Spatial Dynamic Characteristics Analysis Of A&Long-span Continuous Rigid Frame Bridge On Basis Of A Parameterized Calculation Model

With the rapid development of China’s transportation, the high pier long-span continuous rigid frame bridge, having advantages of long-span capacity, reasonable force distribution and convenient construction, is widely applied in the modern bridge engineering. In recent years, with the increasing level of highway and railway, the span of a continuous rigid frame bridge is becoming longer, the pier is becoming higher, its structure is also more flexible, which lead to its dynamic problem is very prominent, so the spatial dynamic behavior of high pier and long-span continuous rigid frame bridge research is necessary, which also has very important meaning.1. The development history and research actuality of continuous rigid frame bridge review, theoretical calculation and analysis of dynamic characteristics and overview of current research on the bridge dynamic, understand the development status of the updated finite element model, provide a theoretical basis for the dynamic analysis of continuous rigid frame bridge with the subsequent.2. This paper introduces the main functions and characteristics of large-scale general software ANSYS, and take Maguohe bridge as an example, using ANSYS to establish the parameterized finite element model, for subsequent parametric finite element model updating optimization provides analysis basis.3. The basic principles of finite element correction and process are introduced, and the bridge static and dynamic load test of Maguohe bridge are analyzed, then the optimization algorithm of ANSYS is used to modify the finite element model of Maguohe bridge on the basis of the previous two, and compared the results before and after correction, the validity of the finite element model is reasonable and practical.4. Taking Maguohe bridge as the engineering background, and on the basis of the modified finite element model, effect from girder stiffness, pier stiffness and the expansion joint stiffness on the dynamic characteristics of the continuous rigid frame bridge is discussed.