Simulation Analysis And Structure Optimization Of Simply Supported-continuous Beam Bridge

The simply-supported beam bridge is the earliest and the most widely used bridge type. Because of simple structured convenient in construction and can adapt to larger settlement of foundation, Thus it is widely applied in the small and medium-sized span bridge. As the increasing construction of the medium span bridge, adding the inherent advantages of simply-supported bridge, this kind of bridge received widespread popularity. The supported-continuous is the main method in the continuous girder construction process,which takes the shape of simply-supported at the beginning.,then poures the concrete in the pillar top and girder between transverse flange plate, when the pouring concrete meet the prescribed strength, conducting the system conversion forms a continuous beam system. The thesis combines the bridge along the Yellow River, some deep studies is done according to the bridge's simulation and transverse distribution calculation. Using finite element analysis software MIDAS/Civil to build the bridge structure model. Simulation the whole construction process, beam body section, prestressing tendons and temperature effect of the bridge.Then based on the field experiment research,the linetype matching with the stress changes of the simply-supported beam bridge is been analyed. At the same time the theoretical calculation of transverse distribution load method of supported-continuous girder bridge is studied, especially do the research load transverse distribution of the finite element analysis on simply-supported turn continuous system. Through the simulation of different section forms and different span combinations, receive different models of relevant theoretical data and compare them, finally sum up the simulation method of simply-supported turn continuous system.the paper study the structure stress and linear influence of simply-supported turn continuous girder bridge,which is built under different construction procedures.By building the FEA modle of bridge construction process, different dismantle order of the temporary rigid and the casting order of the continuous section is been researched, also the optimization scheme on stress and linear influence of the whole bridge is drawed. Also according to the site and past experience on reducing the prestressed loss, the practical engineering for the effective construction method is summarized.Finally, the paper summarize the suitable simulation method for simply-supported turn continuous system and the optimization of some practices,especially different type of bridge,and then make the prospect of the paper's deficiencies and pending further perfection.