Study On The Eccentricity Magnifier Of Reinforced Concrete Arch Bridge

Reinforced concrete arch structure as a special kind of beam-columns, but the existing "road of Reinforced Concrete and Prestressed Concrete Bridge Design Code" JTG D62-2004 did not make a special note about calculation method about increasing eccentricity coefficient of eccentric arch structure. The capacity of reinforced concrete arch bridge are still carrying eccentric components to check, the eccentricity increased coefficient is an important parameter in capacity analysis of reinforced concrete arch ribs, it is necessary to take in-depth study on eccentricity increased coefficient of arch rib, under the framework of existing norms, making the force of reinforced concrete arch more precise, and the design more reasonable.In this paper, introduction of reinforced concrete arch of second-order effect analysis methods and moment magnifier method, based on the deflection arch described the theory of geometric nonlinearity and material nonlinearity of the reinforced concrete, make a simulation analysis of arch numerical. Consider the material nonlinearity, geometric nonlinearity and double the impact of non-linear, with software ANSYS to the spans of 50m, 70m and 90m of reinforced concrete arch bridge in different sections, different rise-to-span ratio, different the loading of different factors, calculate the theoretical values of the eccentric magnifier with the existing concrete Code and the Code of the old were compared, summarize the eccentric magnifier coefficient of influencing factors, as well as general laws, in order to increase the coefficient of eccentric arch further study to provide some reference. Finally article works through the practical example of the arch of the eccentric magnifier to do an analysis.