| ABSTRACT:Rigid-frame arch bridge is very popular around the construction departments.The structure form is simple and beautiful.Lightweight of the upper structure,economic and reasonable of material dosage and applicable to a variety of construction methods all lead to its development.In this paper,a rigid-frame arch bridge is taken as the background.Three finite element models of arch centering construction method,lifting pre-cast concrete construction method and the finished full-bridge are established.Comparative analysis of the two construction processes and a static analysis of the full-bridge bridge are taken in order to select a better construction methods based on reasonable structure stress and deflection.A full-arch bridge stability and local stability analysis of the foundation are made finally.Main research works of this dissertation are included below:Introduced the stress characteristics of the rigid-frame arch bridge and described the development of the domestic situation and the diversification of construction methods about the rigid-frame arch bridge;Presented the major joints and other parts design under the bridge design and the issue should be pay attention to;Calculated the forces of the control sections under different load conditions in order to provide a basis comprehensive analysis about construction optimization next;Analyzed the internal forces and deflections change process of control cross-sections under two construction programs——arch centering construction and precast concrete construction finite element models.Determined the better implementation plan after comparison of the data in integrated;Narrate the concept and classification of arch stability as well as the regular use of stability checking methods;According to the existing theory about the stability,the stability of the arch rib and the compressed bar were checked.At last,the theoretical calculation formula results and nonlinear analysis of all load cases under construction stage and finished stage are made. |
