The Experimental Investigation On The Model Of Long-span Prestressed Concrete Continuous Rigid-frame Bridges With High Pier

Now, one of the popular bridge types is Long-span Prestressed Concrete Continuous Rigid-frame Bridges with High Pier, combined with continuous beams and rigid frame features, which is simple and smooth. As a bridge structural system widely used, the study-is more practical and significant. The construction of such bridge usually use cantilever, which is a complex nonlinear process, troubling the design and construction of these bridge. This analysis based on the project of the model test of Long-span Prestressed Concrete Continuous Rigid-frame Bridges with High Pier in the Xi'an Highway Institute of the Shaanxi province. To ensure the capable of forming linear and the structure in the construction of the ideal linear form, taking a structural model test system is a good way to solve these problems. At present, owing to the present diseases of continuous rigid frame, the study is particularly important. But, because the second dead load of constant high-speed rail in the construction is larger and larger, it is more important to ensure the reasonable construction time of the second dead load. And it is important that how to choise the proper closure and the construction time of the second dead load.The main contents of this article is:First, explain the model test theory based on the similar theory. Derive the similar criterion of the stress, strain, deflection in the model and the prototype, under the concentrated load, uniformly distributed load and bending moment. Design the model based on the project, determine the model of section. Manufacture the model, considering the prototype of the boundary conditions.Second, enalysis the stress and displacement of the structure under different conditions, by establishing the whole process numerical simulation model which based on the finite displacement method, considering the nonlinear characteristics of this bridge construction.Third, compared to experimental data on the model error analysis, compared numerical model results with the measured data, to establish a more accurate numerical model. Verify the design theory of computation and the reasonable of the software.Fourth, by the model test and numerical calculation, study the mechanical behavior and mechanical properties of the Long-span Prestressed Concrete Continuous Rigid-frame Bridges with High Pier, analyse the linear variation of the bridge and structure of the overall performance, and get the reasonable closure in the construction of the program for the desired linear and the coordination of force. By the analysis of the influential factors of the closure, give the relevant recommendations of the closure and thoroughly analyse the impact of the second dead load on the bridge after closure.