Based On Secondary Development Of Ansys Fill Fanggong Han Mechanical Property Analysis

There are obvious deficiencies in the current'Specifications for Design of Masonry and Concrete High Bridges and Clverts'about the high fill culverts calculation. In the design of high fill culverts, how to make a convenient and fast force analysis for high fill culverts, taking in to consideration of various factors which affecting the earth pressure, is becoming more and more important.With the help of secondary development function of ANSYS12.0 platform, we developed a module program for force analysis of high fill culverts. Using UIDL to design user interface,establish eyeable dialog box,which realizes the input of parameters and APDL to realize modification of parameters and embedment of module,which makes the modules be a part of ANSYS. The system can decrease much repetitive work in process of analysis after the secondary development,only to input different parameters and select different models that can complete analysis. Using the model program developed by secondary development, we performed a calculation for an arch culvert of a high way in problem. The reason causing the cracking problem was analyzed, the factors affecting arch ring pressure was calculated, as well as its action regulation and effect extent, the main results of research are as follows:1. Both the width and slope of gully play an important role in determining the stress of culvert。The wider the gully, the steeper the slope of gully is, that is, the narrower gully can have more remarkable influence on cutting down stress of culvert.2. The width and depth of ground treatment make relatively great effect on the earth pressure over the vault, it is reasonable for the ground treatment to go beyond the foundation a certain scale, vertical earth pressure gradually increases as the depth of foundation goes deeper.3. The effect of the Poisson'ratio of backfill on arch ring is unnegligible, it is often better to chose backfill with small Poisson' ratio. Modulus of backfill hardly affect the stress of arch ring.4. The influence of ground stiffness on the tensile stress of the upper limp of the arch culvert foundation is notable, the larger the modulus, the small the tensile stress is.5. A tiny dislocation of skewback would result in big additional stress of the main arch. The stress increase gradually, which is more prominent when induced by horizontal displacement of skewback, as the dislocation of the skewback increase.6. The thickness of the arch ring and the thickness of the culvert pier would impact the force state of the arch ring. Once the dimension of the arch ring and the culvert pier reach to a certain point, the whole section pf the arch ring will bear force, which is good for concrete structures, because the beard force is far less than the designed Compressive strength.