| With this new composite material of concrete filled steel tube is widely used in bridge engineering, breaks the bridge problem in the strength of materials and construction technology, the rapid development of the concrete filled steel tube arch bridge. At present, our country has built a lot of CFST arch bridge, in terms of its application, has been in a leading position in the world. However, the study on its theory is not perfect, for the static characteristics of mature, but relatively backward in dynamic characteristics. Because the steel pipe concrete arch bridge in bridge structure andmaterial and other traditional arch bridge is significantly different, the have their own characteristics in dynamic and static characteristics. Based on the theory of vehicle bridge coupling vibration and some software combination, to Inner Mongolia and theheat made supported through steel pipe concrete arch bridge dynamic response analysis, and study the bridge impact coefficient. The main contents shown below:1) Describes the development status of the concrete-filled steel tube arch bridge, and the present stage national scholars on the dynamic characteristics of concrete filled steel tubular arch bridge and the vehicle bridge coupling vibration theory research achievements and unsolved problems.2) Method to establish the model of vehicle engineering background and vehicle bridge coupling vibration problem and hrmt bridge is introduced in, and by using the large finite element software Ansys, analysis model of the bridge was established by using beam grillage method; according to the (d’Alembert) was established based on the principle of vehicle1/4,1/2and space vehicle model, and just the stiffness matrix of each vehicle model, mass matrix and damping matrix.3) According to Chinese standard GB7031-86"Pavement Roughness said vehicle vibration input method", based on our standard of power spectral density function using the Matlab simulation of the A, B, C, D four levels of road pavement irregularity degree sample curve.4) Describes the research methodology coupled vibration problem, the use of displacement compatibility and interaction to establish the relationship between axle coupled vibration system model. Summary solving numerical solution coupled vibration system, according to Newmark-β method, using Matlab prepared to solve the problem and verify the correctness of the program.5) On the wooden bridge and thermal vibration characteristics were analyzed, and extract its first ten modes. From the outside diameter of the arch rib and stiffness; layout and wind bracing stiffness analysis of the number and location of the natural vibration frequency of the variation of the bridge.6) On the wooden bridge and thermal systems be coupled vibration typical analysis, the impact of its power characteristics. From vehicle speed, road grade, bridge damping ratio, control and lane-sectional analysis of these aspects discussed variation of its dynamic response. Give the definition of the impact factor, and from the vehicle speed, road grade and bridge damping ratio analysis and discussion of these aspects impact coefficient variation of the deck. According to the formula given in the specification countries bridge the impact factor calculation, the impact factor calculation and thermal wooden bridge, and compare the results of this article do. The results of this paper, the vibration characteristics of coupled vibration and dynamic response of concrete filled steel arch bridge provides numerical basis for the promotion of simulation calculation formula suitable for CFST Arch impact factor, played valuable role. |
