Ultimate Bearing Capacity Study And Non-linear Factors Influence Analysis Of Long-Span Continuous Steel Truss Beam Arch Bridge

This thesis mainly studies the ultimate bearing capacity and analyses the influence of non-linear factors on long-span steel trussed arch bridges. Mainly work is done as follow:1. The theoretical knowledge which analyzing the problem needs for is introduced comprehensively. Including the theory about stability of the structure, the theory about calculation the non-linear factors of materials and geometry which can be used in calculating the long-span bridges, the theory about research methods of studying the ultimate bearing capacity of bridges and so on.2. The background for engineering studying is Nanjing Dashengguan Bridge. Finite-element software ANSYS is used for analyzing the bridge. Firstly, the ultimate bearing capacity of the Nanjing Dashengguan Bridge is ascertained in below three circumstances: linear elastic, considering the geometric non-linear only, considering the geometry and materials dual non-linear. Then make a detailed comparison of three cases, drawn the ultimate bearing capacity of steel trussed arch bridge be subjected to non-linear factors. Secondly, the ultimate bearing capacity of the Nanjing Dashengguan Bridge is also ascertained in the cases of different wind speed which as different horizontal wind loads act on bridge. Making a detailed comparison of different cases too, concluding influence of horizontal wind loads on the ultimate bearing capacity of the bridge structure. So the right ultimate bearing capacity of the bridge structure can be obtain, it provides a scientific basis for limited-designing. The structure's form of damage can be know clearly, also the structure's security reserve under the certain load or the capacity of overload also can be know accurately . All these can provide a basis and protection in construction, operation, safety management of the bridge structure.3. The general load and ultimate load acting on the bridge are analyzed, then the internal forces and deformation in such two cases are compared. So the influence of the non-linear factors on steel trussed arch bridge can be concluded, it can be used in the process of designing.