model was analyzed with the temperature load and different line train loads,studied and compared something under different conditions,for example: the vertical deformation law of steel box girder,rail and track slab longitudinal relative displacement,components of track structure relative vertical and longitudinal displacement,the longitudinal stress of the track structure of each layer.the law of rail longitudinal stress the longitudinal displacement.Analyzed the law of the force and deformation about components of track structure in the track-bridge interaction of steel tied-arch bridge,determine the most unfavorable conditions,the position of concrete and CA mortar layer easy happening escapes and crack,the position of track plate and base plate easy to crack.When install the health monitoring system for this bridge,This article can provide services for find a reasonable layout of sensor and post-repair of the bridge track structures.