Research of the temperature effects on strain response in the steel-truss arch railway bridge using FIR filtering

摘要

The train-induced dynamic strain response is one of the most important indexes in the design and maintenance of the long-span steel-truss arch railway bridge. The strain Influence Line (IL) is used to characterize the vehicle-induced strain response of bridge member. This study investigates the temperature effects on ILs of strain response due to high-speed trains in various bridge structural members from two foci. Firstly, a Finite Impulse Response (FIR) filter is implemented to obtain the strain IL for the response of various structural members of the Dashengguan Yangtze River Bridge using data from strain sensors that are a part of the bridge Structural Health Monitoring (SHM) system. Secondly, the relations between the strain ILs and temperature (over the range of 10-50°C) are obtained for various members using regression, and the effects of temperature on the strain ILs are studied. The analysis reveals the following: The effect of temperature on the ILs of each member in the subject bridge can be described by polynomials.