The ANSYS Secondary Development For The Finite Element Analysis Of Pre-stressed Reinforced Concrete Structure

With the rapid progress of our country's economy and people's living standard, the technology of bridge engineering has taken significant development and got a brand new situation. But, the equivalent beam model is not available the stress of the complicated structures in partial. Therefore, the three-dimensional model is put forward in which the pres-stress steel can be modeled. The more effective advice can be brought forward for the reinforced concrete structure's design and calculate. Many problems should be taken into consideration during the solution of bridge structures, including create steel model, calculate pre-stress loss, disposal of the bond between concrete and steel bar, equivalent loads and crack. In order to solve the above problems, the concrete structures and steel bars in FEA model are created separately; the parameters of steel shape are gained by the location of nodes and the radius of flexure curvature; the couple boundary conditions are used to simulate the bond of concrete and steel bar; the boundary load is calculated using statistic equivalent principle and the effective stress of steel bar is obtained by loss formula which is also simulated by temperature load. So, a module for local stress analysis of pre-stressed reinforcement concrete in bridge structures has been developed. Using the user-programming toolkits of ANSYS, Access, Visual C++ and Visual Fortran, It can be classified into three parts: preprocessing, calculating and post processing. In the preprocessing part the pre-stressed reinforcement concrete model is parametrically constructed, and the corresponding material base and the bond between concrete and steel bar are also developed. With the module both the pre-stress loss and the boundary load can be automatically calculated and the results are analyzed by the processor of ANSYS. Finally, it is shown from the example result, that the method is efficient.